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2009 Vol.7 No.5
Published 2009-10-31
Articles
1
LI Dui-；Shang-Guan-Zhou-Beng-；Liu-Bao-Yuan-；Zheng-Fen-Chi-；Yang-Qi-Ke
Advances of soil erosion research during the past 60 years in China
Based on the summarization of the advances of soil erosion research in China during the past 60 years,this paper introduced mainly the great significance achievements of soil erosion research on five aspects such as the temporal and spatial characteristics of national soil erosion dynamics,the soil erosion process,models and its control mechanism,the source of coarse sendment of Yellow River,the mechanism of wind erosion and desertification control,erosion environment evolution and control,and pointed out the three areas in soil erosion research in China which need to be strengthened.
2009 Vol. 7 (5): 1-6 [
Abstract
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1424
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7
CUI Feng
Advances in debris flow prevention in China
Since 1950s China has devoted to the studies of debris flow,beginning with the investigation of debris flows along the major traffic lines and in the typical regions in the southwest,including the on site observations in the Jiangjiagou Gully,Yunnan;Guxiang Gully,Tibet;Huoshao Gully,Gansu;and other valleys.Large-scale laboratories were set up in the Southwest Institute of Railway Science and the Institute of Mountain Hazard and Environment.A set of monitoring equipments and alarming instruments have been developed to meet the need in mountain constructions and residential areas protection.Forecasting models have been proposed for individual valleys and regional debris flows,in cooperation with the weather forecast.Various models have been built for hazard and risk assessment, with the concepts of risk analysis and management.An integrated system incorporating geotechnical and botanical engineering has been developed and applied to the prevention projects in cities and towns,farmlands,mines,and scenery spots.Numerous engineering structures have been built.The potentiality of debris flow is increasing in China along with the mountainous development.This requires further researches in the fundamental theories,development of forecast models based on the genesis of debris flow,improvement of determination of engineering parameters,and optimization of the structure design.Furthermore,attentions should be paid to the risk analysis and forecast in the earthquake area,as well as the exploitation of the resources from debris flows.
2009 Vol. 7 (5): 7-13 [
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1664
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1835
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14
YANG Wei-Xi
Desertification combating during the past 60 years in China
Based on the development of desertification combating during the past 60 years in China,the author classified it in three periods: from 1949 to mid-1970's,from mid-1970's to late 1990's and in the begining of 21 century.The author summarized and reviewed the courses of desertification combating by periods in China relating to environmental background,desertification combating activities,and achievements.Opinions on some social concerned or disputed issues also are put forward.
2009 Vol. 7 (5): 14-18 [
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1344
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19
GUO Suo-Pan-；Li-Zhi-An
Development and achievements of soil and water conservation monitoring in China
As a very important task for the foundation of soil and water conservation,the monitoring is developing with the practice of soil and water conservation,and it promotes the development of soil and water conservation for the most part.With the beginning of the field observations of runoff and sediment and the monitoring of soil and water losses of small watershed in the 1920's,comprehensive experimental stations began to develop,and they made an important contribution to monitoring research,demonstration,promotion,etc.Dynamic monitoring and forecasting on regional soil and water losses provided important basis for national ecological construction planning,ecological protection planning and soil and water conservation.With the continuous finding of monitoring laws and regulations, soil and water conservation monitoring has maintained healthy development.The national soil and water conservation monitoring network provided basic security for dynamic monitoring and proclamation.With constantly enrichment and improvement of the soil and water conservation basic database and application system,the level of modernization of the planning and design,project management,public service management and information services have been greatly enhanced.
2009 Vol. 7 (5): 19-24 [
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1435
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25
ZHENG Fen-Chi-；Wang-Jian-Xun-；X.C.JohnZhang；Li-Zhi
Climate change prediction in the future 40 years of the Hilly-gully region of Loess Plateau based on CLIGEN and GCM models:A case study in Ansai experimental station
The study of climate change is significant for preventing regional floods and droughts.In order to predict potential impacts of climate change in the future 40 years at the Hilly-gully region of Loess Plateau under three emission scenarios of A2,B2,and GGa1,observed climate data from 1986 to 2003 in Ansai Experimental Station and downloaded GCM(HadCM3)grid data during 1986 to 2049 were used,based on spatial and temporal downscaling.Climate change in the future 40 years at the Hilly-gully region of Loess Plateau was predicted by CLIGEN and GCM models.The results show that average annual precipitation in 2049 under A2,B2,and GGa1 emission scenarios increases by 37%,22%,and 12%,respectively;maximum monthly rainfall occurs in summer under three emission scenarios.Monthly minimal temperature and maximal temperature all rise up in 2049 under three emission scenarios and difference in temperature increment among three emission scenarios is not significant.Annual minimal temperature and annual maximal temperature rise in 1.41-1.56 ℃ and 0.92-1.57 ℃,respectively.
