资源岛在草原灌丛化和灌丛化草原中的作用

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。

Resource islands and its roles in the thicketization of grasslands and thicketization-grasslands

In this paper the mechanisms of resource island formation in semiarid grasslands is reviewed.Thicketization 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 thicketization 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 related theory on resource islands is discussed.