求翻译：2 新疆植被退化区域大多集中在天山北部地区；植被保持不变的区域大多集中在天山南部地区；植被改善区域大多集中在西南地区。3 降水、土壤类型和植被类型对NDVI的影响最大，气温、日照时数和DEM对NDVI的影响较大，其余因子影响较小。4 DEM增强了土壤类型对NDVI的影响；日照时数和DEM增强了气温对NDVI的影响。因此在NDVI监测中，日照时数和DEM可作为辅助指示因子。是什么意思？

2 Xinjiang region vegetation degradation are mostly concentrated in the northern Tianshan Mountains region ; vegetation remains constant region are mostly concentrated in the southern Tianshan ; improve vegetation are concentrated in the Southwest region .

2 Xinjiang degradation of vegetation areas are largely concentrated in mountains in the northern part of vegetation remain unchanged in most regions in southern Mountains region; vegetation improvement areas are largely concentrated in the southwest region. 3 precipitation, soil type, and vegetation

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