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中国沙漠 2007
Discussion on Ecological Effect and Reasonable Control of Sand-dust Storm
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Abstract:
Sand-dust storm is a natural phenomenon that happened in particular space and particular time,its happening frequency and intensity have been accumulated and strengthened under the excessive interference of mankind.People are very afraid of the harming of sand-dust storms.However,sand-dust storms also bring some important ecological effect on the global and regional eco-environment.They can promote the biogeochemical cycle of the global eco-system,redistribute and balance the productivity of the earth ecosystem,improve atmosphere environment, accelerate the biological breed disperse and the eco-system succession.We should not only pay attention to the harming of sand-dust storms in source region and passing routes,but also strengthen the study on the following aspects: the impact of sand-dust storms on energy flow,nutrient flow and communication flow of ecosystem;impact on vegetation restoration,crops cultivation and regional climate;the study on single pollution of sand-dust storm and the accumulated pollution caused by sand-dust storm and these cities that have pollution sources;the study on the balance point between sand-dust storm harming and its happening frequency,and the balance point between economic loss and ecological effect.Therefore,we should endue the scientific attitude on this phenomenon and carry through the ecological management rationally on the source regions,complete the action of ecological rehabilitation according that we can do it or not.In the paper,the ecotone of China is divided into three areas,that is,the ecological function area,the ecological rehabilitation area and the human habitation area.Thus we should adopt different ecological management measures.