Effect of Land Use on Soil Erosion and Nutrients in Dianchi Lake Watershed, China  

作　　者：NIU Xiao-Yin WANG Yan-Hua YANG Hao ZHENG Jia-Wen ZOU Jun XU Mei-Na WU Shan-Shan XIE Biao 

机构地区：[1]College of Geography Sciences, Nanjing Normal University [2]College of Resource and Environmental Engineering, Shandong University of Technology

出　　处：《Pedosphere》2015年第1期103-111,共9页土壤圈（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41273102,41030751 and 41273103)

摘　　要：Soil erosion and loss of soil nutrients have been a crucial environment threat in Southwest China. The land use and its impact on soil qualities continue to be highlighted. The present study was conducted to compare soil erosion under four land use types(i.e.,forestland, abandoned farmland, tillage, and grassland) and their effects on soil organic carbon(SOC), total nitrogen(TN) and total phosphorus(TP) in the Shuanglong catchment of the Dianchi Lake watershed, China. There were large variations in the erosion rate and the nutrient distributions across the four land use types. The erosion rates estimated by137 Cs averaged 2 133 t km-2year-1under tillage and abandoned farmland over the erosion rate of non-cultivated sites, and the grasslands showed a net deposition. For all sites, the nutrient contents basically decreased with the soil depth. Compared with tillage and abandoned farmland, grassland had the highest SOC and TN contents within 0–40 cm soil layer, followed by forestland. The significant correlations between137 Cs, SOC and TN were observed. The nutrient loss caused by erosion in tillage was the highest. These results suggested that grassland and forestland would be beneficial for SOC and TN sequestration over a long-term period because of their ability to reduce the loss of nutrients by soil erosion. Our study demonstrated that reduction of nutrient loss in the red soil area could be made through well-managed vegetation restoration measures.Soil erosion and loss of soil nutrients have been a crucial environment threat in Southwest China. The land use and its impact on soil qualities continue to be highlighted. The present study was conducted to compare soil erosion under four land use types（i.e.,forestland, abandoned farmland, tillage, and grassland） and their effects on soil organic carbon（SOC）, total nitrogen（TN） and total phosphorus（TP） in the Shuanglong catchment of the Dianchi Lake watershed, China. There were large variations in the erosion rate and the nutrient distributions across the four land use types. The erosion rates estimated by137 Cs averaged 2 133 t km^-2year^-1under tillage and abandoned farmland over the erosion rate of non-cultivated sites, and the grasslands showed a net deposition. For all sites, the nutrient contents basically decreased with the soil depth. Compared with tillage and abandoned farmland, grassland had the highest SOC and TN contents within 0–40 cm soil layer, followed by forestland. The significant correlations between137 Cs, SOC and TN were observed. The nutrient loss caused by erosion in tillage was the highest. These results suggested that grassland and forestland would be beneficial for SOC and TN sequestration over a long-term period because of their ability to reduce the loss of nutrients by soil erosion. Our study demonstrated that reduction of nutrient loss in the red soil area could be made through well-managed vegetation restoration measures.

关 键 词：137Cs nutrient loss soil organic carbon total nitrogen total phosphorus vegetation restoration 

分 类 号：S157[农业科学—土壤学] S158[农业科学—农业基础科学]