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2010 Vol.8 No.5
Published 2010-10-31
Articles
1
JING Ge-；Jiao-Ju-Yang-；Li-Lin-Yo
Soil erosion amount and sediment delivery ratio in the hilly purple soil region in the upper reaches of Yangtze River:A case study in the Fujiang River Basin
Based on the analysis of the controlled area of hydrological stations,morphologic landscape and land use types in the Fujiang River Basin,the soil erosion amount of non-irrigated slope land,non-irrigated steep slope land,forest land,open forest land,grassland,shrub land and bare land were calculated.The annual erosion amount of the Fujiang River Basin was 2.46×107t/a,and annual erosion modulus was 813.9t/(km
2
·a).The annual erosion modulus in mountainous area in the upper reaches was more than 1000t/(km
2
·a),and in the hilly purple soil area was 500-800t/(km
2
·a).The average sediment delivery ratio of the Fujiang River Basin was 0.83,while in the upper reaches was 0.90 and in the hilly area in the middle and lower reaches ranged from 0.30 to 0.80.However,there was 1.44×106t/a sediment deposited in the alluvial and diluvial fan area.The sediment delivery ratio is not correlative with the river basin area,because which is not a influence factor but a units of measurement.
2010 Vol. 8 (5): 1-7 [
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2365
) [
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2007
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8
WANG Gao-；Wang-Wen-Long-；Jin-Jian-；Wang-Zhen-；Che-Xiao-Li-；Luo-Ting
Comparison study on hydrodynamic parameters of plant-covered road and earth-covered road on the Loess Plateau
The condition of road erosion was extremely serious on the Loess Plateau,which caused great inconvenience to the agricultural production and transportation.At present,the plant-covered road was the most effective and economical way to prevent the road erosion.The scouring experiments were conducted to contrastive analyze the relationships between soil detachment rate and hydrodynamic parameters of plant-covered road and earth-covered road.The results showed that with the range of slope gradient from 3° to 9°,compared to the earth-covered road,the soil detachment rate of the plant-covered road reduced by 64.68%;Significant correlation exits between soil detachment rate and the hydrodynamic parameters,and the flow power has the highest significant correlation with soil detachment rate;There was a power function relationship between the soil detachment rate and the flow shear stress,and there was a linear relationship between the soil detachment rate and the flow power,energy consumption of unit width;It had important significance to get a further analysis on the mechanism of erosion reduction of plant-covered road.
2010 Vol. 8 (5): 8-13 [
Abstract
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1605
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2361KB] (
1343
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14
GUO Xiao-Jun-；Wang-Dao-Jie-；Peng-Jian-Qi
Application of SCS model on simulation of the slope-runoff process in dry-hot valley
To study the rainfall-runoff mechanism in debris flow valley in dry-hot area,the experiments were carried out on red-yellow soil,which is the main type in dry-hot valley in northern Yunnan province.This paper identified the soil hydrological types of each runoff plot by outdoor infiltration experiment,classified the AMC(Antecedent Moisture Class) by antecedent impaction precipitation in the last five days instead of total precipitation,calculated the volume of surface runoff during 5 rainfalls in 2006 on 5 different kinds of land use types by SCS(Soil Conservation Service) model.The result is acceptable through calibrating
I
a
and
C
N
,The average error during each rainfall is respecrtively 4.32%,4.32%,9.73%,7.28%,6.24%.The result shows that the feasibility of the application of SCS model to estimate the volume of rainfall runoff in sloping field in dry-hot valley,and also provides a reference to study the rainfall-runoff model in this district.
2010 Vol. 8 (5): 14-18 [
Abstract
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1794
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1477KB] (
1456
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19
LIN Feng-；Chen-Ying-；Chen-Fen-；Chen-Xin-Wei
Influence of forest cover change on multiple-peaked storm flood process in Xixi watershed
A spatially distributed hydrologic model(HEC-HMS),was examined for its applicability in the Xixi watershed,a 1259km2 drainage basin in southeast China.The simulations were performed under designing flood events associated with different frequency to study the influence of forest cover changes on multiple-peaked storm flood process.The analysis shows that,along with the increase of forest coverage,the scenarios result in obvious decrease in peak discharge and volumes,and the sensitivity of hydrologic response to land use change tends to decrease as the frequency of the flood events increase.Furthermore,the influence of forest cover change on storm flood presented weakened with the rainfall intensity enhanced.
