中国水土保持科学
Home
About Journal
Editorial
Publication Ethics
Instruction
Subscription
Contact Us
中文
Editorial 1
Editorial 2
Editorial 3
Editorial 4
For Author
Scope for Articles
Writing Format
中国水土保持科学
Paper Search
Adv Search
2012 Vol.10 No.5
Published 2012-10-31
Articles
1
WANG Xi-Jing, TUN Xiu-Qin, ZHANG Yu-Qing, TUN Bin, MA Jing, LIU Bo
An ecogeographical regionalization for biodiversity in desert ecosystem of China
Ecogeographical regionalization is the basis for spatial differentiation of biodiversity research. In view of the principle of international ecogeographical regionalization, this study has applied experienced assessment and GIS method and based on some ecogeographical attributes limited to the distribution of plant and vegetation, including climatic factors, such as monthly mean temperature, annual average temperature; annual precipitation, moisture index, drought index; biological factors such as vegetation types, vegetation division types, florisitic types, fauna types, abundance of plant species, genus and endemic genus; soil factors such as soil types, soil organic matter; topographical factors as longitude, latitude and altitude etc. Based on the regionalization principle and ecogeographical attributes, the desert ecosystem was stratified into discrete geographical units of uniformity at 3 levels: wet district, natural area, type area. Based on this 3-class-system, the desert ecosystem was divided into 67 special type areas further.
2012 Vol. 10 (5): 1-8 [
Abstract
] (
1365
) [
HTML
1KB] [
PDF
2932KB] (
1475
)
9
JIA Jiang-Bao, GU Chu-Jun, ZHOU Feng, LIU Jing-Chao, BANG Chao-Yun
Soil particle fractal dimension and soil moisture physical properties in different forest stands in hilly red soil region
Based on the theory of soil fractals and physical hydrology, we investigated soil particle size distribution (PSD), fractal dimension, soil water physical parameters and related affecting factors of four typical vegetations in hilly red soil region of Changding County, Fujian Province. Our aims are to explore the improving effect and the mechanism of the forest vegetation to soil fractal structure and soil moisture physical property. The results indicated that: 1) in hilly red soil region, the mass fraction sequence of soil particles among all kinds of forests was given as follows: coarse>fine sand and gravel particles>silt and clay. Forests could improve the contents of soil fine sand and silt and clay, compared with bare land, and the mixed forest has better improving effects than pure forest. 2)Vegetation restoration could decrease the soil bulk density and increase soil porosity. The sequence of soil total porosity and capillary porosity was given as follows: conifer-broadleaf forest land>arbor mixed with shrub land>conifer forest land>economic forest land>bare land. The soil saturated water content of conifer-broadleaf forest land, arbor mixed with shrub land, conifer forest land, and economic forest land was 1.20,1.16,1.14,1.10 times higher than that of bare land, respectively. The capacity of soil water storage in 0-20 cm soil layer was larger than that in 20-40 cm soil layer. 3)The sequence of soil fractal dimension was given as follows: conifer-broadleaf forest land>arbor mixed with shrub land>conifer forest land>economic forest land>bare land. Soil fractal dimension in 0-20 cm soil layer was larger than that in 20-40 cm. Fractal dimension had significantly positive correlation with soil silt and clay, total porosity, soil saturated water content and void ratio, and had negative correlation with the mass fraction of gravel, soil density. But there was no significant correlation with non-capillary porosity, non-capillary porosity water-holding content, and soil total absorption precipitation and effective precipitation. The soil of four typical forest stands were good structural soil with uneven coefficient in hilly red soil region. Mixed forest has better soil particle distribution, particularly, conifer-broadleaf forest soil. The improving effect of forest vegetation on soil fractal structure and soil moisture physical property was followed as this order: conifer-broadleaf forest land> arbor mixed with shrub land > conifer forest land > economic forest land. The fractal geometry mechanism of improved soil fractal structure and soil moisture property with forest communities was to increase the soil fractal dimension by raising the content of fine-grained soil particles, thereby improving aggregate structure, pore structure, soil texture uniformity and soil moisture physical property. The results of this study could provide reference for scientific selection and distribution of water conservation vegetation types in hilly red soil region.
