孕源断链在土地沙漠化防御技术中的实践剖析

基于灾害的链式理论对现今土地沙漠化问题进行了分析,指出土地沙漠化无论在成因上还是在危害性的表现结果上都呈现出复杂的链式效应,并依据灾害链式效应指出不合理耕作、开采地下水、砍伐树木、过度放牧及日益恶化的生态环境是形成土地沙漠化灾害链的源头因素.根据孕源断链的治灾思路,提出治理沙漠化应从其孕育初期的源头上控制灾害蔓延,切断灾害传播链,并从工程实践入手对其成效进行剖析。

Application of Chain-cutting Disaster Mitigation from Gestation Source to Preventing Land Desertification

Land desertification at present was analyzed on the basis of the disaster chain theory.The cause of formation and the hazardness of land desertification presented a chain-form,and the source factors of disaster chain-form in land sandy desertification were revealed.And the factors includes illogical cultivating,groundwater overdraft,excessive felling,over grazing and the deteriorating ecological environment.According to chain-cutting disaster mitigation from gestation source,the mode of controlling spread of land desertification from the headstream was developed.The effects of the mode mentioned above were discussed in practice.