Title: Studies on Evolution of Natural Grassland Vegetation for 40 Years of Huan County in Gansu
Abstract: The Huan County is situated at the north of the Loess plateau of Gansu eastern. The area is 9 326 km2. The natural vegetation is situated at the regions transition from forest-steppe to desert-steppe. The comparative studies on natural grassland vegetation at 40 years ago and present have been made. Under the influence of nature factor and human activity together, the evolution results of natural grassland vegetation are as follows. The natural distributed original vegetation is replaced almost by secondary vegetation. The vegetation constitute tend to simplify, the formation of arbor and shrub natural grown disappeared. The typical zone formation of stipa brevi-flora, stipa bungeana, and stipa grandis vanished, and some of formation distributed small area faded out. The dominant species of each formation and the ecological characters of vegetation changed, and ecological function reduced. The natural grassland vegetation is serious degeneration, and the main reason caused those is human activities, that is cultivate, felling with axe, and excess graze,not the natural factors.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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