共和盆地草原沙漠化的正、逆过程与植被演替规律

共和盆地地处半干旱地区, 地带性植被为荒漠草原和草原类型。由于气候波动周期漫长, 现阶段草原沙漠化正、逆过程的趋向, 主要取决于人为因素。大气圈、生物圈和岩石圈相互作用的结果, 使得沙漠化正、逆过程中不同发展阶段都有显著的特征。其中植被是最敏感和最直观的标志。讨论植被演替的系列和规律, 实质上就是讨论沙漠化的正、逆过程。

Developmental and Adverse Processes of Steppe Desertification and Law of Vegetation Succession in Gonghe Basin

The zonal vegetations of the semiarid Gonghe Basin are desert steppe and steppe type. The trends of the developmental and adverse processes of desertification, due to the long period of climatic fluctuation, are fully decided dy human factors at present. The interaction of atmosphere, biosphere and lithosphere results in the marked characters of various developmental or adverse stage of desertification, of which vegetation is the most sensitive and intuitional feature. Therefore, the discussion about series and law of vegetation succession is essentially the study of developmental and adverse processes of desertification.