2012 Vol. 10 (5): 9-15 [
Abstract
] (
1326
) [
HTML
1KB] [
PDF
855KB] (
1346
)
16
HUANG Meng, ZHANG Jian-Jun-Ying, RU Hao, GUO Bao-Ni, LI Min-Xi, WANG Chun-Xiang, WANG Dan-Dan, LIANG Wei
Characteristics of runoff and sediment in small watersheds under different vegetation cover in the Loess Plateau of Western Shanxi Province
To investigate process of runoff yield and sediment transport in small watersheds under different vegetation cover, three typical small watersheds were selected as study area, which belong to Caijiachuan Watershed in Ji County, Shanxi Province. Contrastive analysis was used for the study. The results show that both runoff and sediment yield increased with rainfall, but this was not a linear increase with a certain rate. The runoff and sediment yield also increased with rainfall intensity, and the increase rate of the sediment yield was greater than that of runoff. The rainstorm with short duration may cause serious soil erosion in the Loess Plateau. So more attention should be focus on this type of rainfall. The runoff and soil erosion were the least in small watershed with naturally recovered vegetation, and then followed by the small watershed with artificial vegetations, the runoff and soil erosion of level terrace were largest. The effect of naturally recovered vegetation on reducing runoff and soil erosion resulted form rainstorm was optimum, therefore, how to naturally recover vegetation in the Loess Plateau is the key to control water and soil erosion.
2012 Vol. 10 (5): 16-23 [
Abstract
] (
1276
) [
HTML
1KB] [
PDF
952KB] (
1241
)
24
CHAN Nan, YANG Xiao-Hui, SHI Zhong-Jie-Ying, YAN Feng
Spatial and temporal distribution of aerosol optical depth in China based on MODIS
Characteristics of spatial and temporal distribution and variation trends of aerosol optical depth (AOD,on 550 nm) in China were analyzed by linear regression and correlation analysis in this paper with monthly mean data by the NASA MODIS08_C5 product from 2000 to 2008. The results indicate that the all-year high value of AOD occurred in the southern Sinkiang basin, the Yangtze river region and the Sichuan basin. There are significant differences in seasonal variation of AOD, but the trend was increased first and then decreased in most areas during the year. AOD reaches its maximum value in April. The monthly average of AOD and the sum occurrence times of sand-dust had an obvious relationship. The monthly occurrence frequency of dust and the monthly mean AOD showed a significant linear correlation where the dust occurred more than 10 times, otherwise there was no obvious relations between them.
2012 Vol. 10 (5): 24-30 [
Abstract
] (
1325
) [
HTML
1KB] [
PDF
3973KB] (
1290
)
31
LI Yang-Fang, SONG Wei-Feng, BANG Yong-Gang, LI Jian
Anti-scourability of surface soil of different land use types in area of Yuanyang terrace
On the basis of undisturbed soil erosion groove method and the field scouring test method with the physical properties of woodland, shrub land, waste grassland and slope farm land, the anti-scourability of surface soil of those four land use types and the main influencing factors were studied in core area of Yuanyang County with the purpose of studying the soil erosion characteristics and the mechanism of water conservation. The results showed that the anti-scourability of surface soil of waste grassland was the best, and then followed by shrub land, forest land and slope farm land. With the increase of slope and the water flow the sediment amount increased as well, slope farm land had weak anti-scourability. The fibrous roots could enhance the soil anti-scourability, especially the roots with diameter less than 1.0 mm had strong consolidation. If there were more water-stable aggregate, the anti-scourability was stronger. If the diameter of soil particle in surface soil of waste grassland and shrub land was larger than 3.0 mm, the water-stable aggregates content was 93.33%.