2010 Vol. 8 (5): 19-23 [
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1782
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24
TAN Zhen-Hua-；Wang-Tie-Li-；Tan-Xiao-；Liu-Dun-E-；Yuan-Yan-；Zhong-Han-Hui
Experimental study of rill runoff processes on loess hillslope
With multi-plot-based experiments of simulated rainfall and the addition of a steady in-flow at the top of the multi-plot system,the runoff processes of rill on loess hillslope are studied under five different rainfall intensities with same slope and five different slopes with same rainfall intensities.The main findings are as follows: 1) A power equation can be used to describe rill runoff rate changing with runoff process under different rainfall intensities.The overall trend for the three bigger rainfall intensities is a rise in the beginning and then goes to the relative stability,while it shows little change for the relatively smaller rainfall intensities with slightly rise later than the early.2) Changes in rill runoff rate with runoff process at different slopes behave in the same way as those under different rainfall intensities,with slightly rise later than the early,and also can be described by power equation.3) Rill runoff rate have the same trend of increasing firstly and stabilizing gradually with runoff processes under rainfall intensity and slope,but with the slope increase,the runoff rate increases more rapidly.4) Rill flow depth increases with rainfall intensity and slope,and logarithmic equation can be used for different rainfall intensities and different slopes,while a dual logarithmic equation,for the two factors.
2010 Vol. 8 (5): 24-29 [
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1698
) [
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1360
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30
MO Long-；Zhang-Xiao-Ping-；Chen-Feng-Juan-；Tun-Yan-；Fu-Yan-Ling-；Liu-Guo-Ban
Appraisal of land use suitability on the background of Grain for Green in the Loess Plateau:A case study in Majiagou Catchment of Ansai County
Land use suitability has a great impact on the ecosystem development and soil erosion of the Loess Plateau.Since the implementation of "Grain for Green" policy in 1999,the land use was expected to be more rational.This paper took the Majiagou Catchment of Ansai County in the Loess Plateau as example to appraise the land use suitability change over nearly 20 years.The factors influencing land fertility and moisture just like slope degree,soil erosion intensity and the position of landform were used to appraise the land use suitability.The results showed as follows: 1)The area of farmland decreased by 11.74% from 1990 to 2008;the area of woodland increased by 11.54% and the area of orchard increased by 1.82%.Land use type transferring mainly happened on the slopes greater than 15°.2) The land use rationality index of the catchment was calculated and found that from 1990 to 2008 this index was increased from 0.64 to 0.67.3) In 2008,the area of farmland,woodland and grassland were 21.17%,19.57%,56.62% in the catchment.The area of farmland with high suitability(suitability index A>0.8) and middle suitability(0.5≤A≤0.8) were respectively 1.31% and 21.27% of total farmland area.About 77.42% area of farmland was low suitable(A0.7),middle(0.5≤A≤0.7) and low suitability(A0.7) and middle(0.4≤A≤0.7) suitable levels was about 24.87% and 75.13% respectively.
2010 Vol. 8 (5): 30-35 [
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2223
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36
YANG Yong-Hui-；Tun-Pu-Te-；Wu-Ji-Cheng-；Huang-Tie-Bin-；Feng-Gao-；Guan-Xiu-Juan-；He-Fang
Effects of water-retaining agent on soil moisture,photosynthesis characteristics of
Triticum aestivum
L.
