大凌河流域不同治理措施对土壤抗冲性能的影响

Influence of Different Control Measures of Dalinghe River Basin on Soil Anti-scourability

为提高北方石质山区小流域综合治理效益,提高关键治理技术措施的科学性和有效性,本文以大凌河流域为研究对象,通过对具有代表性的样地进行调查,并采取现场抗冲性试验和实验室样品采取处理的方法,对采取不同治理措施的土壤物理性质、抗冲性和土壤质地进行研究分析。结果表明:各类治理措施对土壤密度、总孔隙率和毛管孔隙率均有所改善,土壤密度随土层的加深而增大,深层土质的土壤总孔隙率和毛管孔隙率较低,而非毛管孔隙度规律性不明显;在一定程度上改善了土壤透气性能,提高了土壤抗冲性能,增大了降雨径流时间,减少了水土流失危害;土壤抗冲性与土壤中细、中粉粒体积分数呈正相关性,而与非毛管孔隙率呈负相关性。

In the paper,Dalinghe River Basin is adopted as the research object,typical sample area is investigated,site anti-scourability resistance test and laboratory sample processing methods are adopted,soil physical properties,anti-scourability and soil texture of different control measures are studied and analyzed in order to improve the comprehensive treatment efficiency of small watershed in northern rocky mountains,and improve the scientific nature and effectiveness of key treatment technology measures.Results show that various control measures improve the soil density,total porosity and capillary porosity,the soil density is increased with the deepening of the soil layer,the soil total porosity and capillary porosity of deep soil are low,the non-capillary porosity regularity is not obvious,the soil permeability is improved to a certain extent,thereby improving the soil anti-scourability,increasing rainfall runoff time,and reducing the damage of soil erosion.The soil anti-scourability is positively correlated with soil medium fine and medium power particle volume fraction,which is negatively correlated with non-capillary porosity.