新疆昌吉州草地生产力年际动态分析

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

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。

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.