|
|
|
| Characteristics of soil and water loss on purple slope farmland and its control in upper reaches of the Yangtze River |
| Niu Jun1,2,Zhang Pingcang1,Xing Mingxing2 |
| 1.Department of Soil and Water Conservation,Yangtze River Scientific Research Institute,430010,Wuhan;2.Xiaolangdi Engineering Consulting Company Ltd.,450000,Zhengzhou:China |
|
|
|
|
Abstract Purple soil is one of the most important land resources in upper reaches of the Yangtze River,however,the severe soil and water loss caused a series of problems.The paper analyzed the runoff characteristics of purple soil in a hill-slope,studied the mechanisms of runoff acts on soil loss,and brought out solutions to prevent soil and water loss on purple slope farmland.The results showed that,stored-full runoff was the main pattern of runoff yield in slope farmland of purple soil,and interflow accounted for a larger percentage of total runoff.Soil erosion on purple slope farmland resulted in soil coarseness and nutrition loss in this specific area,the nutrient loss approaches were related to the solubility of nutrient elements,for instence,N and K were chiefly lost in dissolved state,while P was mainly lost with soil particles.Interflow is an important exogenetic force which causes soil and water loss in slope farmland of purple soil,and it should be controlled for soil and water conservation.According to the characteristics of soil and water loss in this specific area,managements must be carried out,and strategies of the managements includes "increasing infiltration,conserving from erosion;draining water,keeping soil;impounding after draining for utilization".
|
|
Received: 30 June 2010
|
|
|
|
|
|
|
