甘家湖典型防风固沙林健康评价

Health evaluation of typical windbreak and sand-fixation forest in Ganjiahu

防风固沙林是干旱半干旱地区生态安全屏障的重要组成,对其健康状况进行评价,可为防风固沙林经营和管理提供科学依据。以甘家湖地区防风固沙林为研究对象,使用样方调查和室内实验分析相结合的方法,选取4个一级指标和17个二级指标,采用生态系统健康指数模型对防风固沙林健康状况进行评价。结果显示,甘家湖防风固沙林整体健康状况良好,其健康指数范围在0.53—0.93之间,均值为0.77,样方中:6.82%为“优质健康”状态,47.73%为“健康”状态,38.64%健康状态为“一般健康”,6.82%健康状态为“差”。不同类型防风固沙林健康状况排序为:梭梭林>胡杨林>混交林>柽柳林。今后应加强管护,保证防风固沙林健康发展。

Windbreak and sand-fixation forests maintain the stability of ecosystem in arid and semiarid area.Evaluating its health status could provide scientific support for forest protection and management in arid and semiarid area.Combined field survey and laboratory analysis,4 categories and 17 secondary indicators were respectively selected;ecosystem health index model was used to evaluate the health of the windbreak and sand-fixation forest in Ganjiahu.The results showed that as a whole,the windbreak and sand-fixation forest in Ganjiahu was in good health;the HI value ranged from 0.53 to 0.93 and the mean value was 0.77.6.82%quadrats were in quality health status,47.73%quadrats were in health status,38.64%quadrats were in general health status and 6.82%quadrats were in unhealthy status.The order of health status in different types of the windbreak and sand-fixation forest was Haloxylon ammodendron forest>Populus euphratica forest>mixed forest forest>Tamarix chinensis forest.The windbreak and sand-fixation forest should be managed and protected well and its health level should be enhanced in future.