2009 Vol. 7 (5): 25-31 [
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1880
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32
WEN Feng-；Kuang-Chang-Fu-；Gu-Ang-Wen
Risk analysis of governmental investment of soil and water conservation project
Based on theory of investment risk assessment,identification systems of investment risk have been studied combined with characteristics of governmental soil and water conservation investment in this paper.On the basis of structure decomposition of investment risk in the whole project,analysis method of Monte Carlo simulation for soil and water conservation investment risk has been put forward.A soil and water conservation project has been taken for case study and relative datum have been calculated,in which the expected results have been obtained.It has been demonstrated that the method this paper raised is suitable for analyzing governmental soil and water conservation project investment risk.
2009 Vol. 7 (5): 32-36 [
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1346
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37
MU Xin-Min-；Gao-Feng-；Wang-Shuang-Yin-；Zhang-Xiao-Ping-；Wang-Fei
Evolution of the relationship between soil and water loss and human activities in modern times in Northeast China
By human excessive reclamation of land and unreasonable farming,regional soil and water loss is becoming a constraint factor in sustainable use of arable land and food production in Northeast China.In this study,based on discrimination and select of historical data,the relationship between population,landuse changes and soil and water loss in Northeast China from 1840 up to now is analyzed.The results show that: When the population density up to 60—70 people per square kilometer,along with lifestyle changes,application of mechanization technology,the forest coverage dropped to 30%,and reclamation rate reach to 30%,which makes an increasingly serious problem of regional soil erosion in Northeast China.
2009 Vol. 7 (5): 37-42 [
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1709
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43
TUN Chang-Wen-；Wang-Yong-Chi-；Fu-Ai-Feng-；Wang-He-Li
Restoration technique of vegetation in the water-level-fluctuating zone of suburban reservoirs in Shenzhen
The water-level-fluctuating zone(WLFZ) of suburban reservoir should not only protect the water resources,but also meet the requirements of the ecological landscape.Based on the monographic study on Shenzhen's water conservation forest and the result of the screening test of the suitable plants for the WLFZ,this paper proposes the technical system of vegetation restoration in the WLFZ of reservoirs.Trees and herbaceous vegetation cultivated in normal water level line downward 3m,herbaceous vegetation cultivated in normal water level line downward 3-6 m,simultaneously a combination of the biological drainage ditch,the reverse terrace & the reverse scale pit with eco-bag and other auxiliary engineering measures may provide ways for ecological reconstruction of the WLFZ of reservoirs.
2009 Vol. 7 (5): 43-47 [
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1568
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48
YANG Chi-Tian-；He-Li-Na-；Diao-Ning-；Shu-Gong-Mei-；Duan-Yu-Ling
Differences of root growth and morphology of seed-base seedling and container seedling
In order to find out the relationship between the method of seedling culture and root development,we presented two methods for seedling breeding,i.e.Seed-base and container.Based on the seedlings of
Platycladus orientalis
,Robinia
pseudoacacia
and 3Ulmus
pumila
in the experiment,we found out that because of the effect of root air-cutting,seed-base check the taproot growth of
P
.orientalis and
U
.
pumila
,and promote that of
R
.
pseudoacacia
.Seed-base can boost taproot growth towards the gravity direction,and appear a performance of vertical upgrowth taproot and sturdy and evenly distributed lateral root. On the other hand,taproot is not evident and root swirlling is serious in container seedling.
P
.orientalis and
U
.
pumila
seed-base seedling has a 181.8% and 128.6% greater number of first-order lateral root respectively than that of container seedling,and the diameter of first-order lateral root of
U
.
pumila
is also stimulated by seed-base.For all three species,first-order lateral roots of seed-base seedling distribute evenly in the four parts of 12,2-3,3-4 and 4-5 cm,however,that of of container seedling distribute only in the parts of 1-2 and 2-3 cm.Seed-base stimulate the number of first-order lateral root and ensure its even distribution,which will play an important role in enhancing the root absorbency and the soil conservation function.
