Small-scale vegetation dynamics in semi-arid steppe in Inner Mongolia

被引:15
作者
Zhang, W
Skarpe, C
机构
[1] NORWEGIAN INST NAT RES, N-7005 TRONDHEIM, NORWAY
[2] UPPSALA UNIV, DEPT ECOL BOT, S-75236 UPPSALA, SWEDEN
关键词
Artemisia; ecotones; biomass; density; grazing; patch dynamics; steppe; semi-arid;
D O I
10.1006/jare.1996.0122
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Small-scale vegetation dynamics were followed for ecotones and in uniform stands in Artemisia-dominated steppe vegetation under grazing and when recovering from heavy grazing. Species composition was followed annually for 5 years in 1 m(2) and 0.25 m(2) plots for (1) presence-absence; (2) density; and (3) biomass. More rapid Vegetation dynamics, in terms of change of type of vegetation and distance moved in DCA species space between sampling occasions, were observed in smaller plots and in early seral stages, where species were few and alpha diversity low. Only the plots recently protected from grazing showed a directional vegetation change; those protected for more than 3 years and those under continued grazing showed, at this scale, non-directional dynamics. (C) 1996 Academic Press Limited
引用
收藏
页码:421 / 439
页数:19
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