基于MODIS NDVI的广西西南典型生态区植被变化对比监测  

Vegetation variation in typical ecological sections of Southwest Guangxi based on MODIS NDVI data

作　　者：陈燕丽[1,2] 黄敏堂 莫伟华[1,2] 陆虹 王君华[1,2] 

机构地区：[1]广西气象减灾研究所国家卫星气象中心遥感应用试验基地,南宁530022 [2]广西气象减灾研究所气象GIS应用联合实验室,南宁530022 [3]上思县气象局,广西上思535500 [4]广西区气候中心,南宁530022

出　　处：《气象科学》2015年第1期93-99,共7页Journal of the Meteorological Sciences

基　　金：中国气象局气候变化专项(CCSF201308);广西自然科学基金(2013GXNSFAA019283);广西自然科学基金项目(桂科自0991207);广西气象局重点气象科研与业务攻关项目(QK200602)

摘　　要：利用2001—2010年MODIS NDVI逐16 d合成数据对广西十万大山和桂西岩溶山地两个典型生态区植被进行对比监测,分析植被年内变化特征及年际变化趋势。利用同时期的气温和降水量数据,分析两个典型生态区植被NDVI对气温和降水量的响应差异。结果表明:十万大山和桂西岩溶山地生态区年内MODIS NDVI变化特征相似,均表现出"夏秋高,冬春低"的趋势,其中十万大山生态区植被覆盖相对稳定,季节变化较小。近10 a来两个生态区植被均以改善为主,植被改善面积与退化面积比例均约为3∶2。植被年际变化幅度较小,长势较稳定。降水量、平均气温与十万大山生态区植被NDVI的相关性总体上好于桂西岩溶山地生态区,两个生态区植被与降水的相关性较一致。在夏季多表现为负相关,春、秋、冬3季多表现为正相关,这与广西降水时段集中且强度较大的特点有关。由于植被类型的显著差异,两个生态区与气温的相关性具有显著差异。By using the 16 d MODIS NDVI series data during 2001 to 2010, the annual variation characteristics and interannual variation trends of vegetation in two typical ecological sections of Guangxi, Shiwandashan and Guixiyanrong, are analyzed. The mean data of precipitation and temperature are taken as climatic variables to compare the relationship between NDVI series and climatic factors over different types of ecological sections, which aims to explore the responses of climatic-driven factors to vegetation change for different ecological sections. Results show that the annual variation characteristics of Shiwan-dashan and Guixiyanrong ecological sections are similar, both of which exhibit higher values in summer and autumn and lower ones in winter and spring. The NDVI series of Shiwandashan ecological section change more stably with the smaller seasonal variation. The area of vegetation has been increasing in both two ecological sections in recent 10 years, and the ratio between areas of vegetation increasing and de- creasing is about 3：2. Vegetation vigor is stable and its interannual variability is smooth in these two eco- logical sections. The correlation of precipitation and temperature with vegetation NDVI in Shiwandashan ecological section is better than that in Guixiyanrong ecological section. The correlations of precipitation with the vegetacion in both two ecological sections are basically consistent, which shows negative in sum- mer but positive in other three seasons on the whole. It is closely related to the precipitation characteris- tics of Guangxi. Due to the significant differences of the types of vegetation, the correlation of temperature with vegetation varies in the two ecological sections.

关 键 词：NDVI 植被变化 生态区 气候因子 

分 类 号：P407.8[天文地球—大气科学及气象学]