武功山不同退化阶段土壤氮素和物理性质的变化规律  

Change of soil nitrogen and physical property in different degradation stages of meadow on Wugong Mountain

作　　者：赵自稳 郭晓敏[1,2] 潜伟平 牛德奎[1] 刘宇新[1] 李志[1] 胡耀文[1,2] 张文元[1,2] 

机构地区：[1]江西农业大学林学院,江西南昌330045 [2]江西农业大学江西省森林培育重点实验室,江西南昌330045 [3]萍乡市林业科学研究所,江西萍乡337000

出　　处：《广东农业科学》2015年第13期71-75,共5页Guangdong Agricultural Sciences

基　　金：国家科技支撑计划项目(2012BAC11B06);国家自然科学基金(30960312)

摘　　要：以江西省武功山草甸为研究对象,分析不同退化阶段对其土壤全氮、碱解氮和有机质的影响,结果表明:(1)武功山草甸土壤全氮、碱解氮和有机质含量均随着退化的加剧呈先升高后下降的变化,在轻度退化阶段含量最高,而在重度退化阶段含量最低,并且退化对氮素上层土的影响小于下层土,对有机质的影响是上层大于下层;(2)随着退化的加剧,土壤容重的逐渐增加但是土壤质量含水量逐渐减少;(3)重度退化导致各研究指标间失去显著相关关系。This research took the meadow in Jiangxi Wugong Mountain as research object, analyzed the influences of different stages of degradation on soil total nitrogen, alkaline hydrolysis nitrogen and organic matter. The results showed that： （ 1 ） The soil total nitrogen, alkaline hydrolysis nitrogen and organic matter contents of meadow in Wugong Mountain increased first and then decreased with increase of degradation , and was the higest in the lightly degraded stage, but was the lowest in severe degradation stage, and the degradation influence on nitrogen in upper layer soil was less than that in the lower soil, for organic matter, the upper layer soil was more than the lower soil. （2） With the increase of degradation, soil bulk density increased gradually but the soil quality and water content gradually decreased. （3） The severe degradation led to the loss of significant correlation among the nutritive indexes.

关 键 词：退化草甸 氮素 有机质 容重 含水量 

分 类 号：S153[农业科学—土壤学]