新疆昌吉州草地生产力年际动态分析

通过对新疆昌吉州草地生产力2006~2010年5年监测结果显示:各草地类型植被不同程度退化。植物种类减少,草群结构单一,优势种出现频率很低,一年生和短命植物比例增加,中山带毒害草(醉马草)大量出现;草层高度不同程度下降。除山地草甸外,高寒草甸、草甸草原、典型草原和荒漠草层高度下降明显,下降幅度都超过了10%;植被覆盖度降低。除荒漠外高寒草甸、山地草甸、草甸草原、荒漠草原和低地草甸下降明显,下降幅度都超过了10%;草地生产力不同程度下降,在2009~2010年草地生产力有所上升。

Analysis on annual variation of rangeland productivity in Changji Prefecture of Xinjiang

The rangeland monitoring data from 2006 to 2010 indicated that the vegetation of all rangeland types was under degradation in general.It showed a situation of low plant species number,simple community structure,low frequency of dominants,increasing of annual and short-lived plant species,and increasing of poi-son grasses in middle mountains,decreasing of grass height.The height of vegetation communities of alpine meadow,meadow steppe,steppe and desert height decreased by more than 10% except mountain meadow.And the coverage also decreased.The coverage of alpine meadow,mountain meadow,meadow steppe,desert steppe and lowland meadow decreased by more than 10% except desert.The rangeland productivity decreased to differ-ent degrees,however,it increased from 2009 to 2010.