摘要
根据1987年和1999年两个时相TM遥感影像解译成果,运用地理信息系统空间分析方法及数理统计方法,分析了陕北榆林地区1987～1999年间土地沙漠化程度和土地沙漠化时空分布变化特征,并对土地沙漠化原因进行了初步探讨。结果表明20世纪80年代后期以来,该区土地沙漠化进程整体上趋于稳定,并有所好转,这主要得益于当地政府对土地沙漠化的积极治理和有效政策。生态环境脆弱,气候干燥、多风是本区土地沙漠化的主要自然驱动因素,不合理的人类活动则是沙漠化的诱因。人为的积极治理措施可以有效控制沙漠化的进程。
According to the results of TM remote sensing image interpretat io n of two time phases in1987and1999and using the space analysis and ma thematic statistics of the geographic information system,the paper analyzes th e degree of land desertization and features of the temporal-spatial change of land desertiza-tion in the Yulin area,northern Shaanbei,in1987-199 9and discusses the cause of land desertization.The analytic results indicate that since the late1980s the process of the land desertization of the area as a whole has tended to be stable and taken a more or less favorable turn.Th is mainly benefits from the policies of active and effective control of land desertization implemented by the local government.The fragile ecologi-cal envi ronment ,arid climate and plenty of wind are main natural driving factors for land desertization,while irrational human activities are a factor of inducin g land desertization.Measures of active control and improvement can effectiv ely control the process of desertization.
出处
《中国地质》
CAS
CSCD
2002年第4期426-430,共5页
Geology in China
基金
中国地质调查局资助项目(200112300004)
