退耕还林还草区坝地土壤理化性状分布特征分析

黄土高原淤地坝坝地高效利用是巩固该区退耕还林还草成果的重要手段之一。以泾河流域一级支沟纸坊沟流域坝地为试验基地，对坝地土壤水分、土壤层次间有机质、全氮、全磷及速效养分差异等理化性状进行了分析。结果表明，与作物生长关系密切的速效养分平均含量表现为高龄坝地〉低龄坝地〉梯田〉荒坡地；从土壤剖面及不同取土部位看，层次间有机质、全氮、全磷及速效养分差异较小，土层中速效养分的供给能力更具持久性。坝地淤积泥沙更易富集速效养分，表明坝地具有较大的增产潜力。

Soil Physical and Chemical Properties of Check-Dam-Induced Land in Returning Farmland to Forest and Grassland Area

Efficient utilization of check-dam-induced land is one of the important ways to keep the sustainable development of the conversion of arable land into grassland or forestland on the Loess Plateau.An investigation was launched to check soil moisture,organic matter,total nitrogen,and total phosphorous,as well as soil available nutrients in the soil profiles of the check-dam-induced land in Zhifang watershed,the first tributary of Jinghe River.Results showed that land types,in terms of the level of soil availa...