植物篱对石灰土坡耕地理化性质及磷素流失的影响

在三峡库区香溪河流域典型石灰土坡耕地通过修建标准径流小区,设置栀子花(灌木)和黑麦草(草本)植物篱,研究不同类型植物篱对石灰土坡耕地耕层土壤理化性质及磷素流失特征的影响。结果表明:植物篱系统可有效的增加土壤耕层细颗粒含量和减小土壤容重,从而改善土壤分形特征,增强土壤疏通性及含水量,达到增大石灰土坡耕地土壤抗蚀性指数和防治土壤养分流失的目的;2种类型植物篱在不同深度耕层、植物篱带内和带间对石灰土坡耕地理化性质及磷素流失的影响表现出一定的差异性,但总体上差异不显著;土壤耕层黏粒含量与土壤中Ca_8-P、Al-P、Fe-P、O-P和Ca_(10)-P的含量均达到了极显著正相关(r=0.772,0.805,0.603,0.682,0.738),土壤容重与土壤黏粒含量存在显著的负相关关系(r=-0.648),表明植物篱系统是通过对土壤黏粒的有效阻滞和富集,从而减小石灰性土壤容重和磷素的流失,实现改善石灰土坡耕地土壤理化性质和防治农业面源污染的效果。

Effects of Hedgerows on Physical and Chemical Properties and Phosphorus Loss in the Lime Soil Slope Farmland

The standard runoff plots with hedgerows of gardenia (shrubs) and ryegrass (herbaceous) were set up to study the effects of different hedgerows on soil physicochemical properties and on the characteristics of phosphorus loss in the typical lime soil slope farmland in Xiangxi River Basin of Three Gorges Reservoir are-a.Results showed that the hedgerows system could effectively increase the fine particles content in soil and reduce bulk density,so as to improve soil fractal characteristics.It could also enhance soil dredging and water content,and finally increase the soil corrosion resistance index Prevention and control soil nutrient loss.The effects of two hedgerows on soil physicochemical properties and phosphorus loss varied in different soil depths and different intercropping zones in the lime soil slope farmland,but the effects were not significant.The contents of Ca8-P,Al-P,Fe-P,O-P and Ca10-P in soil were significantly correlated with soil clay contents (r =0.772,0.805,0.683,0.682,0.738).There was a significant negative correlation between soil bulk density and clay contents (r =-0.648),indicating that the hedgerows system could reduce soil bulk density and phosphorus loss through effectively blocking and enriching soil clay particles,to achieve the improvement of soil physicochemical properties and controlling of agricultural non-point source pollution in lime soil slope farmland.