2012 Vol. 10 (5): 31-35 [
Abstract
] (
1278
) [
HTML
1KB] [
PDF
837KB] (
1592
)
36
CA Xian-Li, ZHOU Yun-Chao, LIU Xiao-Yun, MA Li-Beng, TIAN Xiao
Nutrient blocking effects of plant hedge with various rows on slope farmland nearby Hongfeng Lake
In order to choose a appropriate width of plant hedge for soil and water conservation on slope farmland nearby Hongfeng Lake, different widths of plant hedge of mixed Vetiveria zizanioides and Tephrosia purpurea ( basic hedge were composed of 1 line Vetiveria zizanioides and 1 line Tephrosia purpurea, and 2 row hedge means 1 basic hedge. ) were designed, each plant hedge treatment with 3 bands, including 0 (control), 2, 4, 6 rows/ band, and 2-4-6 rows from top to bottom. Surface runoff, sediment and nutrients were compared. All indexes of treatments were lower than that of the control. According to the variance analysis and F-test, significant differences among different treatments were found. 1) Further multiple comparison results showed that nutrient elements were significantly blocked by the plant hedge treatments except for 2-rows/ band treatment. 2) There was no significant difference among treatments with 2-rows/ band, 4-rows/ band and 2-4-6 rows from top to bottom, but the difference between 6-rows/ band and 2-rows/ band treatments was significant. 3 ) There was only significant difference in blocking effect of soil P and K between the treatment of 6-rows/ band and other two treatments of 4-rows/ band and 2-4-6 rows from top to bottom. From results of both experiment and practical application, 4-rows/ band probably is the best choice for local place, followed by 2-4-6 rows from top to bottom.
2012 Vol. 10 (5): 36-42 [
Abstract
] (
1127
) [
HTML
1KB] [
PDF
861KB] (
1126
)
43
TANG Chong-Jun, YANG Jie, CHEN Xiao-An, TU An-Guo, WANG Bang-Wen
Characteristics of runoff and sediment yield of different Cynodon dactylon protection models in Huai River levee
Different treatments with Cynodon dactylon on dam protection will have effects on soil and water loss processes under different rainfall types, which will had great significance to guide dam protection and soil and water loss control. Responses of soil and water loss characteristics to rainfall types were studied by simulated rainfall under 4 dam proctection treatments with Cynodon dactylon in Huai River levee. The results showed that there were obvious differences in soil and water losses between different treatments. At each rainfall intensity, runoff with planting treatment was small, but sediment yield was significantly higher than that with the turf treatment and stem cover treatment. Runoff with stem cover treatment was great, but sediment was small, which means reducing sediment with no runoff reduction. Runoff and sediment yield with sowing treatment were great, and significantly increased with rainfall intensity. This study results would provide reference for optimizing implementation model of dam protection with Cynodon dactylon.
2012 Vol. 10 (5): 43-48 [
Abstract
] (
1031
) [
HTML
1KB] [
PDF
855KB] (
1304
)
49
HUANG Peng-Fei, LIU Min, WANG Wen-Long, LUO Ting
Runoff and sediment generation on disturbed land in the process of Shenfu coalfield construction
To analyze the law of runoff and sentiment generation of the disturbed land in the process of coalfield construction, taking the disturbed land in Shenfu coalfield as study object, compared with undisturbed land, dynamic process of runoff and sediment generation were studied by runoff scouring experiments . The results show that: 1) The soil infiltration rate, sentiment yield and soil detachment rate increase with the flow discharge and the slope gradient; 2) Under different discharge rates ranging from 5 to 25 L/ min, the average soil infiltration rate (0.14-0.51 mm/ min), sendiment yield (62.16-118.66 g/ L) and soil detachment rate (19.38-202.58 g/ (m2·s)) of the disturbed land are respectively 0.44-0.73 times, 10-39 times and 9-79 times as great as that (0.31-0.61 mm/ min, 1.61-12.05 g/ ,L, 0.24-21.75 g/ (m2·s)) of the undisturbed land; 3)While in different slope gradients ranging from 5°to 18°, the average sentiment yield (36.19-155.96 g/ L) and soil detachment rate (0.79-2.70 g/ (m2·s)) of the disturbed land was respectively 11-23 times and 14-22 times as great as that (3.27-9.62 g/ L, 0.05-0.19 g/ (m2·s)) of the undisturbed land; 4) Further analysis indicates that power regress function exits significantly in the average soil detachment rate with flow discharge and slope gradient about the undisturbed and disturbed land. The results could give very important reference to restore and reconstruct the eco-environment and estimate the soil erosion of the coal fields.
