开垦对西北干旱区荒漠土壤养分含量及主要性质的影响——以甘肃省临泽县为例

本文选择开垦年限约为10年的耕地及自然状态下的荒地作为研究对象,对比分析了开垦对荒漠土壤养分含量以及pH、阳离子交换量的影响。结果表明:荒地开垦为农田后,土壤剖面有机碳、氮、磷、钾含量、CEC、C/N均有不同程度的升高,pH值有所下降;表层土壤受耕作的影响程度大于下层土壤。开垦后土壤0-15cm有机碳增加了359%;全氮增加了367%、全磷增加了47.5%;速效养分也有一定程度的增加,且增加的幅度大于全量。总体来说,耕作活动增加了荒漠土壤养分,在一定程度上改善了土壤质量。

Effects of Cultivation on Nutrient Contents and Main Properties in Desert Soil of Northwest Arid Region——A Case Study in Linze County of Gansu Province

This research is aimed to study the effects of cultivation on nutrient contents and main properties of desert soil in northwest arid region.The soil samples were collected from several wastelands and farmlands which cultivation periods were about 10 years.The results showed that: When the wilds were cultivated,the organic carbon,nutrient contents,CEC and C/N increased to a extent,and pH delined.The topsoil was affected more than the subsoil.The organic carbon of 0-15cm increased 359%.The nitrogen content increased 367%.The phosphorus content increased 47.5%.The quick effective nutrient contents increased.The measures of increasing were more than the full contents.As a whole,the cultivation increased the nutrient of desert soil,and improved the soil quality.