应用生态学报2011，Vol.22Issue(5)：1121-1126,6.
雅鲁藏布江中游河谷风沙化土地砂生槐群落结构特征
Structural characteristics of Sophora moorcroftiana community on wind-sandy land in middle reaches of Yaluzangbu River
摘要
Abstract
Based on quadrat investigation and hierarchical cluster analysis, this paper studied the structural characteristics of Sophora moorcroftiana community at its different restoration succession stages on the wind-sandy land in middle reaches of Yaluzangbu River. The plant community on the wind-sandy land could be divided into 6 types, i. e. , S. moorcroftiana community, Orinus thoroldii community, S. moorcroftiana＜O. thoroldii community, S. moorcroftiana-O. thoroldii community,Artemisia weiibyii+S. moorcroftiana community, and S. moorcroftiana+A. weiibyii community. The restoration succession began with the sand-fixing S. moorcroftiana distributed on moving dune, followed by O. thoroldii invasion . and then. S. moorcroftiana-O. thoroldii community formed gradually. Another restoration succession approach began with O. thoroldii community, S. moorcroftiana occurred then. and finally, S. moorcroftiana-O. thoroldii community formed. On semi-fixed dune.A. weiibyi could invade the community, and S. moorcroftiana+A. weiibyi community formed. The climax community on the wind-sandy land was the shrub community dominated by S. moorcroftiana. With increasing slope grade, the coverage and height of S. moorcroftiana community tended to decrease. Biological crust had definite improvement effect on the soil physical and chemical properties. At the places with biological crust, surface soil water content was significantly higher, compared with that at the places with other restoration succession stages of S. moorcroftiana community.The crown diameter, plant height, and the sprouting branch number of S. moorcroftiana community were the highest on moving dune, followed by on fixed dune. and on semi-fixed dune. The dead branch number at different restoration succession stages indicated that S. moorcroftiana population had a declining trend after the sand was fixed.关键词
雅鲁藏布江中游/风沙化土地/恢复演替/砂生槐/群落结构分类
生物科学引用本文复制引用
杨兆平,沈渭寿,孙明,孙俊,李海东..雅鲁藏布江中游河谷风沙化土地砂生槐群落结构特征[J].应用生态学报,2011,22(5):1121-1126,6.基金项目
国家环保公益性行业科研专项(200809010,200909050)资助. （200809010,200909050）
