江河源区的生态环境地位初探

为了客观评价江河源区生态环境的重要性,提出了“生态环境地位”的概念,并从区内、青藏高原、黄河与长江流域3方面进行了分析。结果表明,江河源区是青藏高原的重要组成部分,其独特的生态环境是当地生物和居民赖以生存的基础,同时参与青藏高原独特的水文循环及对全球气候和环境的影响;黄河与长江流域的水资源分布受青藏高原的影响,江河源区对黄河流域的贡献主要体现在水量上(48.3%),而对其泥沙及长江流域的水量(1.8%)和泥沙量的输出影响均较小。因此,应正确对待江河源区的生态环境地位,不应夸大局部作用,仍需关注其独特性与变化。

Environmental Status of the source regions of Yangtze,Yellow and Lancang Rivers

To evaluate the importance of the environment of the source regions of Yangtze,Yellow and Lancang Rivers,"environmental status" was put forward to give an impersonal remark on the research region's environment.Inside the research region,its inimitable environment is vital for its creature and people.As the important component of Qinghai-Tibetan Plateau,it takes part in the atmospheric circulation and affects the global climate and environment,which can't be done by itself without the whole Plateau.The distribution of water resource of Yellow River Valley and Yangtze Valley is affected by Qinghai-(Tibetan) Plateau.The source region of Yellow River plays its part in Yellow River Valley with providing 48.3 percent of the average annual runoff and little sediment.And the source region of Yangtze River plays its part in Yangtze Valley with providing 1.8 percent of the average annual runoff and little sediment.Therefore,the function of the research region's environment shouldn't be magnified,and the environment and its changes deserve much attention for its uniqueness and are important components of Qinghai-(Tibetan) Plateau.