| 那曲地区植被NDVI时空变化及成因分析 |
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| 引用本文： | 拉巴,洛桑曲珍,次珍,平措旺丹.那曲地区植被NDVI时空变化及成因分析[J].气象与环境学报,2019,35(4):69-76. |
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| 作者姓名： | 拉巴 洛桑曲珍 次珍 平措旺丹 |
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| 作者单位： | 西藏自治区气候中心,西藏拉萨,850001;西藏高原大气环境科学研究所,西藏拉萨,850001;拉萨市气象台,西藏拉萨,850001 |
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| 基金项目： | 国家自然科学基金项目（41465006，41665002）、西藏自治区重点科技计划项目（XZ201703-GA-01）、西藏自治区科技厅自然基金项目（XZ2017ZRG-114）和高原遥感应用技术创新团队项目共同资助。 |
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| 摘 要： | 利用GIS和遥感技术方法分析了2000-2014年那曲地区植被归一化指数（NDVI）的时空分布特征和变化趋势，探讨了NDVI与几种气象因子的关系。结果表明：空间上，研究区植被NDVI在空间上呈自西向东、自南向北逐步增大，高海拔地区小于低海拔地区的分布特点；时间上，近15 a的NDVI总体上呈不显著性下降趋势，NDVI变化可以分为3个阶段，分别为2000-2005年较好，2006-2008年略差，2009-2014年好转。植被面积变化趋势表现为西北部植被处于稳定状态的面积居多，变化较明显的区域集中在中部和东南部地区的人口密集区，改善和退化区域呈现交错出现的特点。那曲地区植被变化的主要影响因素为降水量和热量因素引起的，人类活动在较短时间尺度上对植被也有较大影响。
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| 关 键 词： | NDVI 那曲地区 退化 气象因子 |
| 收稿时间： | 2018-05-07 |
Spatial and temporal variation of NDVI and the reason analysis in Nagqu area |
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| LA Ba,LUO Sang-qu,CI Zhen,PING Cuo-wang.Spatial and temporal variation of NDVI and the reason analysis in Nagqu area[J].Journal of Meteorology and Environment,2019,35(4):69-76. |
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| Authors: | LA Ba LUO Sang-qu CI Zhen PING Cuo-wang |
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| Institution: | 1. Climate Center of Tibet Autonomous Region, Lhasa 850001, China;2. Tibet Institute of Plateau Atmospheric and Environmental Science, Lhasa 850001, China;3. Lhasa Meteorological Observatory, Lhasa 850001, China |
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| Abstract: | The remote sensing and Geographic Information System (GIS) was applied to study the temporal and spatial distribution and change tendency of the Normalized Difference Vegetation Index (NDVI) in Nagqu area from 2000 to 2014.The relationship of meteorological factors with NDVI was also analyzed.The results show that the NDVI in Nagqu area increases gradually from south to north,from west to east,and from high to low altitudes.In recent 15 years,the NDVI,in general,shows no significant decline.Compared with the time from 2006-2008,the values of NDVI in 2000-2005 and 2009-2014 are high.From 2000 to 2014,the vegetation at the most regions in the northwest of Nagqu is in a stable state.The area that vegetation has obvious change concentrates in the central and southeastern regions with a dense population.Degradation and improvement areas show staggering features.The vegetation change is mainly controlled by precipitation and heat climatic conditions.Additionally,human activities play a significant influence on it at a short-term time scale. |
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| Keywords: | NDVI Nagqu area Degeneration Meteorological factor |
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