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| 乌梁素海流域植被指数时空演变与气候和土地利用状况分析 |
| Spatiotemporal Evolution of Vegetation Index and Analysis of Climate and Land Use Conditions in Ulansuhai Basin |
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| DOI： |
| 中文关键词: 归一化植被指数 干旱指数 时空演变 土地利用类型 乌梁素海流域 |
| 英文关键词: NDVI Aridity index Spatiotemporal evolution Land use types Ulansuhai basin |
| 基金项目:国家自然科学基金资助项目（52160022）；内蒙古机电职业技术学院重点基金资助项目（NJDZR2302）；内蒙古自治区教育科学研究“十四五”规划课题基金资助项目（NZJGH2023007）；内蒙古自治区“草原英才”工程青年创新创业人才基金资助项目（20220180） |
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| 中文摘要: |
| 基于遥感数据和气象数据，运用趋势分析、持续性分析、土地利用动态度和转移矩阵等方法，探讨1986—2021年乌梁素海流域植被覆盖时空演变与气候和土地利用状况分析。结果表明：研究期内流域气候整体偏向暖干化，归一化植被指数（NDVI）呈上升趋势，每10 a上升45%；2005年后干旱频率加快，同年NDVI值出现突变；流域NDVI年均值空间变化范围为0007~0848，腹地河套灌区最高，东部高于西部，空间分布差异显著；乌梁素海流域主要土地利用类型为草地和耕地，草地向耕地、建筑用地转移趋势明显。流域植被覆盖度具有下降态势，未来应加强生态修复管理工作，防止水土流失。 |
| 英文摘要: |
| Based on remote sensing and meteorological data， this study employed trend analysis， persistence analysis， land use dynamic degree， and transfer matrix methods to investigate the spatiotemporal evolution of vegetation coverage in the Ulansuhai basin from 1986 to 2021， as well as analysis of climatic conditions and land use patterns.The results indicated that the overall climate of the basin presented a warming and drying trend during the study period. The normalized difference vegetation index（NDVI） exhibited an increase of 45% per decade. The frequency of drought intensified after 2005， and an abrupt change in NDVI values occurred in the same year. The annual average NDVI of the basin ranged 〖GK!87mm〗spatially from 0007 to 0848， with the highest values in Hetao irrigation area in the hinterland. NDVI values were higher in the east than in the west，showing substantial spatial heterogeneity. Grassland and cultivated land constituted the dominant land use types in the Ulansuhai basin， with an obvious conversion trend of grassland to cultivated land and construction land. Vegetation coverage in the basin was projected to decline in the future. Therefore， 〖HK〗intensified 〖HK〗ecological restoration and management should be implemented to prevent soil and water loss. |
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