土地整治年限对风沙土区土壤养分的影响

Effect of land consolidation history on soil quality of sand soil region

为研究土地整治对毛乌素沙地土壤质量产生的累积效应,本文采用空间代替时间的研究方法,以整治后不同种植年限的风沙土为研究对象,分别对整治后1年、3年和5年土壤剖面和表层养分的变化规律进行了探讨,对目前的土壤养分状况进行了评价。结果表明:不同整治年限,土壤剖面有机质和全氮的表聚特征明显;整治后1年土壤质量各指标的变化均不显著,整治后3年和5年,除有效磷外,其余指标均有显著提高,随整治年限增加,效果越来越明显。整治后土壤的肥力状况仍有待提高,建议采用科学的测土配方,增施有机肥,合理的轮作、少耕等培肥措施,缩短土壤熟化时间。

For the study of land reclamation on soil quality of Maowusu sandy land of cumulative effect,this article,adopting the research method of space instead of time,with different plantation age after the renovation of sand soil as the research object respectively,discussed changes of soil profile and surface nutrient after 1-year,3-year and 5-year reclamation.The results showed that:1)The surface accumulation characteristics of organic matter and total nitrogen in soil profile were obvious at different treatment years;2)The index of soil quality changes were not significant after 1-year renovation.Other indicators were significantly improved in addition to the effective phosphorus after three and five years renovation.With the increase of fixed number of year of the renovation,the effect is more and more obvious.3)Soil fertility remains to be improved after remediation.It is suggested to adopt scientific soil testing formula,increase the application of organic fertilizer,use rational rotation,less tillage and other fertilizer cultivation measures to shorten soil ripening time.