In order to investigate the characteristics of soil moisture,leaf relative water content(LEWC) and photosynthesis of
Triticum aestivum
L.in different growth stages,the field trial,which researched the effect of water-retaining agent(WRA)(0,30,60,90kg/hm
2
) on soil moisture,leaf relative water content and photosynthetic characteristics,was carried out.The results indicated that 1) soil moisture in 0-20cm deep soil increased obviously from returning green stage to booting stage with the increase of the WRA.Meanwhile,the WRA added soil moisture in 20-40cm deep soil in different growth stages of
Triticum aestivum
L.and soil moisture were as follows: 60kg/hm
2
> 90kg/hm
2
> 30kg/hm
2
> CK(0kg/hm
2
).2) LEWC indicated that at jointing stage,LEWC decreased with the increase of the WRA but evidently higher than CK,while was were no difference between 90kg/hm
2
and 30kg/hm
2
of the WRA.At booting stage,LEWC of 90kg/hm
2
was highest compared with other treatments and that of CK was lowest.At grain-filling stage,there was no difference remarkably between the treatments of the WRA but evidently higher than CK.3) Photosynthetic characteristics of
Triticum aestivum
L.in different growth stages were as follows: photosynthetic rate,transpiration rate and leaf water use efficiency were relatively highest under the 60kg/hm
2
of water-retaining agent compared with other treatments of the WRA,while that of 30kg/hm
2
and 90kg/hm
2
were different but higher than CK.In all,the WRA significantly increased soil moisture,leaf water potential,photosynthetic rate,transpiration rate and leaf water use efficiency and its suitable or recommended dosage was 60kg/hm
2
.
2010 Vol. 8 (5): 36-41 [
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1809
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42
LIU Cai-Feng-；Zhang-Zhi-Jiang-；Guo-Jun-Ting-；Cha-Tong-Gang-；Sun-Jian-Xin
Transpiration of a
Pinus tabulaeformis
and
Robinia pseudoacacia
mixed forest in Hilly-gully region of the Loess Plateau,West Shanxi Province
Understanding of the relations between plant and water is the key to successfully implement protective afforestation programs in the Hilly-gully region of the Loess Plateau,West Shanxi Province.Our study measured sap flow of 17 trees covering 4 diameter classes in a 16 years old
Pinus tabulaeformis
and
Robinia pseudoacacia
mixed forest stand from July to October in 2008 using Thermal Dissipation Probe(TDP) in Caijiachuan watershed in Jixian County,Shanxi Province.At same time,we also measured the changes of environmental factors.The diurnal fluctuation of sap flow velocity of
Pinus tabulaeformis
and
Robinia pseudoacacia
was experienced a significant difference in the starting time,time to peak,dramatic decreasing time,and lasting time duration of sap fow velocity.The diurnal transpiration rate increased against the diameter of breast height except for 6 and 12cm pine trees.We found that the solar radiation and vapor pressure deficit were the major factors to control the canopy transpiration of
Pinus tabulaeformis
and
Robinia pseudoacacia
.In addition,monthly stand transpiration scaled up from sapwood area were 30.8mm,24.1mm,26.3mm,and 18.4mm for July,August,September,and October,2008,respectively.The total transpiration amount during this four months period was less than the total rainfall amount during the same time.
2010 Vol. 8 (5): 42-48 [
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1937
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1202
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49
ZHANG Ying
Forest accounting model and its optimal forest land prices in China
In order to better carry out the management of forest resources and serve the decision-making process for forest management,this paper has established the accounting model of forest land,and calculated the optimal forest land prices based on the collected data of forest area,afforestation area,forest disaster areas such as forest fires,forest pest and disease area etc.from 1990 to 2007 in China according to the theory of economic cybernetics.The results showed that the regression goodness of fit
R
2
=0.916 for afforestation area
A
(
k
) and forest area
L
(
k
),and the regression coefficient
R
2
=0.958 for forest disaster areas
C
(
k
)、forest area
L
(
k
) and forest logging area
F
(
k
) in accounting models of forest land,and the
R
2
=0.998 for forest area
L
(
k
) and forest logging area
F
(
k
) in regression models,the whole coefficients have statistical significance in those models.Further more,this paper calculated the optimal price of forest land in China were 0.976×104 yuan /hm
2
currently based on above accounting models.Finally,the paper also discussed on the forest resources accounting issues,and pointed out that the current accounting does not taking account of the optimal price of forest land,the feasibility of policy control and the characteristics of the forest and so on,with the result that the accounting prices for forest land are quite difference,and the accounting results are not scientific and reasonable.The paper proposed that to establish China's forest accounting model,and strengthen basic statistics on forest accounting data,as well as to calculate the optimal price of forest resources accounting in China.