2012 Vol. 10 (5): 49-55 [
Abstract
] (
1128
) [
HTML
1KB] [
PDF
925KB] (
1300
)
56
JIANG Chong, WANG Fei, MU Xin-Min, LI Rui
Effects of climate change on net primary productivity of vegetation in the northern and southern regions of the Qinling Mountains(玉): Temporal and spatial characteristics of climate change in recent 52 a
Based on the daily data from 54 meteorological stations in Northern and Southern Regions of the Qinling Mountains between 1960 and 2011, with the help of FAO Penman-Monteith formula, the potential evapotranspiration and humid index were calculated. By using the Spline interpolation method, climate trend rate, correlation analysis and other methods, we analyzed the distribution of temporal and spatial variation characteristics of temperature, precipitation, potential evapotranspiration and humid index as well as the meteorological elements which influenced evapotranspiration and humid index. The results are given as follows: 1) The average annual temperature of the northern and southern regions increased gradually from north to south, 1993 was the turning point of temperature, and cooling trend in southern area before 1993 was more obvious. Since 1994, the temperature of most stations increased significantly (
P
<0.01), and there was no significant difference among four regions. 2) The annual precipitation decreased from south to north. Precipitation showed a downward trend before 1995, and the northern region was more obvious. While precipitation increased since 1995, including more than 70% stations. The northern part was becoming dry while the southern slope was becoming wet, and there was no significant change in other parts. 3)The potential evapotranspiration decreased from eastern part to western part. All the sub regions showed consistent downward trend (
P
<0.05). Southern slope was more obvious than northern slope, but there was no significant turning point. 4)The humid index decreased from south to north. The northern region was becoming warmer and drier, while southern region was becoming cooler and wetter. At the seasonal scale, four sub regions showed the same tendency, that humid index of most stations in spring and autumn showed a decreasing trend while in summer and winter showed an increasing trend. 5) Sunshine hours, average temperature, maximum temperature and evapotranspiration correlated negatively with humid index significantly (
P
< 0.01). But minimum temperature and wind speed had no significant relationship with humid index. The increase of precipitation and relative humid can improve humid index.
2012 Vol. 10 (5): 56-63 [
Abstract
] (
1232
) [
HTML
1KB] [
PDF
4649KB] (
1366
)
64
SHI Yang-Yang, ZHANG Guang-Hui, CHEN Yun-Meng, WANG Bing
Characteristics of undergrowth herbage of different restoration models in the Loess Hilly region
Taken abandoned farmland (CK) as control, the undergrowth vegetation investigation wasconducted on four land-use types of Caragana korshinskii (CKK), Robinia pseudoacacia (RP), Pinustabulaeformis (PT) and mixed forest of Pinus tabulaeformis and Amorpha fruticosa (PA) in the loess hillyregion of Zhifanggou watershed. These five kinds of land types were restored for almost 37 years fromslope farmland. The variations of vegetation coverage, aboveground and underground biomass, litteramount, ratio of root to shoot and root length density and the relationship among them were studied. After37 years vegetation restoration and construction, abandoned farmland has the highest value of speciesdiversity, vegetation coverage and aboveground biomass, while Pinus tabulaeformis land has the lowestspecies diversity, and Caragana korshinskii land has the lowest vegetation coverage and abovegroundbiomass. The orders of species diversity, vegetation coverage and aboveground biomass were given asfollows: