摘要
利用中分辨率成像光谱仪(MODIS)所合成的MOD13Q1数据,从时间变化、空间分异、重心迁移和地形因子4个方面分析了西双版纳生态工程实施前(2004~2010年)和实施后(2011~2017年)NDVI(植被归一化指数)值的变化特征,并探讨夏季NDVI值和气象因子的关系。结果表明:①2004~2010年西双版纳NDVI以-0.176%/a的速率下降,而2011~2017年NDVI以0.221%/a的速率上升。②西双版纳NDVI频度呈"单峰"结构,生态工程实施后NDVI阈值>0.9所占面积比例增加最为显著(增加了17.2%),NDVI重心由西南方向(迁移距离7.58 km)转向东南方向(迁移距离4.75 km)。③与2004~2010年相比,2011~2017年NDVI在海拔720~870 m、坡度13°~16°以及东北方向上恢复成效最为显著,增长率分别为2.7%,1.4%和1.2%。④夏季气温过高、降水过多以及日照时数少是导致夏季NDVI值最低的主要因素之一。⑤生态工程的实施对2011~2017年西双版纳NDVI的上升具有重要影响,但西双版纳NDVI下降区域的面积比重仍然较大,部分地区的生态环境建设需要继续加强。
Based on the MOD13 Q1 data synthesized by Moderate Resolution Imaging Spectroradiometer(MODIS), the variation characteristics of Normalized Difference Vegetation Index(NDVI) in Xishuangbanna, Yunan Province before(2004~2010) and after(2011~2017) the implementation of ecological project were analyzed from four aspects of time variation, spatial variation, spatial migration of centroid and terrain factor, and the relationship between NDVI and meteorological factors in summer was discussed. The results showed that(1) NDVI decreased at the rate of-0.176% per year during 2004~2010, while NDVI increased at the rate of 0.221% per year during 2011~2017.(2) The NDVI frequency was featured by a unimodal structure. After the implementation of ecological project, the area of NDVI that is in range of 0.9 to maximum significantly increased by 17.2%, and the centroid of NDVI shifted from the southwest(7.58 km migration distance) to the southeast(4.75 km migration distance).(3) Compared with NDVI in the years of 2004-2010, NDVI in the years of 2011~2017 increased significantly at an altitude of 720-870 m, slopes of 13°-16° and the northeast direction, with the growth rate of 2.7%, 1.4% and 1.2%, respectively.(4) The main factors leading to the lowest NDVI value in summer included high temperature, excessive precipitation and less sunshine duration.(5) The implementation of ecological project had an important impact on the increase of NDVI during 2011~2017, but there was a large proportion of areas showing a NDVI decline, and the ecological environment construction in some areas need to be strengthened.
作者
赵桔超
杨昆
朱彦辉
ZHAO Juchao;YANG Kun;ZHU Yanhui(School of Tourism and Geographical Science, Yunnan Normal University, Kunming 650500, China;The Engineering Research Center of GIS Technology in Western China of Ministry of Education of China, Kunming 650500, China;School of Information, Yunnan Normal University, Kunming 650500, China)
出处
《人民长江》
北大核心
2019年第8期56-62,80,共8页
Yangtze River
基金
国家高技术研究发展计划项目(2012AA121402)
国家自然科学基金青年科学基金项目(41501436)
关键词
NDVI
重心迁移
时空变化
地形因子
气象因子
生态工程
西双版纳
NDVI
spatial migration of centroid
temporal and spatial variations
terrain factors
meteorological factors
ecological project
Xishuangbanna district
