生态工程实施对羌塘和三江源国家级自然保护区植被净初级生产力的影响

Effects of ecological engineering on net primary production in the Chang Tang and Sanjiangyuan national nature reserves on the Tibetan Plateau

为了有效评估生态工程建设对青藏高原典型国家级自然保护区的影响,基于表征生态系统功能状况的植被净初级生产力变化系列数据,采用样区对比法系统分析了羌塘和三江源两个国家级自然保护区建立及2004/2005年实施的新生态工程的效果。研究表明:(1)1982–2009年间,在10组对比样区中有9组保护区内样区的草地净初级生产力呈波动上升的趋势;(2)2004年后新生态工程的实施效果良好,有8组对比样区生态状况转好;(3)在所有高寒草地类型中,新生态工程对高寒草甸类型样区的保护效果最为显著。

Long term series of remotely sensed imagery of net primary production （NPP） data could reflect ecosystem health. In this study, we employed NPP to evaluate the effects of ecological engineering （nature reserve and new ecological engineering in 2004 or 2005 techniques） by the sampling area comparison meth- od in the Chang Tang and Sanjiangyuan national nature reserves on the Tibetan Plateau. The results showed that： （1） among the 10 pairs of sampling areas, annual NPP of 9 pairs tended to increase between 1982 and 2009; （2） the new ecological engineering techniques improved the effectiveness of ecosystem conservation, with NPP in 8 pairs of sampling areas increasing faster than before; and （3） among all alpine grassland types, the new ecological engineering techniques remarkably improved the effectiveness of conserving the meadows.