引用本文:王 维,王文杰,李俊生,吴 昊,许 超,刘孝富,刘 锬,等.基于归一化差值植被指数的极端干旱气象对西南地区生态系统影响遥感分析[J].环境科学研究,2010,23(12):1447-1455.
WANG Wei,WANG Wen-jie,LI Jun-sheng,WU Hao,XU Chao,LIU Xiao-fu,LIU Tan,et al.[J].Reserrch of Environmental Science,2010,23(12):1447-1455.]
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基于归一化差值植被指数的极端干旱气象对西南地区生态系统影响遥感分析
王 维1,2, 王文杰2, 李俊生3, 吴 昊4, 许 超5, 刘孝富6, 刘 锬7
1.北京师范大学,地表过程与资源生态国家重点实验室,北京 100875;2.中国环境科学研究院,北京 100012;3.中国环境科学研究院,北京 100013;4.中国环境科学研究院,北京 100014;5.中国环境科学研究院,北京 100015;6.中国环境科学研究院,北京 100016;7.中国环境科学研究院,北京 100017
摘要:
以年际同期归一化差值植被指数(Normalized Difference Vegetation Index,NDVI)作为评价指标,分析极端干旱气象对西南地区生态系统影响的时空分布特征,提出旱灾可能造成的生态影响及应采取的管理和科研措施. 结果表明:2009年8月—2010年3月,西南地区的生态系统受极端干旱天气影响显著,威胁程度呈上升趋势;贵州、广西和云南三省(自治区)受干旱影响的生态系统面积先后超过各省份生态系统总面积的80%,生态系统强度变差区集中在云南的中东部、贵州西南部和广西西北部等地区;农田生态系统受损严重,农作物大面积枯死或绝收;大量水库、池塘干涸,河流水位明显下降,部分河流断流,危及水生生物生存;自然植被影响明显,植被生长明显受到抑制,干热河谷地带和岩溶地形区域植被大面积退化,威胁当地生物多样性.
关键词:  中等分辨率成像分光辐射计(MODIS)  NDVI  极端干旱气象  西南地区  生态系统影响
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基金项目:国家“十一五”科技支撑计划项目(2008BAC34B00);国家环保公益性行业科研专项(200909113)
WANG Wei1,2, WANG Wen-jie2, LI Jun-sheng3, WU Hao4, XU Chao5, LIU Xiao-fu6, LIU Tan7
1.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China;3.Chinese Research Academy of Environmental Sciences, Beijing 100013, China;4.Chinese Research Academy of Environmental Sciences, Beijing 100014, China;5.Chinese Research Academy of Environmental Sciences, Beijing 100015, China;6.Chinese Research Academy of Environmental Sciences, Beijing 100016, China;7.Chinese Research Academy of Environmental Sciences, Beijing 100017, China
Abstract:
Interannually contemporaneous Normalized Difference Vegetation Index (NDVI) was used as an evaluation indicator to analyze the spatial and temporal distribution characteristics for impacts of extreme drought weather on ecosystems in the Southwest Region of China. The possible consequences to the ecosystems caused by drought, and the measures of management and scientific research which should be adopted were put forward. The results indicate that from August 2009 to March 2010: Ecosystems in the Southwest Region were remarkably impacted by extreme drought weather, assuming an ascending trend of threatening degree; The area of ecosystems that suffered from this disaster in Yunnan, Guangxi and Guizhou accounted for more than 80% of the total ecosystem area in these three administrative regions; ecosystem intensity degraded area was concentrated in the eastern region of Yunnan, southwest region of Guizhou and northwest region of Guangxi; The farmland ecosystem was seriously damaged, resulting in large areas of crops dying off or failing; A number of reservoirs and ponds dried up; water levels of rivers declined apparently and parts of the rivers suffered from zero flow, threatening the survival of aquatic organisms; The effect on natural vegetation was obvious, and the vegetation growth was apparently suppressed. Large areas of vegetation in the dry-hot valley and the Karst area degenerated, threatening the local biodiversity.
Key words:  MODIS  NDVI  extreme drought weather  Southwest Region  impact on ecosystem