CK>PA>PT>RP>CKK, CK>CKK>RP>PA>PT and CK>RP>CKK>PA>PT, respectively. The results of ANOVA showed that there was a significant difference in aboveground biomasses (P<0.01),while no difference was found in underground biomass. Mixed forest of Pinus tabulaeformis and Amorphafruticosa has the highest value of the litter amount and underground biomass, while Robinia pseudoacaciawas the lowest. The orders of litter amount and underground biomass were given as follows: PA>CKK>PT>CK>RP and PA>CKK>CK>PT>RP, respectively. The results of ANOVA showed that there was asignificant difference in underground biomass (
P
<0.05), while no difference was found in litter amount.Mixed forest of Pinus tabulaeformis and Amorpha fruticosa has the highest value of the ratio of root to shootand root length density, while abandoned farmland was the lowest. The orders of the ratio of root to shootratio and root length density were given as follows: PA>PT>CKK>RP>CK and PA>CKK>RP>PT>CK,respectively. Root biomasses of different soil layers could be simulated well by indices of abovegroundvegetation characteristics with serious of power functions (
P
<0.01). The results of ANOVA showed thatthere was a significant difference in the ratio of root to shoot (P <0.05) and root length density (
P
<0.05).
2012 Vol. 10 (5): 64-70 [
Abstract
] (
1129
) [
HTML
1KB] [
PDF
882KB] (
1387
)
71
GUO Gong-Yan, ZHOU Jin-Xing
Underground soil and water leakage in Karst rocky desertification areas
Compared with non-karst area, the soil and water loss in karst area has its specificity, that issoil and water loss occurred at the same time in surface and underground leakage. Especially, theunderground leakage is not well known by people. In this paper, we analyze the causes of rockydesertification from natural and human factors. Then, we give detailed analysis on the hazard and theactive mechanism of the soil and water underground leakage in Karst rocky desertification. Finally, bysummarizing the research methods of soil underground leakage, we propose the prevention and controlmeasures of underground soil and water leakage in Karst rocky desertification. The purpose of this paperis to provide basis and reference for the control of underground soil and water leakage in Karst rockydesertification.
2012 Vol. 10 (5): 71-76 [
Abstract
] (
1263
) [
HTML
1KB] [
PDF
1926KB] (
1268
)
77
LIU Bao-Jun, DIAO Xiao-Guang, DANG Xiao-Hu, WANG Guo-Liang, YUAN Zi-Cheng
Characteristics of plant community succession on abandoned farmlandin the Hilly-Gully Region of Loess Plateau
In order to understand the characteristics and model of plant communities succession in the Hilly-Gully Region of northern Shaanxi Province, an investigation in 20 abandoned farmlands with different ages was carried out through the approach of substituting the temporal serial with spatial serial at Zhifanggou Watershed. The results showed that the abandoned farmland successive phases were affirmed.The successive phases were as follows: Artemisia capillaries community—Weeds—Setaira viridis community—Stipa bungeana community—Artemisia sacrorum community—Artemisia giraldii community.The Shannon-Wiener index, Simpson index, Margalef index and Pielou index also increased in the succession process, but the rising rates of them were different. The species patterns of initial and middle succession stage appeared as logarithmic series distribution, which implies that niche pre-emption was the main factor in controlling the structure. The species patterns of the later stage performed as lognormal distribution, their community structures could be affected by niche pre-emption, seed invasion stress of the nearby community, interspecies competition and other factors concurrently. Coverage change and community succession time were related to the quadratic function.
