板栗林地水土保持截水工程措施对土壤特性的影响

通过采集浙江省安吉县2种典型板栗林不同坡面位置表层土壤样品,分析有无截水工程措施板栗林土壤特性之间的差异.结果表明：坡面截水工程措施对板栗林沟间坡面土壤性质没有明显的改善作用,其土壤有机质、速效钾和有效磷质量分数分别比无措施板栗林低5.88％、6.68％和33.54％,砂粒质量分数比无措施板栗林高10.57％.板栗林侵蚀地坡度的急剧变化导致坡面不同位置土壤养分和土壤颗粒组成的明显变化,2种板栗林坡度增加段土壤养分质量分数低,土壤砂粒质量分数相对较高;而坡面截水工程措施使得坡面土壤颗粒组成相对稳定,但要改善林地土壤肥力还必须与其他水土保持措施相结合.

Effects of intercepting ditch on slope on soil characteristics in artificial forests of Castanea mollissima

Based on the topsoil samples at different slope positions under two artificial forests of Castanea mollissima in Anji County of Zhejiang Province,the difference of soil characteristics under the artificial forests of C.mollissima with and without intercepting ditch engineering measures was analyzed.The results indicated that intercepting ditch measure had no obvious improvement on the contents of nutrients in topsoil.Compared with the forest without intercepting ditches,contents of soil organic matters,available potassium and available phosphorus were 5.88％,6.68％ and 33.54％ lower in the forest with intercepting ditches,respectively; in contrast,the content of sand was 10.57％ higher.In the eroded forest of C.mollissima,the sharp change of slope led to significant changes of contents of soil nutrients and soil particles composition.Contents of soil nutrients were lower and the amount of sand was relatively higher at steep slope areas in both forests.However,compositions of topsoil particles were relatively stable in the artificial forest of C.mollissima with intercepting ditch measures.To improve soil fertility,other soil and water conservation measures should be applied.