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。
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.
森林、灌丛、草甸、草原到荒漠呈带状更迭。
The changes are manifested in belts from forest, bush, meadow and steppe to desert.
本项目鼓励以往开垦坡地上草原、树木和灌丛的自然再生。
The project encouraged natural regeneration of grasslands, tree and shrub cover on previously cultivated slope-lands.
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