2012 Vol. 10 (5): 77-83 [
Abstract
] (
1160
) [
HTML
1KB] [
PDF
875KB] (
1452
)
84
XU Hong-Yu, WANG Yang-Yu, SONG Gui-Long
Causes and countermeasures to prevent and control slope landslide for freeway:The third period of Jingcheng freeway(Shayugou-city boundary section of Beijing)
Taken the slopes of the third period (Shayugou-city boundary section of Beijing) of Jingcheng freeway as example, this study surveys the forms and characteristics of the landslide, analyzes its reasons and give some control suggestions. Results show that, the forms of slope landslide occurred Slope-instability and Zoarium-decline and Indriection-landslide for both Rock slopes and Soil-rock slopes.Slope-instability was the most important form for the two slope types. By analyzing slope landslide causes,it can be obtained that Drainage Works could give the reason for Slope-instability form, i. e. faultiness on Soil-rock slopes and irrational design on Rock slopes. Stabilization Works could give the reason for the Zoarium-decline form, i. e. insufficient anchoring effect of anchor and limited anchoring effect of plants roots on Soil-rock slopes, vice verse on Rock slopes. The landslide of uphill could give the reason for Indriection-landslide form. In conclusion, some advices about landslide prevention were given according to the existing problems of these landslide slopes from Drainage Works and Stabilization Works and so on.
2012 Vol. 10 (5): 84-89 [
Abstract
] (
1169
) [
HTML
1KB] [
PDF
1535KB] (
1455
)
90
LI Jun, WANG Yong-Meng, CHEN Bo, ZHAO Xin-Miao, YANG Xin-Bing
Relationship between the short-term thinning of Larix principis-rupprechtii plantation and forest productivity
In order to study the effect of short-term thinning on the growth and productivity of Larix principis-rupprechtii plantation, thinning plots with different reserve densities(450,600,750,900 strains/hm2) and the corresponding control plots were set. Tree height, diameter, individual volume, stand volume, biomass and productivity before and after thinning were measured and calculated. The results show that: with different reserve density, growth of diameter, tree height and individual volume in thinned plots was larger than that in control plots; with decreased reserve density, the stand volume and biomass in thinned plots were less than that in control plots; the productivity of thinned plots decreased by 7 969 kg/ (hm2·a) compared with control,but its growth rate was greater than the control plots.Thinning changed the spatial structure and growth conditions of stand, promoted growth of trees significantly, and increased the economic benefit of forest.
2012 Vol. 10 (5): 90-93 [
Abstract
] (
988
) [
HTML
1KB] [
PDF
825KB] (
1404
)
94
WANG Di, MA Feng-Yun, YAO Xiu-Fen, XIN He, SONG Xue, ZHANG Zhong-Xin
Properties of soil microbes, nutrients and soil enzyme activities and their relationship in a degraded wetland of Yellow River Delta
The soil enzyme activities,nutrients and microbes and their relationship at different successive stages were analyzed in a degraded wetland of the yellow river delta,the main results indicated that during the reverse succession from Imperata cylindrical community to bare land in wetland,the vitality of soil urease and protease activity decreased gradually. Similarly,the vitality of alkaline phosphates activity and catalase also decreased. The othernesses of enemy activity existed in different successive stages,the activity of soil protease enzyme was the best. With reverse succession of wetlands,main soil nutrients almost declined. There were significant differences of soil nutrient in different successive stages. The microbial quantity had significant differences in a degraded wetland of the yellow river delta. In soil microbial community,bacteria accounted for the largest proportion,which took absolute advantage in the amount. Secondly is actinomyces,and amount of fungi was the least. Imperata cylindrical community had maximum value on bacteria and fungi while actinomyces reached the maximum at Tamarix chinensis community. The soil enzyme had remarkable positive correlation with nutrients and microbes. Bacteria were closely related to soil urease and catalase enzyme. Fungi had remarkable correlation with soil urease enzyme,catalase enzyme and alkaline phosphate enzyme.
