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[1]KOU Meng,JIAO Juying.Structure of Erosion-Resistant Plant Community in the Hill-Gully Region of the Loess Plateau[J].Research of Soil and Water Conservation,2018,25(06):7-14,21.

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Structure of Erosion-Resistant Plant Community in the Hill-Gully Region of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 7-14,21 Column: Public date: 2018-10-26

Title:: Structure of Erosion-Resistant Plant Community in the Hill-Gully Region of the Loess Plateau

Author(s):: KOU Meng^1,2, JIAO Juying^2,3; 1. College of Resources & Environment and History & Culture, Xianyang Normal University, Xianyang, Shaanxi 712000, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: plant community; soil erosion; structure vegetation cover index

CLC:: S157

DOI:: -

Abstract:: The Loess Plateau is well known for its severe soil erosion. Vegetation was the most effective and essential measure to prevent and control soil erosion. Plant communities were composed by different vegetation layers in the vertical direction, and different vegetation layers had different functions for soil and water conservation. Therefore, vegetation with certain vegetation coverage and good structure has the good effects on soil and water conservation, which was the key that vegetation could conserve soil and water. In view of this, the structure vegetation cover index (Cs) was used to analyze the community structure which could resist soil erosion. Plant community structure vegetation cover index and soil erosion data in different plant communities were used to illuminate the community structure index that could indicate the abilities resisting soil erosion. The main results were as follows. The Cs values were obvious difference in different hydrological years. In the year of rainstorm, the communities need to have higher Cs value when it was able to effectively reduce soil erosion. Different communities have their own suitable structure vegetation cover index (Cs). Early succession community and afforestation did not show the strong erosion-resistant, when the Cs were more than 20% and 30%, respectively, and the cover of herb layer and litter layer was higher, the soil erosion intensity was less than 2 500 t/(km²·a), it was light erosion. When Cs of mid and late succession communities, and natural tree and shrub communities were more than 30%, and 36% respectively, and at least one of the cover of near surface layers (shrub, herb, litter layer) was higher, these communities could be effective in reducing soil erosion. Especially in the year of rainstorm, Gramineous plant communities, natural tree and shrub communities could effectively control soil erosion. When the Cs of these communities were more than 38% and 30%～40%, respectively, and at least one of the cover of near surface layers was higher, soil erosion intensity was less than soil loss tolerance [1 000 t/(km²·a)] in the Loess Plateau Region.

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