2009 Vol. 7 (5): 48-51 [
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52
YANG Hui-Ling-；Gao-Feng-；Wang-Hua-Wei-；Ding-Fu-Dun-；Dai-Wu-Gang
Characteristics of soil particles fractal dimension under different forest stands of the ecological restoration area in Dahei Mountain area
In order to evaluate the effect of the ecological restoration on soil structure and function,characteristics of soil particles fractal under 6 typical vegetations of the ecological restoration area in Dahei Mountain area were studied according the quality principle of soil particle size distribution and theories of soil fractal.The results showed that:1)The soil particle size distribution of the different vegetation types varied greatly,the contents of soil clay and silt under woodland were 87.47% and 89.94% higher than that of grassland;sand and fine gravel content and coarse gravel content of woodland are lower 25.09% and 19.19% than that of grassland;in the various forest vegetation types,soil clay and silt content of natural forest such as
Betula davurica
Pall+
Populus davidiana
mixed,
Quercus mongolicus
Fisch and
Ulmus macrocarpa
are significantly higher than that of artificial forest such as
Prunns mandshurica
and
Pinus tabulaeformis
Carr.2)Soil particles fractal dimension of woodland is significantly higher than that of grassland,and natural forest is higher than that of artificial forest,and to the greatest is secondary natural mixed.3)The soil particles fractal dimension of the different vegetation types has a significant linear positive correlation to the clay content of soil particle size <0.05 mm and the silt content of soil particle size 0.05～0.25 mm.The soil particle is smaller,the higher the fine-grained concentration,the greater the fractal dimension.4)The soil particle fractal dimension of the different vegetation types had a significant negative linear correlation with soil uneven coefficient.Along with the lower soil uneven coefficient,fractal dimension of soil particle was increased.In addition to grassland,the other five typical forest stands are good structural soils in soil uneven coefficient.Soil particle distribution of natural forest is better,particularly,the secondary natural mixed the best,artificial forest is next-best.
2009 Vol. 7 (5): 52-57 [
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58
WU Chun-Pan-；Diao-Yu-Sen-；Xin-Ying-；Kong-Xiang-Fei-；Li-Zhi-Fei
Effects of structure of the Larix gmelini plantation on soil-hydrology characteristic
This paper aimed at studying the effects of structure of Larix gmelini plantation on soil-hydrology characteristics.Soil physical properties, soil water storage capacity,and permeability were analysed within different structural types of Larix gmelini plantation,located in Maoershan of Shangzhi City,Heilongjiang Province.The results showed that: 1)The descending order of the means of soil bulk density was: uniform structure,six-line structure,four-line structure,two-line structure,respectively.And the means of soil bulk dentisty were 1.33,1.22,1.19 and 1.10 g/cm
3
, respectively.The trend of total porosity was opposite to that of soil bulk density.The values of total porosity of four Larix gmelini plantations were 26.36%,48.99%,54.49% and 56.00%,respectively.2)The range of initial soil permeability was 1.20-2.27 mm/min.Additionally,the descending order of infiltration coefficient
K
10
at 10 ℃ was two-line structure(1.04 mm/min),four-line structure(0.81 mm/min),six-line structure(0.67 mm/min),uniform structure(0.61 mm/min),the tendency of the 30 min infiltration accumulation was the same as that of
K
10
.3) Within the range of 40 cm soil depth,the volume of saturated water was between 1 054.20-2 239.80 t/hm
2
,that of two-line structure is maximum.In conclusion,the soil hydrology effectiveness of Larix gmelini plantation with two-line structure was higher compared to other structure types.Therefore,it is an optimum method to construct Larix gmelini plantation.
2009 Vol. 7 (5): 58-62 [
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1485
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63
LI Wen-Ying-；Man-Xiu-Ling-；Zhang-Yang-Wu
Soil properties and water conservation function of <i>Betula platyphylla</i> secondary forest with different stand ages
Soil characteristics,water holding capacity of litter and soil water storage properties of four different ages of
Betula platyphylla
secondary forest in Xiaoxing'an Mountain were analyzed.The results showed that: the volume and maximum water holding capacity of litter in 38 years old of
Betula platyphylla
secondary forest were biggest,while that in 70 years old were lower,relatively. There were significant positive correlation between the volume and maximum water holding capacity of litter.And the non-capillary porosity was fluctuating changes with ages.It was beneficial to rainfall infiltration through the 0-30 cm soil layer in 38 years old of the
Betula platyphylla
secondary forest,while that in 25 years old with the smallest non-capillary porosity is not beneficial to rainfall infiltration according to the soil bulk density and non-capillary characteristics analysis.Based on the investigated data,the decreasing order of soil water conservation function of the four ages of the
Betula platyphylla
secondary forest was 70 a(3 628.445 t/hm
2
),56 a(3 524.015 t/hm
2
),25 a(3 433.626 t/hm
2
),38 a(3 275.820 t/hm
2
).
