Feature Analysis And Recover Pattern Of Degenerate Grassland Of Source Region Of Yellow River

Feature analysis and recover pattern of degenerate Grassland of source regionof Yellow RiverWang li-ya(Gansu Agriculture University, 2000 graduate class)AbstractAlpine Grassland and Alpine Meadow are the main representative vegetation types in Yellow River source region. Alpine Grassland is composed by stipa purpurea, Poa annua , which are the preponderant vegetation of Alpine Grassland. Also, Alpine Meadow is composed by Kobresia pygmaea., which are the dominant vegetation of Alpine Meadow. Alpine Grassland and Alpine Meadow degenerate badly because of the human activity influence and environment changes in recent years. First, as for the degenerate Alpine Grassland in zhaling lake northern region of Yellow River source region, the vegetation cover-degree descent by 10%～55 % , the growth-power of dominant vegetation is bated , and its growth-period is postponed The dominant vegetation are replaced by stipa Compositae, Leguminosae gradually, and the species number of vegetation diminish by 5～17 (100m2). Although the distributive area of the Alpine Grassland is not very big, it plays an important role in ecological system. The Alpine Grassland is a brittle ecological system in alpine region. Its holding power of water is lower and there are lots of stones in its soil. The wind and water erode strongly, so this grassland degenerate easily and the comeback is very difficulty. Second, as for the degenerate Alpine Meadow in zhaling lake southern region of Yellow River source region, the cover-degree of vegetation descent. Its dominant vegetation are replaced by Potentilla anserine, Ligularia virgaurea gradually, and the species number of vegetation diminish by 6～18 (100m2). Because of the degeneration of Alpine vegetation which lead to the descent of the ecological function of vegetation colony, the ecological environment of Yellow River source region are deteriorating rapidly. The essential father and renewal measure must be based on the protection and construction vegetation of source region in Yellow River under the condition of the allowable carrying capacity of the ecological system and on the principle of the harmonization of the continual utilization with the exploitation, increment and protection of resource. According to the ecological standard, we should organize and mark out the stockbreeding production truthfully in certain district, assort livestock with environment and production with resource in order to provide the best natural man-made conditions. Based on the investigation and research in the source region of Yellow River, the author brings forward the recover pattern of degenerate grassland and high-effect stockbreeding of definitizing one goal, reinforcing the product programming, doing two project construction goodly, implementing the full integrity of science management and high-efficiency stockbreeding, exploiting the manpower resource fully, performing five system construction, coordinating four step. This pattern provides theory and practices gist for the father and renewal of the ecological environment of Yellow River.