%0 Journal Article
%T A research review on “fertile islands”of soiIs under shrub canopy in arid and semi-arid regions<br>干旱和半干旱地区灌木下土壤“肥岛”研究进展
%A CHEN Guangsheng
%A ZENG Dehui
%A CHEN Fusheng
%A FAN Zhiping
%A GENG Haiping
%A <br>陈广生
%A 曾德慧
%A 陈伏生
%A 范志平
%A 耿海东
%J 应用生态学报
%D 2003
%I 
%X Due to the inclemency of climate and soil conditions and the intense disturbance of human beings,the soil resources heterogeneity in arid and semi arid grassland ecosystems worldwide was gradually increased during the last century. The interaction between soil heterogeneity and shrubs induced the autogenic development of "fertile islands" and the increasing spread of shrubs in the grassland ecosystems. The development of "fertile islands" around individual shrubs could change the vegetation composition and structure,as well as the distribution patterns of soil resources,and thus,reinforced the changes of the ecosystem function and structure from a relative stable grassland ecosystem to a quasi stable shrubland ecosystem. The study of "fertile islands" phenomenon would help us to understand the causes,consequences and processes of desertification in arid and semi arid areas. In this paper,the causes of "fertile islands",its study methods and significance and its relationship with shrub spreading as well as the responses of vegetation to it were summarized. The problems which might occur in the study of this phenomenon were also pointed out. Our aim was to offer some references to the study of land desertification processes and vegetation restoration in the arid and semi arid regions.
%K Shrub
%K Fertile islands
%K Spatial heterogeneity
%K Soil resources
%K Land desertification
%K Arid and semi
%K arid regions<br>灌木
%K “肥岛”
%K 土壤资源
%K 空间异质性
%K 土地荒漠化
%K 干旱、半干旱区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=A21E592A84B51CC6&yid=D43C4A19B2EE3C0A&vid=F3583C8E78166B9E&iid=59906B3B2830C2C5&sid=B6D9E422DA43753D&eid=9EFA9C0344D40E4A&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=16&reference_num=51