2009 Vol. 7 (5): 63-69 [
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70
YANG Yong-Hui-；Wu-Ji-Cheng-；Tun-Pu-Te-；Diao-Shi-Wei-；He-Fang-；Shi-Fu-Gang
Effect mechanism of straw mulching and water-retaining agent on soil structure,evaporation,and infiltration process
Based on the application of water-retaining agent,straw mulching,and irrigation,investigating soil structure characteristics,the mechanism of evaporation and infiltration process are studied.The results show that: different measures of water-retaining increase the content of soil organic matter,reduce soil bulk density,improve the stability of soil structure,reduce fractal dimension of soil aggregates,decrease soil evaporation,and improve the infiltration capacity.Regression equation of soil infiltration rate follows y=a+be
-cx
. The change of infiltration rate follows the change of value
a
;The decrease rate of infiltration is determined by the value
c
.Through the lifecycle of
Triticum aestivum
L.,compared with the treatments of irrigation,the application of water-retaining agent in the treatments of no-irrigation increase soil structure stability,infiltration amount,reduce soil evaporation.On harvested maize plots under non-tillage the content of soil organic matter was increased significantly,the soil moisture-stable aggregates and soil infiltration properties were improved,and evaporation was reduced compared with CK.
2009 Vol. 7 (5): 70-75 [
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1705
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76
ZHANG Yi-Wang-；Liu-Wen-Zhao
Effects of supplemental irrigation and different nitrogen and phosphorus rates on yield and water use efficiency of <i>Triticum aestivum</i> L. on Loess Tableland
Effects of supplemental irrigation and different nitrogen and phosphorus rates on crop yield,soil water content,and water use efficiency of
Triticum aestivum
L.were studied by using a randomized complete block split plot design.Results indicated that soil water consumption depth increased along with wheat growing stages,which went down to 1.2 and 2.2 m during pre-wintering stage and booting stage respectively.Soil water content for different treatments had no significant difference in initial stages,however,after booting stage,soil water content for the treatments of different nitrogen and phosphorus rates were significantly lower than that for non-fertilization application.Soil water content for rain-fed and supplemental irrigation treatments had no significant difference.Both supplemental irrigation and different nitrogen and phosphorus rates treatments increased crop yields and significantly increased soil water consumption.Supplemental irrigation increased crop yields,but had no significant difference than rain-fed treatment,however,the nitrogen and phosphorus application treatment increased crop yields from 134% to 240% more than non-fertilization application treatment.Application of different nitrogen and phosphorus ratessignificantly increased water use efficiency of
Triticum aestivum
L..Howerver,supplemental irrigation decreased water use efficiency from 3% to 30%,which had no significant difference statistically.The different nitrogen and phosphorus rates treatments significantly improved crop yield compared with supplemental irrigation.Supplemental irrigation and the treatment of high nitrogen and high phosphorus rate significantly increased crop yield and gave higher water use efficiency.
2009 Vol. 7 (5): 76-81 [
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1518
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1318
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82
DONG Zhi-；Gu-Zhi-Jun-；Li-Gong-Li-；Juan-Bao-Yan
Soil erosion characteristics and vegetative restoration measures in the construction area of wind power field in Bashang region of Hebei Province
Based on project region of wind power field in Bashang,the soil erosion characteristics,zoning,key protection area and vegetative restoration measures are studied.The results show that: the soil erosion of wind power field construction region is intercoupling with particularity of wind power field and characteristics of soil erosion of Bashang region.The erosion characteristics of wind power field in construction region is coexistence of wind erosion with water erosion,coexistence of point erosion with line erosion,and vegetation restoration is difficult,earthwork and waste slag are less.Soil erosion are mainly occurred in six regions which is road,fans area,working and living region,substations,overhead line area and abandoned dreg site.The erosion characteristics and controlling emphasis are different in regions.The vegetation restoration can be resumed with three kinds measures including fence closing,using of soil seed bank to restoration natural plant,and constructing artificial vegetation in wind power field construction area of Bashang region.
