禁牧对中度退化伊犁绢蒿荒漠草地土壤养分的影响  

Effects of grazing exclusion on soil nutrition in moderate degraded desert grassland of Seriphidium transiliense

作　　者：董乙强 孙宗玖[1] 安沙舟[1] 杨静[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,新疆草地资源与生态自治区重点实验室,新疆乌鲁木齐830052

出　　处：《草业科学》2016年第8期1460-1468,共9页Pratacultural Science

基　　金：国家自然科学基金项目(31260574,31160477)

摘　　要：为了探究荒漠土壤理化性质对禁牧的响应规律,以中度退化伊犁绢蒿（Seriphidium transiliense）荒漠草地为研究对象,采取野外取样与室内分析相结合的方法,对不同禁牧年限（0、1、4和11a）的荒漠草地土壤有机碳,全量和速效氮、磷、钾,pH,土壤含水量,容重进行测定分析,探讨草地恢复演替过程中土壤养分的变化规律。结果表明,随着禁牧年限的增加,土壤表层（0-5cm）有机碳、全氮、全磷、全钾、速效磷、速效钾均呈先降后升的变化趋势;与对照未禁牧相比,0-5cm土壤有机碳含量降低了11.9%~23.0%,5-10cm土壤全氮显著降低了31.3%~46.7%;禁牧11a后全磷、速效钾分别增加了8.5%,12.0%;全钾、碱解氮、速效磷无明显变化趋势;土壤含水量呈波动性增加,容重呈波动性下降趋势。In order to explore the response to grazing exclusion on soil physical and chemical quality, the influ- ences of different grazing exclusion times （including 0 year, 1 year, 4 year and 11 year） on soil organic matter, soil total nitrogen, total phosphorus, total potassium, alkali solution nitrogen, available phosphorus, available potassium, pH, soil moisture and bulk density in moderate degraded desert grasslands of Seriphidium transiliense in Xinjiang were studied by using the method of combination field survey with laboratory analysis. The results showed that the content of soil organic matter, total nitrogen, total phosphorus, available potassium substantially increased first and then decreased with the grazing exclusion times in the surface（0-5 cm）. Compared with continuous grazing areas, the content of soil organic matter decreased 11.9%-23.0%in 0 5 cm of soil layer and total nitrogen decreased 17.5 %-4.1% in 5-10 cm of soil layer; but the content of total phosphorus and available potassium respectively increased 8.5% and 12.0% in eleven years of grazing exclusion. In addition, the content of total potassium, alkali solution nitrogen, available phosphorus had no obvious significant. The soil moisture presented increased volatility, but soil bulk density presented decreased volatility.

关 键 词：禁牧年限 蒿类荒漠 土壤养分 

分 类 号：S812.2[农业科学—草业科学]