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1973-2017年贵阳市饮用水源地植被覆盖度的演变特征
赵卫权1,2, 周忠发1,3, 李威2, 杨家芳2, 谢冬冬2
1.贵州师范大学 喀斯特研究院/地理与环境科学学院, 贵州 贵阳 550001;2.贵州省山地资源研究所, 贵州 贵阳 550001;3.国家喀斯特石漠化防治工程技术研究中心, 贵州 贵阳 550001
摘要:
[目的] 探讨贵阳市"两湖一库"(红枫湖、百花湖、阿哈水库)1973-2017年的植被覆盖度变化规律,为定量化探讨城市饮用水源地生态环境演变监测提供科学途径和理论依据。[方法] 采用1973年MSS影像、1993,2001,2008年TM数据和2017年OLI数据5期遥感影像,基于像元二分模型和植被覆盖度动态模型,运用遥感和GIS技术进行分析。[结果] ①研究区域植被覆盖度总体呈现"两头升高,中间降低"的规律,即低覆盖度和高覆盖度面积比例均呈上升趋势,而中低覆盖度、中覆盖度和中高覆盖度均基本呈下降趋势;②2001-2017年期间植被覆盖度年均变化率明显高于前3个时段即1973-1993,1993-2001,2001-2008年3个时段,2017年的中高覆盖度和高覆盖度面积比例之和大于1973年的两者之和,且高植被覆盖度区域的面积比例一直处于稳定上升态势。[结论] 贵阳市"两湖一库"植被中覆盖度部分退化、部分改善,但是整体主要以退化为主,退化原因则是城镇建设用地的扩张;社会经济活动和区域发展政策是地表植被覆盖度演变的主要驱动力,尤其是对低植被覆盖度和中植被覆盖度区域的影响。
关键词:  饮用水源地  植被覆盖度  NDVI  贵阳市
DOI:10.13961/j.cnki.stbctb.2020.01.042
分类号:Q948.12;TP79
基金项目:国家"十三五"重点研发计划课题"喀斯特高原石漠化综合治理与山地旅游产业技术与示范"(2016YFC0502606);贵州省基础研究计划(黔科合基础[2018]1418);贵州省科技计划项目(黔科合平台人才[2017]5726-57);贵州省科技支撑计划(黔科合支撑[2018]2806);贵州省科技计划项目(黔科合平台人才[2016]5674)
Evolution Characteristics of Vegetation Coverage of Main Drinking Water Sources in Guiyang City During 1973-2017
Zhao Weiquan1,2, Zhou Zhongfa1,3, Li Wei2, Yang Jiafang2, Xie Dongdong2
1.Department of Karst Research Institute/Geography and Environmental Sciences, Guizhou Normal University, Guiyang, Guizhou 550001, China;2.Institute of Mountain Resources of Guizhou Province, Guiyang, Guizhou 550001, China;3.State Engineering Technology Institute for Karst Desertification Control, Guiyang, Guizhou 550001, China
Abstract:
[Objective] The changing pattern of vegetation coverage in "two lakes and one reservoir" (Hongfeng lake, Baihua lake, Aha reservoir) from 1973 to 2017 in Guiyang City was discussed in order to provide a scientific approach and theoretical basis for quantitatively exploring the monitoring of the ecological environment evolution of urban drinking water sources.[Methods] Five remote sensing images, including multi-spectral scanner (MSS) image in 1973, thematic mapper (TM) data in 1993, 2001, 2008 and operational land imager (OLI) data in 2017, and GIS technology were used to study the change of surface vegetation coverage, based on a dimidiate model and vegetation coverage dynamic model.[Results] ① The overall vegetation coverage grades of the study area showed a concave type curve, indicating that the proportion of area with low and high coverage increased, while the medium-low coverage, moderate coverage, and medium-high coverage decreased. ② During the period from 2008 to 2017, the annual rate of vegetation coverage change was significantly higher than the previous three periods, namely 1973 to 1993, 1993 to 2001, and 2001 to 2008. The sum of the proportions of medium-high coverage and high coverage areas in 2017 was greater than the sum of the two in 1973. The area proportion of high-vegetation coverage had been steadily rising.[Conclusion] The vegetation coverage in the study area is degraded and improved over time, however the overall coverage is mainly degraded, due to the expansion of urban construction land. Socio-economic activities and regional development policies are the driving forces for the evolution of surface vegetation coverage, especially for areas with low and moderate vegetation coverage.
Key words:  drinking water source  vegetation coverage  normalized difference vegetation index(NDVI)  Guiyang City