[1]JIANG Guantao,GAO Peng,MU Xingmin,et al.Effect of Conversion of Farmland to Forestland or Grassland on the Change in Runoff and Sediment in the Upper Reaches of Beiluo River[J].Research of Soil and Water Conservation,2015,22(06):1-6.
Copy
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 06
Page number:
1-6
Column:
Public date:
2015-12-28
- Title:
-
Effect of Conversion of Farmland to Forestland or Grassland on the Change in Runoff and Sediment in the Upper Reaches of Beiluo River
- Author(s):
-
JIANG Guantao1, GAO Peng1,2, MU Xingmin1,2, CHAI Xueke1
-
1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
-
- Keywords:
-
conversion of farmland to forestland or grassland; change in runoff and sediment; change point analysis; the upper reaches of the Beiluo River
- CLC:
-
P333
- DOI:
-
-
- Abstract:
-
Grain for Green Program launched since 1999 has resulted in a great vegetation restoration in the upper reaches of the Beiluo River on the Loess Plateau, China, which fundamentally influenced hydrological cycle and sediment transportation. The objectives of this work are to quantify the change trend and identify change points of precipitation, runoff and sediment load through April to October from 1971 to 2010. The result showed that a significant downward trend in the runoff and sediment and no significant trend in the precipitation were found during the period of record; combined with the data of the measures of soil and water conservation, the analysis of four kinds of change points revealed that mutations of runoff and sediment emerged in 2002; the double accumulative curve was applied to quantitatively analyze the effect of precipitation and human activities. Taking the period from 1971 to 2002 as the base span, we obtained that the rates of contribution of precipitation and human activities to the reduced runoff accounted for 70.8% and 29.2%, respectively; the rates of contribution of precipitation and human activities to the decreased sediment were 34.0% and 66.0%, respectively, in the period from 2003 to 2010. Compared to former periods, conversion of farmland to forestland or grassland in the study area was expected to be the driven factor to the decrease of sediment transportation.