2010 Vol. 8 (5): 49-54 [
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] (
1893
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1764KB] (
1305
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55
LI An-Ding-；Li-Wei-Ji-；Yang-Rui-；Yu-Li-Fei
Capacity of soil moisture conservation of different microhabitats under different mulching techniques in karst area
In this paper,the capacity of soil moisture conservation of different microhabitats under different mulching technology in Huajiang karst typical valley area was studied.The results showed that the soil moisture change of soil surface,stone gully and stone pit is almost same by litter mulching,stone mulching and plastic mulching,among which the stone pit has the highest soil moisture content,while the soil surface is the lowest.The soil moisture content of all soil layers were increased,but the increasing extent was different.A frequency of the water stress was decreased in a year.Effects of soil moisture conservation is better,and daily average soil water loss is less under different mulching,among which plastic mulching is best,while that of litter mulching and stone mulching were followed.But by afforestation on the spot,the results showed that the survival rate of litter mulching and stone mulching is higher than that of plastic mulching.So afforestation under plastic mulching should be further studied in karst typical valley area.
2010 Vol. 8 (5): 55-60 [
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1851
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1896KB] (
1466
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61
DIAO Yong-；Chen-Zhen-；Fan-Wei-；Wang-Qian-；Yang-Chi-Tian
Water utilization characteristics of 7 typical plant species in hilly region of Taihang Mountains
To evaluate the environment adaptability of plants,using the Li-6400 photosynthesis measuring system and Ci-203 LAI measurement instrument,we measured the indexes such as daily process of transpiration rate,photosynthesis rate and water utilization efficiency of 7 typical plant species in hilly region,Taihang Mountains in order to study the characteristics of the water utilization.The results show that: 1) The daily process of transpiration rate had single peak for 5 species,
Rhus typhina
,
Platycladus orientalis
,
Robinia pseudoacacia
,
Vitex negundo
,
Ziziphus jujube
,and double peak for 2 plant species,
Quercus variabilis
and
Pistacia chinensis
.The doublet is related to plants' siesta,which shows its initiative adaption to high temperature and drought.The correlation analysis showed that between the photosynthesis rate and transpiration rate there is a firm relationship for 7 species,and for the shrub,a significant one.2) The
W
UE
(water utilization efficiencies) were significantly different among 7 plant species,meanwhile the
Robinia pseudoacacia
has a higher value.The descending order of the average
W
UE
value was Robinia pseudoacacia,
Ziziphus jujube
,
Quercus variabilis
,
Pistacia chinensis
,
Vitex negundo
,
Rhus typhina
,
Platycladus orientalis
,as for water consumption per hectare,was
Quercus variabilis
,
Rhus typhina
,
Platycladus orientalis
,
Pistacia chinensis
,
Robinia pseudoacacia
,
Vitex negundo
,
Ziziphus jujube
.3) According to water consumption and water utilization efficiency the tested plants could be divided into 3 types:
Quercus variabilis
and
Ziziphus jujube
,belongs to higher water consumption and water utilization efficiency type,
Platycladus orientalis
,the lower water consumption and water utilization efficiency type;as for
Robinia pseudoacacia
,the lower water consumption and high water utilization efficiency type,which showed the greatest advantage in water competition among 7 species.
2010 Vol. 8 (5): 61-66 [
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1868
) [
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2148KB] (
1373
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67
DIAO Fang-Ying-；Cheng-Xiao-Qin-；Wei-Dong-；Li-Lin-Yang
Interspecific relationship of the main native plants along the mountain roads in Yanqing County,Beijing
The interspecific association and correlation of 40 native plants along the mountain roads in Yanqing County,Beijing were analyzed by using a series of parameters including variance ratio,Fisher's exact test for a 2×2 contingency table,Person's correlation coefficient and Spearman's rank correlation coefficient.The results showed that the correlations in the 40 native plants were extremely significantly positive and correlations became stages with benefiting each other.Fisher's exact test were applied to test for association between species,while the numerical changes between pair-species reflected more precisely by using Spearman's rank correlation coefficient than Pearson's correlation coefficient.Positive association coefficient s of 61 species-pairs for Spearman's rank correlation coefficient were either significant(
P
<0.05) or highly significant(
P
<0.01) and negative association coefficients were significant or highly significant in 12 other species-pairs.The 40 native plants were classified into 3 ecological species groups according to the result of Spearman's rank correlation coefficient.The result of ecological species group reflected the same or different adaptability to environment of native species,and the internal relations of interspecific relationship.