2009 Vol. 7 (5): 82-86 [
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1726
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1275
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87
HUANG Yun-Feng
Comparative study on community characteristics of
Quercus phillyraerides
A. Gray between scenic spot and nature reserve
In order to evaluate the living conditions and propose the protection strategy of Quercus phillyraerides A.Gray communities,the characteristics of Quercus phillyraerides A.Gray communities by standing tree size structure used in place of age structure,important values,the majority of species,community similarity in Ruiyen Mountain Scenic Spot,Taoyuan Hole Scenic Spot,Shaowu Jiangshi Provincial Nature Reserve and Nanping Mangdang Mountain Provincial Nature Reserve are analyzed.The results show that: in Ruiyen Mountain Scenic Spot,Taoyuan Hole Scenic Spot,Shaowu Jiangshi Provincial Nature Reserve and Nanping Mangdang Mountain Provincial Nature Reserve,the Quercus phillyraerides A.Gray communities belong to a recession-type stocks,the Syzygium buxifolium Hook et ARnpopulation will replace the Quercus phillyraerides A.Gray population declining significantly in Ruiyen Mountain Scenic Spot and Taoyuan Hole Scenic Spot.The dominant species and species composition are rich in Ruiyen Mountain Scenic Spot and Shaowu Jiangshi Provincial Nature Reserve;the dominant species is rich in Taoyuan Hole Scenic Spot and Mountain Provincial Nature Reserve,however,fewer species composition.The Luffing of Shannon-Wiener index is high between the tree layer and herb layer,while Pielou evenness index of tree layer,shrub layer and herb layer is similar.The communiy similarity is great between Ruiyen Mountain Scenic Spot and Taoyuan Hole Scenic Spot,Shaowu Jiangshi Provincial Nature Reserve,Nanping Mangdang Mountain Provincial Nature Reserve,which has the largest similarity coefficient(0.65) between Ruiyen Mountain Scenic Spot and Shaowu Jiangshi Provincial Nature Reserve.
2009 Vol. 7 (5): 87-93 [
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1447
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1219
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94
LI Zhuo-；Tun-Pu-Te-；Feng-Gao-；Diao-Xi-Ning-；Peng-Wen-Hua
Effects of soil clay content on soil water-holding capacity by simulated experiments
Quantitative effects of clay content on soil water-holding capacity were studied by compounding different texture of soil.The results showed that: 1) Soil clay content has a great effect on water-holding capacity.Soil water-holding capacity strengthened with the increase of clay content.The parameters of Gardner and van Genuchten soil water characteristic curve models went up with the increase of clay content.2) Soil clay content has a great effect on specific water capacity.The specific water capacity of experimental soils strengthened with the increase of clay content at any water suction level.3) The saturated water content and field capacity of experimental soils have exponential and logarithmic function relationship with clay content.And the relationship between the wilting coefficient and clay content is exponential function.4) while the clay content increase,available water and resistant available water content of experimental soils firstly increase and then decrease,and peak at the stage of soil clay content was 35.9% and 35.8%,respectively.There is no significant correlation between quickly available water and clay content.The results provides the theoretical basis for the further study on soil water-holding mechanism.
2009 Vol. 7 (5): 94-99 [
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1511
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1418
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100
ZHANG Yang-；Diao-Shi-Wei-；Hua-Juan
Effects of grassland vegetation restoration on soil saturated hydraulic conductivity in mountain area of southern Ningxia
Studying on soil saturated hydraulic conductivity(
K
s) characteristics of different measurements for vegetation restoration in mountain area of southern Ningxia will provide scientific basis for evaluating different measurements for vegetation restoration and discussing mechanism.There measurements for vegetation restoration were beneficial to improve
K
s
.
K
s
on 0-5 cm were improved most obviously.Values of
K
s
quickly reduced with depth under different communities.
K
s
was directly affected by soil organic matter(SOM) and capillary porosity.There was linear correlation between SOM and
K
s
in three measurements for vegetation restoration.The higher the content of SOM,the faster
K
s
increase.The accumulation of SOM was driving force for
K
s
. So enclosed meadows was the best measure for improvement of
K
s
and eclolgical restoration.
