[1]SUN Zhi-hui,CAO Xue-mei,LI Xin-ya,et al.Effect of Climate Change and Human Activities on Soil Erosion in Wuqi[J].Research of Soil and Water Conservation,2009,16(06):30-34,39.
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Effect of Climate Change and Human Activities on Soil Erosion in Wuqi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
16
Number of periods:
2009 06
Page number:
30-34,39
Column:
Public date:
2009-12-20
- Title:
- Effect of Climate Change and Human Activities on Soil Erosion in Wuqi
- CLC:
- S157
- DOI:
- -
- Abstract:
- Regression analysis and establishing mathematical model by use of correlation analysis after analyzing the data on NDVI of GIMMS and SPOT VEGETATION, TM satellite data in 1997 and 2007, precipitation, runoff and sediment discharge, and draw the conclusion that the NDVI increased by 24.4% in the 9 years from 1999 to 2007 in Wuqi. There has obvious advantage in Aprail-October vegetation growing season, and with less change in winter by compared NDVI before and after farmland. The mean differences is 0.039, it is 0.062 in September, and is the most obvious, next came the May, October and August. Compared to 1997, with 75.15% of cultivated land is no longer farmed in 2007 in Wuqi. The withdrawal of the main arable land into grassland, woodland and orchards. forest coverage increased significantly, to 80.60% in 2007 from 37.06% in 1997; high slope cultivated land most returned, the 80%～90% of slope (>25°) land returned; low vegetation coverage of the land area reduced greatly, on the contrary, high vegetation coverage of the land area apparently increased, the achievement of returning farmland to forest (grass) is remarkable, the marked improvement in the ecological environment. Model calculations show that returning farmland to forest project produced a more obvious benefits of soil and water conservation, the average benefits of water reduction is 32%, it is 53.6% of sand reduction and, soil erosion decreased significantly. The contribution of human activities factor is much greater than precipitation.
- References:
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