2010 Vol. 8 (5): 67-71 [
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1668
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1604KB] (
1451
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72
WANG Hui-Li-；Tang-Yu-Gui-；Hui-Jiao-Mei
Effects of reconstruction of low-benefit stands on the soil physical and chemical properties and water conservation function
Soil physical and chemical properties and water conservation function of five forest stands was investigated in Changwu County,Guangxi Province,including two low-benefit stands(
Pinus massoniana
stand and
Pinus elliottii
stand),and three reformed mixed stands(mixed stand of
Pinus massoniana
and
Schima superba
,mixed stand of
Pinus elliottii
and
Schima superba
,mixed stand of
Pinus elliottii
and
Castanopsis fissa
).The results show as the follows: 1) Compared with low-benefit stands,reformed mixed stands show a significant increase in soil mineral elements contents and physical properties.2) The water status and soil percolation capacity have a significant increase in reformed mixed stands than that in low-benefit stands.3) Compared with
Pinus massoniana
stand(2166t/hm
2
) and
Pinus elliottii
stand(2075t/hm
2
),there are significant improvement in water conservation function in reformed mixed stands.The water storage amount of mixed stand of
Pinus massoniana
and
Schima superba
is 2543t/hm
2
,2506t/hm
2
in the mixed stand of
Pinus elliottii
and
Schima superba
,and 2483t/hm
2
in the mixed stand of
Pinus elliottii
and
Castanopsis fissa
.4) Magnitude of the increases of soil physical and chemical properties vary with soil depth,being larger in the 0-20cm layer than 20-40cm layer.Soil nutrition,physical properties and water conservation function are significantly improved in three reformed mixed stands.It is one of the effective measures to reconstruction for low-benefit stands that
Schima superba
or
Castanopsis fissa
is planted in low-benefit stands.
2010 Vol. 8 (5): 72-78 [
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] (
2072
) [
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2876KB] (
1889
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79
LAN Gan-；Zhang-Bin-Ji-；Wang-Liu-Jun-；Xu-Xiao-Niu
Stand structure and soil characteristics in a deciduous broadleaved forest in Langyashan Forest Park,Anhui
A typical deciduous broadleaved forest in Langyashan Forest Park was studied and every tree in sample was surveyed.Regeneration characteristics and soil properties were investigated.The results showed that a total of 8 tree species(diameter at breast height≥3.0cm) which belonged to 7 families and 9 genii were recorded within 4 sampling plots.
Aceraceae
and
Ulmaceae
were dominant families in this forest type.The vertical structure of the forest was simple without obvious shrub and herb layers.In the arbor layer,
Acer mono
,
Zelkova chneideriana
and
Platycarya strobilacea
were the dominant tree species with absolute dominance.Tree species diversity was relatively low in this deciduous broadleaved forest.The characteristics of soils under this forest demonstrated that the concentrations of organic matter,available P and K were relatively high with a high EC and weak acidity.However,the soil depth in sites was shallow with a high content of rock fragments,which could be the major control for the low tree species diversity.TN、pH(H
2
O) and available N are the mostly factors affecting on the growth of tree in different population structures.This results would provide a scientific base for Langyashan forest regeneration and sustainable forest management.