2009 Vol. 7 (5): 100-104 [
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1549
) [
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1133
)
105
CHEN Guo-Jian-；Tun-De-Chao-；Wang-Cai-Xia-；Wang-Cai-Jun-；Li-Yang-Bing
Dynamic changes of soil erosion in Three Georges Reservoir Area of Chongqing
This paper figures out Markov Transferred Rates Matrix of soil erosion in Three Gorges Reservoir Area of Chongqing and studies the translated relations between the different soil erosion intensities by overlapping the satellite images of soil erosion in 1995 and 2004 with GIS techniques,which discovered the characteristics of temporal-spatial change of soil erosion in Three Gorges Reservoir Area of Chongqing in past ten years.The results indicate the soil erosion intensities in Three Gorges Reservoir Area of Chongqing are very high because that the areas of moderate soil erosion and higher than 70.84 percent of the area of soil erosion in Three Gorges Reservoir Area of Chongqing and annual soil erosion modulus is 3 766 t/(km
2
·a) which is higher than that in Guizhou Province and Hubei Province;The area of soil erosion in Three Gorges Reservoir Area of Chongqing is 51.71 percent of the area of territory in Three Gorges Reservoir Area of Chongqing in 2004,this percentage is higher than the level of 37 percent of China and the level of 31.2 percent of Yangtze River basin,and much higher than that of neighboring Sichuan Province and Guizhou Province and Hubei Province.Between 1995 and 2004,the area of soil erosion in Three Gorges Reservoir Area of Chongqing reduced 22 percents and soil erosion intensities obviously descended,among which the area of moderate soil erosion is largest in soil erosion intensities and second in utmost soil erosion and intensity soil erosion.The improved degrees of soil erosion are positive correlation to soil erosion intensities in Three Gorges Reservoir Area of Chongqing.In overall terms,the soil erosion in Three Gorges Reservoir Area of Chongqing is basically under controlling and it ensured its ecological environment to evolve towards the sound development.
2009 Vol. 7 (5): 105-110 [
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2082
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1259
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111
DIAO Yong-；Fan-Wei-；Tun-Meng-Zuo-；Zhang-Jun-；Shu-Pan-Feng
Nutrient allocation and cycling pattern in the Robinia pseudoacacia plantation in hilly region of Taihang Mountains
The biomass and nutrient return in the Robinia pseucdoacacia plantation stand in hilly region of Taihang Mountains were investigated by means of the sample tree harvest method.The results indicate as follows: 1) The total biomass of tree layer was 39.87 t/hm
2
.The descending order of biomass of different organs was stem,root,bark,branch,leaf.2) The concentration of three elements in different organs showed the significant difference.The descending order of contents of three elements in stem,roots and bark was Nitrogen,Phosphors,Calcium, as for that in branch and leaf,Calcium,Nitrogen,Phosphors.3) The descending order of main elements in different organs was stem,leaf,branch,root,bark.Nutrient accumulation of three elements of the stand was 633.20 kg/hm
2
,The descending order of annual accumulation and retained amount is Calcium,Nitrogen,Phosphors,The accumulation of Calcium in the stands was 368.36 kg/hm
2
,18.19 kg/hm
2
for Phosphors,and 276.65kg/hm
2
for Nitrogen.4) The annual returned amount of three nutrient through litter was 286.52 kg/hm
2
,descending order of which is Calcium,Nitrogen,Phosphors.The annual returned amount of Calcium was 196.48 kg/hm
2
,that was 2.31 times more than those of Nitrogen and 40.26 times,for Phosphors.5) The descending order of absorption and enrichment coefficients of nutrient elements in the stand is Nitrogen,Phosphors,Calcium,as for utilization and cycling coefficients,Calcium,Nitrogen,Phosphors.The turnover period of Calcium was 1.87 a,which was the shortest among three elements,while the longest one,Phosphors with 3.73 a and the middle one,Nitrogen with 3.25 a.
2009 Vol. 7 (5): 111-116 [
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1698
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1077
)
117
WEN Zhong-Meng-；Jiao-Feng
Review of the studies on the prediction of natural vegetation distribution
Prediction of natural vegetation distribution can provide valuable references information for the biology conservation,climatic change,habitat management,and ecological rehabilitation.After careful analysis of the previous studies,this paper outlined the main trend of the studies on vegetation-environment relationships: the vegetation distribution is controlled not only by climate but also other factors such as topography and soil,and multiple factors analysis will be used more and more in the vegetation-environment relationship studies;in terms of precision of predictive models,the nonparametric models such as neural networks and general additive model(GAM) can give a better prediction than other models;the application of remote sensing and geographical information system can provide abundance of data and suitable techniques to analyze synthetically the vegetation-environment relationships on large scales,and promote the development of some more advanced models;No doubt that more progress has been made in China,yet there are still more space for the further development in the data updating,modeling method,and choice of scale and variables.
2009 Vol. 7 (5): 117-124 [
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1749
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1207
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