自然资源遥感2017，Vol.29Issue(3)：128-136,9.DOI:10.6046/gtzyyg.2017.03.19
近15年中国西南地区植被覆盖度动态变化
Monitoring and dynamic analysis of fractional vegetation cover in southwestern China over the past 15 years based on MODIS data
摘要
Abstract
Fractional vegetation cover (FVC) is a critical indicator for vegetation and eco-environment.It is frequently used as a basic input for hydrology, meteorology and water-soil protection studies at regional or global scales.Southwestern China is an important ecological barrier and the major water supplying area in China.It is important to carry out the study of changes of regional fractional vegetation cover for the protection of eco-environment.In this paper, based on the MODIS-NDVI data obtained from 2000 to 2014, the authors estimated fractional vegetation cover of southwestern China by using the method of dimidiate pixel model, and analyzed the spatial-temporal variation characteristics of the FVC.The results show that, in the past 15 years, the FVC of southwestern China has shown an increasing trend in general but decreased in some meadow areas over the northwest of the study area and the urban expanded areas.In different kinds of ecosystem types, the forest shows the largest average increase of the annual maximum FVC (0.096 2 a-1, p<0.05), while the grassland shows the smallest increase (0.031 1 a-1, p=0.582).Fractional vegetation cover has increased in different degrees in most seasons in the past 15 years in southwestern China, with the increase in autumn being most rapid (0.229 8 a-1) and has most significant trend (p<0.01), followed by spring.For better understanding the effects of climate change on FVC, the correlation coefficients of climatic factors and the annual maximum FVC in different temporal durations were calculated.The results suggest that the annual maximum FVC is significantly related to accumulated precipitation of autumn and mean temperature in summer, showing correlation coefficients of 0.320 and 0.281.In addition, human activities are also important causes resulting in FVC change and the effect has increased in both positive and negative aspects.关键词
植被覆盖度/像元二分模型/西南地区/气候变化/人类活动Key words
fractional vegetation cover/dimidiate pixel method/southwestern China/climatic factor/human activities分类
信息技术与安全科学引用本文复制引用
郑朝菊,曾源,赵玉金,赵旦,吴炳方..近15年中国西南地区植被覆盖度动态变化[J].自然资源遥感,2017,29(3):128-136,9.基金项目
国家重点研发计划项目"区域生态系统服务与生态安全格局演变"(编号: 2016YFC0502102)、"基于多源遥感的生态参数标准化数据集构建"(编号: 2016YFC0500201)和国家科技支撑计划项目"西南生态安全屏障决策支撑技术体系"(编号: 2011BAC09B08)共同资助. （编号: 2016YFC0502102）
