摘要
结合半干旱草原中资源岛的形成机制,讨论了草原灌丛化作为多年生禾草草丛资源岛不断解体,同时灌丛资源岛不断形成的过程。从草原灌丛化过程中灌丛内外土壤资源源-汇关系,说明灌丛资源岛作为土壤资源的汇而发生作用。灌丛资源岛的发育与草原灌丛化过程有着密切关系,并决定着灌丛化草原生态系统基本生态学过程,特别是初级生产的形成。探讨了灌丛资源岛理论对我国内蒙古典型草原灌丛化与灌丛化草原研究的重要意义。
in this paper the mechanisms of resource island formation in semiarid grasslands is reviewed. Thicketi zation of grassland is considered a deformation of a resource island under perennial grass tussock in conjunction with the formation of resource island under shrub-thicket. In terms of source-sink relationship in soil resources, the resource island under shrub patches acts as a sink for soil resources in the thicketizat;on of grasslands. The development of a shrub resource island is firmly related to thicketization of grasslands,and determines the basic ecosystem function,especially the primary productivity of thicketization grasslands. Finally, for research on the thicketization of steppe and thicketization-steppe in Xi-li River Basin, Inner Mongolia, the significance of the re lated theory on resource islands is discussed.
出处
《草业学报》
CSCD
2006年第1期9-14,共6页
Acta Prataculturae Sinica
基金
国家重点基础研究发展规划项目(G2000018603)资助
关键词
草原
资源岛
灌丛化
源-汇关系
生态系统功能
grassland
resource island
thicketization
source- sink relationship
ecosystem function
