沙坡头地区人工林生态系统健康的评价分析

Evaluation and analysis about ecosystem health of artificial plants in Shapotou aera

生态系统健康是生态环境管理的一个新问题.健康的生态系统意味着生态系统能正常发挥功能,实现生态系统的最佳服务.生态系统健康可以通过活力、组织和恢复力3个特征来测定.以沙区植物为研究对象,选择植物的新生枝长、株高、基径、冠幅和水分生态位适宜度等,作为评价生态健康的主要指标,建立了新的评价方法.依据试验进行计算,结果表明:油蒿与柠条混播下,具有较高的健康指数;单播情况下,以密度为2500株/hm2的柠条样地具有较高的健康指数.该结果为沙区人工植被生态健康与可持续发展提供定量依据.

Ecosystem health is a new problem of ecological environmental management.A healthy ecosystem means that it can exert function normally and realize the best services of ecosystem.Ecosystem health can be surveyed by three characteristics:vigor,organization,resilience.Taking plants in sandy area as objects for research,new branch length,plant height,ground diameter,crown scope and moisture niche fitness of plant are chose as main indicators to evaluate ecosystem health,and a new assess method is set up.The results indicate:under the mixculture of Artemisia ordosica and Caragana korshinskii,there is higher health index;in other sample spots,there is higher health index in spot with density of 2 500 plant/hm2.It will present quantitative basis for ecosystem and sustainable of artificial vegetation.