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。

Analysis on the Physicochemical Properties of Soil of Dammed Land in Returning Farmland to Forest and Grassland Area

Efficient use of the Loess Plateau dammed land is consolidate the results of returning farmland to forest and grassland one of the important means.the test is base of the dammed land of Zhifang Valley in Jin river,and analyzed the soil moisture,soil level between the organic matter,total nitrogen,total phosphorus and available nutrient,such as differences in physical and chemical properties.The results showed that with the close crop of available nutrient content of the average performance for advanced age dammed land> lowed dammed land > terrace> wasteland slopes;and from the soil profile in different parts of soil,between the level of organic matter,total nitrogen,total phosphorus and available nutrient,The discrepancy was less,in the soil available nutrient supply capacity of more persistent,dammed land silt and sediment accumulation more nutrients available,and showed that the dammed land have greater potential to increase production.