土壤性质空间变异是一种普遍现象，但等高绿篱——坡地农业复合系统中土壤性质空间变异的研究较少。本文以设置在三峡库区王家桥小流域的香根草（Vetiveria zizanioides）绿篱试验小区为研究对象，从径流小区尺度探讨了不同措施对土壤性质空间变异的影响。结果表明，绿篱种植可降低O．2～0．002mm粒级团聚体的空间变异，绿篱＋有机肥与绿篱＋无机肥措施可降低〈0．002mm粒级团聚体的空间变异，绿篱＋覆盖措施能降低0．2—0．002mm粒级团聚体的空间变异。绿篱种植可降低土壤有机碳、全氮、全磷、速效磷养分空间变异。施肥措施对系统内土壤养分空间变异影响不同，绿篱＋有机肥措施增大了全磷、速效磷的空间变异，绿篱＋无机肥措施增大了速效钾的空间变异。%Spatial variation of soil properties is a common phenomenon. However, rare research has been conducted for the contour hedgerow intercropping system. In this study, we investigate the effects of different agricultural measures on the spatial variation of soil properties at runoff plot scale planted with Vetiveria zizanioides hedgerow at the Wangjiaqiao Watershed in the Three Gorges Region. The results show that planting hedgerow reduces the spatial variation of 0.2 - 0. 002 mm fraction aggregates. Application of hedgerow ＋ organic fertilizer or hedgerow ＋ chemical fertilizer reduces the spatial variation of 〈 0. 002mm fraction aggregates. Hedgerow ＋ mulch reduces spatial variation of 0.2 - 0. 002 mm fraction aggregates. Planting hedgerow reduces the spatial variation of soil nutrients including organic carbon, total nitrogen, total phosphorus and available phosphorus. Fertilization measures, however, have different effects on the spatial variation of soil nutrients. Hedgerow ＋ organic fertilizer increase the spatial variation of total phosphorus and available phosphorus. Hedgerow ＋ chemical fertilizer increases the spatial variation of available potassium.
展开▼
