摘要
利用EPIC公式计算了不同开垦和退耕年限的土壤可蚀性K值,对黄土高原典型自然恢复区子午岭林区土地退化/恢复过程中土壤可蚀性的动态变化进行了系统的研究。结果表明:土地开垦后,土壤颗粒向粗骨化方向发展,有机碳含量降低,土壤可蚀性逐渐增强;土地退耕过程中,土壤有机碳含量逐渐增加,肥力水平提高,可蚀性逐渐减小;土壤中有机碳含量、全氮含量、水稳性团聚体含量以及团聚度与土壤可蚀性K值相关最为密切;土壤可蚀性的强弱本质上取决于土壤有机碳含量,恢复植被以提高土壤有机质含量,促进土壤团聚体的形成,增强土壤团聚度,是降低土壤可蚀性能的重要途径。
The values of soil erodibility K under different degradation and restoration periods were calculated by the EPIC model and the dynamic changes of soil erodibility during the process of land degradation and restoration were systematically studied.The results showed that after cultivated,soil particles developed towards coarseness and organic matter contents was decreased,while during the periods of restoration,soil erodibility was decreased with the increasing of SOM gradually.K values were closely correlate...
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第2期56-61,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点基础研究发展计划项目(2007CB407206)
“十一五”国家科技支撑项目(2006BAD09B02)
西安理工大学优秀博士生科研基金(2007-210009)
关键词
可蚀性
动态变化
土地退化
土地恢复
soil erodibility
dynamic changes
land degradation
land restoration
