筑坝拦截对梯级水库植被覆盖时空变化的影响研究——以乌江、赤水河流域为例  

Study on the impact of dam construction and interception on spatiotemporal changes in vegetation coverage in cascade reservoirs:Wujiang and Chishuihe catchments

作　　者：符俊杰 孙君瑶 王伟[3] 刘帆[3] Samuel Wamburu Muthui 李伟[3] Fu Jun-Jie;Sun Jun-Yao;Wang Wei;Liu Fan;Samuel Wamburu Muthui;Li Wei(College of Science,Tibet University,Lhasa 850000,China;Research Center for Ecology and Environment of Qinghai-Tibetan Plateau,Tibet University,Lhasa 850000,China;CAS Key Laboratory of Aquatic Botany and Watershed Ecology,Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China)

机构地区：[1]西藏大学理学院,拉萨850000 [2]西藏大学青藏高原生态与环境研究中心,拉萨850000 [3]中国科学院武汉植物园,中国科学院水生植物与流域生态重点实验室,武汉430074

出　　处：《植物科学学报》2021年第6期592-599,共8页Plant Science Journal

基　　金：国家重点研发计划(2016YFA0601001);国家自然科学基金(31800396)。

摘　　要：乌江流域近年来建成一系列梯级水电站,本文以乌江(有坝)、赤水河(无坝)为例,基于Modis-NDVI时间序列数据,采用Sen趋势分析、Hurst指数等方法,研究筑坝对植被覆盖过去变化趋势以及未来变化的可持续性影响,及其影响的尺度范围。结果显示:乌江、赤水河流域NDVI均呈波动上升趋势,主要变化类型均为显著增加;在空间尺度上,乌江流域梯级水库密集建设的中下游地区植被覆盖当前变化为减少趋势。乌江流域与赤水河流域植被覆盖未来变化趋势存在差异,乌江流域平均Hurst指数<0.5,植被覆盖变化反向持续性较强,反持续类型区域主要分布于流域中下游;赤水河流域Hurst指数>0.5,植被覆盖变化正向持续性较强。筑坝活动对河流周边过去的植被覆盖造成了影响,且对未来植被覆盖变化的影响具有持续性。A series of cascade hydropower stations have been built in the Wujiang catchment in recent years.Here,we studied the sustainability of past and future changes in vegetation coverage and the scale of dam construction impact using MODIS normalized difference vegetation index(NDVI)time series data,Sen trend analysis,and Hurst index taking Wujiang(dam constructed)and Chishuihe(no dam construction)as examples.Results indicated that:(1)the NDVI in the Wujiang and Chishuihe catchments showed a fluctuating upward trend,and the main variation type increased significantly.(2)On the spatial scale,vegetation coverage in the middle and lower reaches of the Wujiang catchment decreased.(3)Future trends in vegetation coverage differed for the Wujiang and Chishuihe catchments.Average Hurst index of the Wujiang catchment was less than 0.5,indicating relatively strong anti-sustainability of vegetation coverage change,especially in the middle and lower reaches of the catchment.Average Hurst index of the Chishuihe catchment was greater than 0.5,indicating strong sustainability of vegetation coverage change.Thus,dam construction has influenced vegetation coverage around the river in the past and will sustainably influence future vegetation coverage variation.

关 键 词：植被覆盖 时空变化 乌江流域 赤水河流域 筑坝 HURST指数 

分 类 号：Q948[生物学—植物学]