在快速城市化进程中，受到自然和人为因素的综合影响，区域环境演变过程和影响因素更加复杂。
During the rapid urbanization, the process of the regional environment change becomes more complex due to the combined influence of natural and human factors.
根据野外调查与遥感解译结果，结合前人的研究资料，论述了若尔盖高原草原沙化的自然因素和人为因素。
This paper mainly analyzes the natural and anthropogenic causes of grassland desertification in the Ruoergai Plateau using the method of remote sensing and field investigation.
河流泥沙是流域内各种自然因素和人为因素综合作用的反应，与河道本身冲淤变化密切相关。
River sediment yield is the reaction of various natural factors and human action factor comprehensive role in basin, wash with sedimentation of river course to change, is related closely.
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