2012 Vol. 10 (5): 94-98 [
Abstract
] (
1184
) [
HTML
1KB] [
PDF
828KB] (
1533
)
99
BI Hua-Xin, YU Xin-Xiao, SHI Chang-qing
Revision points and main changes of the textbook:Science of Soil and Water Conservation (third edition ) compared with its second edition
The textbook-Science of Soil and Water Conservation and its second revision was published in 1995 and 2005, respectively, and over 20 000 copies have been printed up to now greatly supported and concerned by readers. The textbook has been a national textbook, important reference book, valuable guidance book for the college students who major in soil and water conservation and related specialty.Also, it is an indispensable textbook for students who would take part in the graduate student entrance examination in soil and water conservation specialty. The third version of the textbook was compiled recently based on its second version and new perspective in the field of soil and water conservation according to the key national textbook compiling plan during Twelfth Five-Year Plan. In order to enable readers to well understand the new content of the third revision, this paper introduces the arrangement of content of the third version and lists the main changes in content of the third version compared with its second version.
2012 Vol. 10 (5): 99-103 [
Abstract
] (
1202
) [
HTML
1KB] [
PDF
809KB] (
1268
)
104
SHI Dong-Mei, JIANG Dong
Training mode for postgraduates of soil and water conservation and desertification control discipline
Based on the comprehensive analyses of educating environment and educating phrases for postgraduates of soil and water conservation and desertification control discipline, the paper concludes that the innovative personnel cultivation mode should adhere to the concept of diversity educating and producing-teaching-research-oriented pattern, and the concept of classification education for academic postgraduates, professional postgraduates. So, the innovative cultivation mode could be established from four interrelated aspects: course setting, research-based teaching process, innovative process of research activities and professional development-based training process during three different cultivating phrases,which can ultimately achieve the cultivation objectives and meet the needs of social development.
2012 Vol. 10 (5): 104-108 [
Abstract
] (
1143
) [
HTML
1KB] [
PDF
832KB] (
1345
)
109
XUE Pei-Pei, WANG Bing, NIU Xiang, LI Feng-Qing
Present situation and prospect of assessment methods of forest ecosystem health
Forest is the main body of forestry and is a constituent part and essential measure of sustainable forest management. Forest health has attracted more attention at home and abroad, and became one of the important domains of forestry research. Based on the development history and connotation of forest ecosystem health, the main assessment methods of forest health were summarized in detail in this paper: index system method, ecological instructions method and health distance method.The merits and shortcomings of different methods were analyzed. In future researches, rapid diagnosis and assessment methods will be the key orientation, and the following aspects should be paid more attention: 1)to define the conception of forest ecosystem health; 2) to form simplified index systems of rapid diagnose and evaluation of forest health; 3) to establish methods for rapid diagnose and evaluation of forest health; 4) applied technology of rapid diagnosis and assessment of forest health; 5)studies on rapid diagnose and evaluation of forest health with multi-technologies, multi-methods and in multi-scales.
2012 Vol. 10 (5): 109-115 [
Abstract
] (
1250
) [
HTML
1KB] [
PDF
881KB] (
1487
)
116
LIU Feng-Chan, LI Hong-Li, DONG Zhi, ZHANG Hao
Advances in research on enclosure effects on vegetation restoration and soil physicochemical property of degraded grassland
Enclosure is one of the effective measures for ecological restoration of degraded grassland. On the basis of existing research, the effect of enclosure on plant diversity, biomass, vegetation succession,soil physical and chemical property were summarized and six contents and directions were proposed about degraded grassland enclosure research in future. Conclusion: As a result of different geographical area,climatic conditions and degradation degree before enclosure, vegetation diversity under enclosure appeared three results, significant increase, stability and dramatic decline. Biomass increased in the early period of enclosure, and for long time enclosure biomass could not keep the increasing tendency. In addition, enclosure could increase population colonizing ability and community resources redundancy,prompt the improvement of soil seed bank structure, increases of density and positive succession of prairie which may appear three succession modes. Enclosure improved the physics properties of soil, since at soil surface “tight layer”was eliminate, but conclusions of enclosure effect on soil nutrients were not too consistent.
2012 Vol. 10 (5): 116-122 [
Abstract
] (
1075
) [
HTML
1KB] [
PDF
870KB] (
1932
)
