新疆北部绢蒿荒漠水源圈土壤养分的梯度变化

发布时间：2018-03-04 22:17

本文选题：水源圈　切入点：绢蒿荒漠　出处：《草地学报》2016年04期 　论文类型：期刊论文

【摘要】：由于干旱缺水,新疆北部绢蒿(Seriphidium)荒漠形成以饮水点为中心的定居放牧,导致水源圈大量出现。2014年5月底,以新疆木垒县天山北坡绢蒿荒漠一个典型的牧场水源点为中心,采集了东南西北4个方向和6个采样距离(50m,100m,200m,400m,800m和1200m)的土样,分析了土壤含水率、电导率、pH值以及土壤有机碳、土壤全量和速效养分变化特征。结果表明,随着离水源点距离的增加,土壤含水量、全钾和速效钾没有明显变化,土壤电导率、pH值、土壤有机碳、全氮、全磷、速效氮和速效磷的含量随着离水源点距离的增加而增加,说明放牧扰动强度的增加降低了土壤有机碳和土壤养分含量。结果说明,在新疆北部涓蒿荒漠,过度放牧导致水源点附近土壤养分明显减少,甚至枯竭。
[Abstract]:As a result of drought and water shortage, the desert of Seriphidium in northern Xinjiang formed settled grazing with drinking water point as its center, which led to the emergence of a large number of water sources. At the end of May 2014, it was centered on a typical pasture water source point in the northern slope of Tianshan Mountain, Muli County, Xinjiang. The soil samples were collected from 4 directions and 6 sampling distances of 50 m ~ 100 m ~ (100 m) and 100 m ~ (m) ~ (100 m) and 1200 m ~ (-1). The characteristics of soil moisture content, electrical conductivity, pH value, soil organic carbon, soil total amount and available nutrients were analyzed. With the increase of the distance from the water source, the soil water content, total potassium and available potassium did not change obviously. The soil electrical conductivity and pH value, soil organic carbon, total nitrogen, total phosphorus, available nitrogen and available phosphorus increased with the increase of the distance from the source point. The results showed that overgrazing resulted in significant decrease or even depletion of soil nutrients near the water source site in the desert of Artemisia annua in the north of Xinjiang.
【作者单位】：中国科学院新疆生态与地理研究所中国科学院干旱区生物地理与生物资源重点实验室;中国科学院大学;新疆石油学院基础科学系;
【基金】：科技部973项目(2014CB954204) 国家自然科学基金(31300390) 中国科学院西部之光西部博士项目(XBBS201309);中国科学院特聘研究员计划(2011T1Z42)资助
【分类号】：S158

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