摘要
采用野外调查与室内分析相结合的方法,把4种农作物引入复合种植模式中,以土壤可蚀性K值、径流量、侵蚀量为指标,对紫色土区不同复合种植模式与水土流失特征的关系进行分析和研究。研究结果表明:(1)与单一的种植模式相比,不同复合种植模式使水土流失敏感性增强,K值增大,土壤容易被侵蚀。(2)土壤可蚀性K值与土壤砂粒含量呈极显著负相关,相关系数为-0.957;与土壤黏粒含量、有机C含量呈负相关,相关系数分别为-0.191,-0.637;与粉粒含量呈显著的正相关,相关系数为0.986。黏粒及有机质含量的高低是反映紫色土区土壤抗侵蚀能力强弱的有效指标。(3)与柚子纯林种植模式相比,复合种植模式的径流截留效益显著。综合各项指标发现,柚子—粉葛复合模式抗侵蚀效果最好,最适宜推广种植。
In combination of field investigation with laboratory analysis,the relationships between multiple cropping and soil and water loss in the purple soil region were analyzed using soil erodibility Kvalue,runoff and erosion amount as indicators.Results showed that：（1）In contrast to single cropping pattern,the different cropping modes enhanced the sensitivity to soil and water loss,increased soil erodibility Kvalue and made soil to be eroded more easily.（2）The K value had a significantly negative correlation with sand content,with a correlation coefficient of-0.957.It was negatively correlated with clay content and organic C content,with correlation coefficients of-0.191and-0.637,respectively.The Kvalue had a significant positive correlation with silt content,with a correlation coefficient of 0.986.The levels of organic matter content and clay content were the sound indexes reflecting the resistance to erosion for purple soil.（3）Compared with the grapefruit pure cropping pattern,the runoff interception efficiency by multiple cropping was significant.The multiple cropping pattern of grapefruit and Pachyrhizua angulatus has the best effect in controlling soil erosion and thus is most suitable for application.
出处
《水土保持通报》
CSCD
北大核心
2013年第3期38-43,共6页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"植物篱配置模式对三峡库区面源污染控制机理研究"(40971166)
国家科技支撑计划项目"坡地埂-路-沟-池工程配套技术集成规范"(2011BAD31B03)
关键词
紫色土区
复合种植模式
K值
径流量
侵蚀量
purple soil region
multiple cropping
Kvalue
runoff
erosion amount
