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技术塔里木河流域植被覆盖变化的遥感监测
管文轲1, 韦红2,3, 钟家骅2,3, 霍艾迪2,3, 杜伟宏2,3, 郑小路2,3
1.新疆林业科学院, 新疆 乌鲁木齐 830002;2.长安大学 旱区地下水与生态效应教育部重点实验室, 陕西 西安 710054;3.长安大学 环境科学与工程学院, 陕西 西安 710054
摘要:
[目的]对塔里木河流域植被恢复成效及发展趋势进行定量分析,为流域生态治理提供基础研究依据。[方法]基于2007—2017年MODIS-MOD13 Q1多光谱遥感资料,以EVI (enhanced vegetation index)植被指数为切入点,综合运用ArcGIS等软件平台,沿塔里木河两岸设立监测区域并构建植被覆盖度时间序列模型,对塔里木河流域植被的变化规律进行动态监测及趋势分析。[结果]①塔里木河流域植被覆盖基数低,且不同河段植被状况差异大,2017年干流植被覆盖度最高仅为23.56%,上游段植被覆盖最高可达下游段的3.36倍,上游植被覆盖度年内极值比达4.28; ②2017年塔里木河流域全年植被覆盖水平相比2007年无显著差异,其未来的生态环境演变时间序列模型呈现出良性趋势; ③NDVI指数与EVI指数的监测结果无显著差异,但NDVI在高植被区易出现饱和现象,在低植被区容易偏低估计。[结论]塔里木河流域当前植被覆盖保持稳定,未来生态环境有好转趋势,基于EVI指数对植被恢复成效的动态监测与定量分析是可行的。
关键词:  塔里木河  植被指数  时间序列  动态监测
DOI:10.13961/j.cnki.stbctb.2018.05.039
分类号:X821
基金项目:新疆林业厅科技支撑专项“塔里木河胡杨林恢复研究与示范”(2017-HY)
Remote Sensing Monitoring of Vegetation Cover Change in Tarim River Basin
GUAN Wenke1, WEI Hong2,3, ZHONG Jiahua2,3, HUO Aidi2,3, DU Weihong2,3, ZHENG Xiaolu2,3
1.Xinjiang Academy of Forestry, Urumqi, Xinjiang 830002, China;2.Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an, Shaanxi 710054, China;3.School of Environmental Science & Engineering, Chang'an University, Xi'an, Shaanxi 710054, China
Abstract:
[Objective] To analyze the vegetation restoration effectiveness and development trends in the Tarim River basin in order to provide research basis for the ecological management of the basin.[Methods] Based on MODIS-MOD13 Q1 multi-spectral remote sensing data from 2007 to 2017, EVI (enhanced vegetation index) was used as a breakthrough point. ArcGIS software was used and time series models of vegetation cover were constructed to dynamically monitor the vegetation changes in the Tarim River basin.[Results] ①The vegetation coverage of Tarim River basin was low, and the spatial-temporal heterogeneity of vegetation index was large. The highest vegetation cover in the main steam was only 23.56% in July, 2017, while the highest vegetation coverage in the upstream was 3.36 times of that of the downstream section, and the annual maximum ratio of the vegetation coverage in the upper reaches was 4.28. ②There was no significant difference in vegetation coverage between 2017 and 2007 in the whole basin. Time series model showed a positive trend for the future vegetation restoration of the Tarim River. ③There was no significant difference between NDVI and EVI, but NDVI tended to be low in areas with low vegetation coverage, while it tended to be high in areas with high vegetation coverage.[Conclusion] The vegetation coverage of the Tarim River basin remains stable currently. Moreover, the ecological environment will be improved in the future. Dynamic monitoring and quantitative analysis of vegetation restoration effectiveness based on EVI index is feasible.
Key words:  Tarim River  vegetation index  time series model  dynamic monitoring