2010 Vol. 8 (5): 79-85 [
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1819
) [
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1893KB] (
1394
)
86
LI Gong-Li-；Ding-Guo-Dong-；Dong-Zhi-；Liu-Yu-Chao-；Diao-Ming-Pan
Site classification and vegetation restoration technigue of coastal saline land in the Zhongjie farm
In order to guiding vegetation restoration suited to coastal saline land,45 plots of the Zhongjie farm were selected for field investigation,laboratory analysis testing and factor analysis methods,by which soil type,soil salinity,groundwater levels,distance from the sea,salt type,soil texture,soil compaction,soil organic matter,porosity,pH and altitude were analyzed.The results showed: soil formation factors,soil type and soil salinity were key factors to affect on site classification of coastal saline land.The descending order of variables contribution rate to classifaction were distance from the sea,groundwater levels,soil type,soil texture,altitude,salt type,soil salinity,pH.Three categories of site types including coastal salinized moisture soil,coastal salinized meadow soil and saline soil,and 11 categories of site subtypes were classfied,and the corresponding vegetation restoration technigue was put forward.It may provide a theoretical basis for the restoration of vegetation on saline-alkali land in the Zhongjie farm.
2010 Vol. 8 (5): 86-91 [
Abstract
] (
2488
) [
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1840KB] (
1632
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92
LI Yan-；Wang-An-Lei-；Yang-Chi-Tian-；He-Li-Na-；Tao-Xiao-You-；Zuo-Pu-Xuan-Hang
Evaluation of environment quality based on the analysis of environmental vulnerability and degradation driving force
Based on the different natural and social conditions of Funiu Mountain area of Huai River Basin,we constructed the environmental quality evaluation indicators using county-level administrative divisions as the evaluation unit,made a comprehensive environmental vulnerability assessment of environment to the whole region by analytic hierarchy process,and degradation driving force assessment by principal component analysis based on the same indicators.The results showed that the excessive,strong and medium vulnerable regions occupied more than half of the study area,mainly located in central and eastern regions,and the light and slight vulnerable regions mainly located in western and southern mountains.There were six prominent driving forces affectting the environmental vulnerability of this area: excessive land reclamation,soil bulk density and thickness of litter,precipitation,agricultural development and industrial levels,topography and vegetation cover,cultural qualities of the situation.
2010 Vol. 8 (5): 92-97 [
Abstract
] (
1598
) [
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1KB] [
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1924KB] (
1154
)
98
DIAO Yun-Jie-；Yang-Dan-Jing-；Mao-Fei
Impacts of land use change on land degradation risk in He-Bao-Pian mining area of northwestern Shanxi Province
Land degradation risk has a close relation to land use types,land-use change will inevitably have potential impacts on land degradation.Here a surface cover index based on spectral mix analysis(SMA) is used to evaluate potential land degradation risk in He-Bao-Pian mining area of northwestern Shanxi Province during 1990—2006,and the impacts of land-use change on land are analyzed.The results show that the overall trend of land degradation risk is decreasing during the study period,the main reasons may be wasteland development and implementation of related ecological construction projects such as Grain for Green project.Coal mining generally has negative impacts on land degradation,however they are mostly offset by the land-use change caused by the development of mining industry and a series of ecological construction project in the study area.
2010 Vol. 8 (5): 98-103 [
Abstract
] (
2564
) [
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2381KB] (
1541
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104
ZHANG Yan-Juan-；Zhang-Hong-Chao-；Xu-Xiang-Zhou-；Hu-Jin-Song
Experimental study on physical properties of the permeable concrete brick made by cool isostatic pressing technology
Pervious surfaces could decrease the urban storm peak,conserve rainfall in the underground,and reduce the high air temperature of city.This paper designs four kinds of permeable bricks with different porosities and water cement ratios,which is decided through the volume method.After mixing and isostatic pressing,we measure the porosity,compressive properties and permeability coefficient of the samples,and calculate the cost of brick which has the highest permeability coefficient.The results show that: 1) The permeability coefficients of all samples reach 1.18-1.60mm/s and compressive properties of that exceed 30MPa.2) The volume method is logical and feasible.3) The cost of the new permeable brick is only 28.25 yuan/m
2
if 20% of the total cement was replaced by the mixture of 15% fly ash and 5% silica fume.
