Satellite-based Studies on Large-Scale Vegetation Changes in China

被引:55
作者
Zhao, Xia [1 ]
Zhou, Daojing [2 ,3 ]
Fang, Jingyun [1 ,2 ,3 ]
机构
[1] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
[2] Peking Univ, Coll Environm Sci, Dept Ecol, Beijing 100871, Peoples R China
[3] Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
Normalized Difference Vegetation Index (NDVI); phenology; remote sensing; vegetation coverage; vegetation degradation; vegetation productivity; NET PRIMARY PRODUCTION; BIOMASS CARBON STOCKS; LAND-COVER CHANGES; NORTHEAST CHINA; SPRING PHENOLOGY; YIELD ESTIMATION; INTERANNUAL VARIABILITY; CLIMATIC VARIATIONS; LAKE RESTORATION; TIBETAN PLATEAU;
D O I
10.1111/j.1744-7909.2012.01167.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Remotely-sensed vegetation indices, which indicate the density and photosynthetic capacity of vegetation, have been widely used to monitor vegetation dynamics over broad areas. In this paper, we reviewed satellite-based studies on vegetation cover changes, biomass and productivity variations, phenological dynamics, desertification, and grassland degradation in China that occurred over the past 23 decades. Our review shows that the satellite-derived index (Normalized Difference Vegetation Index, NDVI) during growing season and the vegetation net primary productivity in major terrestrial ecosystems (for example forests, grasslands, shrubs, and croplands) have significantly increased, while the number of fresh lakes and vegetation coverage in urban regions have experienced a substantial decline. The start of the growing season continually advanced in China's temperate regions until the 1990s, with a large spatial heterogeneity. We also found that the coverage of sparsely-vegetated areas declined, and the NDVI per unit in vegetated areas increased in arid and semi-arid regions because of increased vegetation activity in grassland and oasis areas. However, these results depend strongly not only on the periods chosen for investigation, but also on factors such as data sources, changes in detection methods, and geospatial heterogeneity. Therefore, we should be cautious when applying remote sensing techniques to monitor vegetation structures, functions, and changes. [ Jingyun Fang (Corresponding author)]
引用
收藏
页码:713 / 728
页数:16
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