干旱区生态环境知识资源中心(Arid): 荒漠化草原植被斑块分布对地表径流、侵蚀及养分流失的影响

Arid

	荒漠化草原植被斑块分布对地表径流、侵蚀及养分流失的影响
其他题名	Effects of Vegetation Patchy Distribution on Runoff,Erosion and Nutrients Loss in Desertified Steppe Area
	李小军 1; 汪君 2; 高永平 1
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2011
卷号	31 期号:5 页码:1112-1118
中文摘要	地表径流是干旱区水、养分和土壤物质迁移和再分配的主要途径之一,它在很大程度上受植被格局的影响。研究了腾格里沙漠东南缘生物土壤结皮斑块和灌丛斑块镶嵌分布的植被格局对地表径流、侵蚀及其驱动下的资源再分配的影响。结果表明,植被斑块对地表径流和侵蚀产物起着拦截作用,能显著减少资源的流失。生物土壤结皮斑块和植被斑块之间存在资源(径流、侵蚀产物及养分等)再分配的源-汇关系。模拟降雨条件下,含有灌丛斑块和生物土壤结皮斑块的样方出现表面积水和径流需要的时间均显著大于只含生物土壤结皮斑块的样方;含两类斑块的样方出现径流需要的降雨量显著大于只含生物土壤结皮斑块的样方。在模拟降水和自然降水条件下,生物土壤结皮斑块产生的径流、侵蚀产物、有机质、氮及溶解养分中均大量被位于下坡向的灌丛斑块截获;灌丛斑块土壤水分入渗深度显著大于结皮斑块。灌丛斑块对生物土壤结皮斑块产生的地表径流、侵蚀产物及其携带的资源的捕获能显著减少资源流失,有效地防止荒漠化的进一步发生发展。
英文摘要	Runoff is the dominant pathway of water,nutrients and soil materials transfer and redistribution in arid land, which is strongly affected by vegetation pattern. The influences of the mosaic distribution of biological soil crust patches and spot-structured shrub patches in desertified steppe area in southeast fringe of Tengger desert on runoff,soil erosion, sedimentation and related resources redistribution were investigated. The results show that vegetation patches could obstruct the runoff and sediment,which inevitably leads to the reduction of resources losses. There is a source-sink relationship for resource (water,sediments and nutrients) redistribution between the biological soil crust patch and shrub patch. Under the simulated rainfall condition,the time of ponding and runoff commencement in the plots consisting of both crust and shrub patches is significantly longer than those in the plot consisting of only crust patches; the volume of rainfall for runoff commencement of the former was remarkably greater than that of the latter. In simulated and natural rainfall events,the shrub patches effectively obstructed and captured the runoff and carried sediments,organic matter and nitrogen,etc,which are generated from the biological soil crust patch. The water penetration depth in shrub patches was significantly greater than that in crust patches. The resource capture of shrub patches effectively decreases resource leakage,which is beneficial to desertification prevention.
中文关键词	地表径流 ; 资源再分配 ; 斑块植被 ; 源-汇关系 ; 荒漠化草原 ; 腾格里沙漠
英文关键词	runoff resource redistribution patchy vegetation source-sink relationship desertified steppe Tengger desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:4311316
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227543
作者单位	1.中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 兰州, 甘肃 730000, 中国; 2.桂林林业学校, 桂林, 广西 541004, 中国
推荐引用方式 GB/T 7714	李小军,汪君,高永平. 荒漠化草原植被斑块分布对地表径流、侵蚀及养分流失的影响[J]. 中国科学院西北生态环境资源研究院,2011,31(5):1112-1118.
APA	李小军,汪君,&高永平.(2011).荒漠化草原植被斑块分布对地表径流、侵蚀及养分流失的影响.中国沙漠,31(5),1112-1118.
MLA	李小军,et al."荒漠化草原植被斑块分布对地表径流、侵蚀及养分流失的影响".中国沙漠 31.5(2011):1112-1118.