2010 Vol. 8 (5): 104-108 [
Abstract
] (
1885
) [
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1381KB] (
1271
)
109
CA Ben-Jiu-；Xin-Guo-Hui-；Zhang-Yang-Wu-；Dai-Xiao-Xuan-；Liu-Bin
Characteristic of soil organic carbon of the Sphagnum spp. wetland in Xiao Hinggan Mountains
In the Wuyiling National wetland Nature Reserve of the Xiao Hinggan Mountains forest region,the soil samples of typical
Sphagnum
spp.wetland collected.According to the content of soil organic carbon(SOC),carbon density,carbon reserve,and the relationships between the SOC and the soil physical and chemical properties were analyzed.The results showed that the contents of SOC showed a reduction in a deeper soil stratum which range from 433.89 to 523.36g/kg,and is in a mean content of 474.27g/kg;carbon densities rise in a deeper soil stratum with a soil carbon density of 166.07t/hm
2
in the depth of 0-60cm.Secondly,the relation between SOC and soil capillary porosity was significant negative,quadratic curve-fitting results of which was well(R
2
=0.87);the SOC content is obviously negative correlated with soil bulk density,and the linear equation fitted was well(R
2
=0.81).The soil organic carbon content were significant negative correlation with total nitrogen and total phosphorus,in a obvious positive correlation with effective phosphorus,And organic carbon and hydrolysis nitrogen were not significantly correlated.The results may help us for further study.on wetland soil carbon storage and carbon cycle.
2010 Vol. 8 (5): 109-113 [
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2150
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1990KB] (
1310
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114
WANG Bao-Xia-；Ceng-Cong-Cheng-；Chen-Dan-；Wang-Wei-Ai-；Zhang-Lin-Hai
Effects of
Spartina alterniflora
invasion on soil organic carbon in the
Phragmites australis
estuary wetlands of Minjiang River
Shanyutan Wetland is the largest estuarine wetland in the Minjiang River estuary area.Soil samples of
Phragmites australis
and Spartina alterniflora in the Shanyutan Wetland were collected.The soil organic carbon contents,storages in the soil profiles and impact factor were measured and studied.The results indicated that the mean value of soil organic carbon content in rhizospheric soil(0 to 60cm) under
Phragmites australis
and
Spartina alterniflora
were 15.54 and 17.16g/kg respectively and the organic carbon content in the surface(0-10cm)were the highest,19.69 and 22.02g/kg respectively.The total value of organic carbon storages in rhizospheric soil(0 to 60cm) under
Phragmites australis
and
Spartina alterniflora
were 6794.20 and 8231.48t/km2 respectively.The organic carbon storages in the soil layer of 30-40cm under
Phragmites australis
is the highest,while the highest value of that under
Spartina alterniflora
emerges in the soil layer of 0-10cm. The invasion of
Spartina alterniflora
had increased rhizospheric soil organic carbon contents and storages of the wetland of indigenous
Phragmites australis
.The rhizospheric soil organic carbon content had a significant positive relationship with the moisture content and soil salinity.Considering the invasion of
Spartina alterniflora
,the author give some suggetions for the management of estuary wetlands of Minjiang River.
2010 Vol. 8 (5): 114-118 [
Abstract
] (
2030
) [
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1KB] [
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1726KB] (
1362
)
119
GENG Feng-Yuan-；Wang-Ke-Qi-；Yang-Chao-Bing-；Chen-Zhi-Zhong-；Kang-Long
Observation on soil and water conservation benefit of horizontal stage
Based on the observation of runoff plots on sloping land in Muyang river middle stream of Songhuaba Reservoir in Kunming,the runoff amount,soil loss amount,output concentrations and output of the total nitrogen and total phosphorus in runoff plots were investigated.The results indicated that compared with the control study,runoff amount reduced 34.14%,soil loss amount reduced 57.17%,total Nitrogen and total Phosphorus output reduced 33.32% and 33.82% respectively, from plot under horizontal stage.The construction of horizontal stage on sloping land played a more obvious effect on soil and water conservation and fertilizer conservation,and it had a great significance for controlling the non-point source pollution matter.
2010 Vol. 8 (5): 119-124 [
Abstract
] (
1521
) [
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1KB] [
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1915KB] (
1390
)
