Guizhou Karst Areas Of Wasteland Soil Properties And Environmental Effects

According to the geological physiognomy, climatic conditions and the actuality of desertificational development, in this research, karst desertification region was classified west, southwest, east and north as four investigation area This research applicated the way of typical analysis and combined with the current classified demarcation of rocky desertification to collect edaphic sample under different rocky desertification and different ecological background within four research region. This research analyzed the correlation ship between wasteland edaphic physical and chemical characteristics property and rocky developing process by analyzed the variation of edaphic physical property ,in order to investigate the ecological environmental effect of background value in karst rocky desertification region. The main conclusions have concluded as follows:(1)In the process of rocky desertification, higher percentage of sand but cosmid soil exist in grains extreme intensity rocky desertification, and the content show a descend trend with the development of rocky desertification. Moreover, the percentage of cosmid soil declined in the order of ecology which from woodland, lawn, plough to wasteland. The content of edaphic sand, coarse dust and cosmid are basically uniform in the eastern part and the southern part of Guizhou and the cosmid increased fallow with deepen of cross section.(2)In the process of rocky desertification, soil provided with low percentage of organic matter under serious erosion, with which the percentage of organic matter is higher in western area than it in southwestern region. The content of organic matter in different ecological style shows in correct order is woodland, plough, lawn and wasteland, and woodland content far more than plough, lawn and wasteland. Under the edaphic section of the organic matter in bedding plane content is far more than it in the B and C bedding plane. Moreover between B and C bedding plane, variational amplitude is week.(3)Edaphic nitrogen phosphorous and potassium, but active phosphorous express no variation law at different area of Guizhou, edaphic organic, nitrogen, phosphorous and potassium of wasteland in southwest is are more than which in west.(4)The content of woodland edaphic nitrogen is the highest in different ecological style, and the content of plough, lawn and wasteland are as follow. Additionally the regulation of phosphorous and potassium except active potassium shows that woodland content the most part and the. lawn, plough and wasteland are as follow.(5)Under the edaphic section, the content of nitrogen ,phosphorus and potassium show the law that woodland>lawn>plough>wasteland, in which the change of woodland are the most tempestuously under the edaphic section.(6) Edaphic cosmid correlate closely with organic, nitrogen, phosphorus and potassium. Edaphic organic correlate closely with nitrogen and phosphorus, and correlate normally potassium. There's no relationship beyond coarse dust and organic, nitrogen, and as the same beyond sand and organic, nitrogen.(7) It established a edaphic index of heath lands in Guizhou karst rocky desertification region. It is shows the orderliness that with the development of rocky desertification which beginning from inconspicuous extent to extreme degree each index present a obvious depressed tendency and the variation is faintness. The edaphic index of wasteland in Guizhou karst rocky desertification region could be considered as a edaphic judgment of nutrition of karst ecological environment.(8)During the process of abandoned time limit, the standard of edaphic physiochemical index has risen and its texture has gone well either. Under the natural condition, it is feasible to utilize wasteland after a period of recover, which call attention to us that we could recover wasteland with plants. Considered with both ecological environmental effect and agriculture economic effectiveness, we should utilize recovered wasteland properly.(9)Compared with other ecological style, the edaphic texture and the foundation of nutrientsubstance are the worst.(10)To renew the ecological environment of wasteland is such a process which is a lengthy natural succession. The reconstruction of ecological environment is of the most important thing which base on the renewing of ecological environment. As a result, we should take drastic measures to rebuilt environment while we resume it. We should commence improving the edaphic environment of wasteland, by recovering with lawn and woodland, wasteland; government ought to enhance the management of territorial utilization, in order to eliminate factitious breaks; to reinforce the propaganda and to impart generally the knowledge of rocky desertification effect and to adopt a serials of ecological reconstruction to complete the environmental recovering and rebuilding in karst rocky desertification region.