| Evaluation on soil conservation effect of returning cropland to forest and grassland in forest-steppe zone of loess plateau |
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| DOI：10.7606/j.issn.1000-7601.2017.05.18 |
| Key Words: grain for green project soil conservation benefits RUSLE Loess Plateau |
| Author Name | Affiliation | | XUE Ya-yong | School of Earth Science and Resources, Chang'an University, Xi'an, Shaanxi 710054, China； State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | WANG Xiao-feng | School of Earth Science and Resources, Chang'an University, Xi'an, Shaanxi 710054, China； Shaanxi Key Laboratory of Disasters Monitoring & Mechanism Simulation, Baoji, Shaanxi 721016, China |
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| Abstract: |
| As an ecological transition zone and fragile eco-environmental region, Loess Plateau has suffered severe and large-scale soil erosion, and which has in turn greatly affected regional environment. In our study, on the basis of 2000, 2005 and 2010 meteorological data, soil conservation benefits under different slope gradients, vegetation coverage and land-use types were separately assessed with the method of Revised Universal Soil Loss Equation (RUSLE) at the forest-steppe zone of Loess Plateau. By analyzing, the main conclusions (results) were as follows: (1) Since the implementation of Grain for Green Project in 1999, the total vegetation coverage of the study area has gradually increased, and the area of woodland and grassland have also significantly increased, with increment of 2 219.41 km2 and 2 205.27 km2respectively. (2) From 2000 to 2010, soil conservation quantity increased by 241 million ton, and soil conservation quantity per unit area increased from 3 033.15 t·km-2·a-1 to 5 114.86 t·km-2·a-1, indicating a remarkable improvement of regional soil conservation benefits. (3) Soil conservation benefits were positively correlated to vegetation coverage. In different land use types, woodland, grassland and cultivated land had much higher soil conservation benefits than others, whose soil conservation quantity per unit area of 5 405.57, 3 598.41 t·km-2·a-1 and 3 078.81 t·km-2·a-1 respectively. Soil conservation benefits of the study area have notably improved in the help of Grain for Green Project, however there is a series of serious problems of vegetation deterioration, surface subsidence and soil erosion caused by exploitation of mineral resources in northeastern part of this area. More measures should be taken to harmonize the exploitation activities with ecological restoration. |
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