晋西黄土区退耕林地土壤抗冲性研究  

Research on Soil Anti-erosion of Grain for Green Mixed Forest in Loess Plateau of Western Shanxi Province

作　　者：王丹丹[1] 张建军[1] 丁杨[1] 茹豪[1] 李玉婷[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083

出　　处：《水土保持学报》2014年第3期14-18,共5页Journal of Soil and Water Conservation

基　　金：国家林业公益性行业科研专项"天然林保护等林业工程生态效益评价研究"(201304308)

摘　　要：以晋西黄土区相同林龄的刺槐×侧柏混交退耕林地为研究对象,以农地和荒草地为对照,采用野外实地放水冲刷法,以地表径流的泥沙含量为指标,对刺槐×侧柏混交退耕林地的土壤抗冲性进行研究,分析坡度、枯落物、生物多样性对土壤抗冲性的影响以及相关关系。结果表明:刺槐×侧柏混交退耕林地的土壤抗冲性强于农地与荒草地的土壤抗冲性;坡度是影响刺槐×侧柏混交退耕林地土壤抗冲性的重要因子,土壤抗冲性随坡度的增加而减弱;相同坡度下,有枯落物的退耕林地土壤抗冲性强于去除枯落物的退耕林地,去除枯落物的退耕林地土壤抗冲性明显强于农地,退耕林地的土壤抗冲性随枯落物厚度的增加而增强;生物多样性对退耕林地的土壤抗冲性有显著影响,土壤抗冲性随多样性指数的增大而增强;坡度、枯落物、生物多样性与土壤抗冲性呈显著相关,相关性系数由大到小为生物多样性>坡度>枯落物。Took soil anti-erosion of same age grain for green mixed forest of Robinia pseudoacacia and Platycladus orientalis as object of research and took farmland and grassland as reference. Using in suit artificial eroding trial, sediment yield of surface runoff was set as a measurement index to discuss soil anti- erosion of grain for green mixed forest of Robinia pseudoacacia and Platycladus orientalis. The influence of slope, litter and biodiversity on soil anti-erosion and the correlation between them were discussed respectively. The results showed that： Soil anti-erosion of grain for green mixed forest of Robinia pseudoacacia and Platycladus orientalis was stronger than that in farmland and grassland. Slope was an important factor affecting soil anti- erosion of grain for green mixed forest, soil anti-erosion weakened with increasing slope. On the same slop, soil anti-erosion of grain for green mixed forest with litter was greater than that in forest land without litter, which was also greater than farmland, the soil anti-erosion of grain for green mixed forest rose as litter thickness increasing. Moreover, soil anti-erosion increased with the increase of diversity index. There was a clear correlation between slope, litter, biodiversity and soil anti-erosion, the magnitude of correlation coefficient was as follow： Biodiversity 〉slope 〉litter.

关 键 词：土壤抗冲性 退耕林地 坡度 枯落物 生物多样性 相关性 

分 类 号：S157.1[农业科学—土壤学]