NDVI indicated characteristics of vegetation cover change in China’s metropolises over the last three decades
NDVI indicated characteristics of vegetation cover change in China’s metropolises over the last three decades
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DOI：
10.1007/s10661-010-1715-x
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发表时间：
2011-08
影响因子：
3
通讯作者：
Jinyu Sun;Xuhui Wang;Anping Chen;Yuecun Ma;Mengdi Cui;S. Piao
中科院分区：
文献类型：
--
作者：
Jinyu Sun;Xuhui Wang;Anping Chen;Yuecun Ma;Mengdi Cui;S. Piao
近三十年来中国密集城市化对城市植被的影响是一个令人感兴趣但鲜有研究的问题。本文利用卫星反演的归一化植被指数（NDVI）和社会经济数据，评价了近30年来中国117个城市城市化对植被覆盖的影响。研究结果表明，当前的城市化进程导致了中国大部分城市（尤其是华东地区）城市植被的退化。在全国尺度上，近30 a城市平均NDVI （NDVIu）呈显著下降趋势（P< 0.01），并存在1982—1990年和1990—2006年两个不同的变化趋势期。ndviu在1990年以前无统计学意义，1990年以后显著下降（P< 0.01）。不同地区在ndviu拐点时间上也存在差异。中部地区和东部地区的ndviu分别在1987年和1990年开始显著下降，而西部地区的ndviu在1998年之前保持相对稳定。在中国城市化进程最为迅速的长三角和珠三角地区，ndviu的变化也呈现出不同的特征。20世纪80年代初至90年代中期，珠江三角洲地区ndviu呈快速下降趋势；而长三角地区直到20世纪90年代初才出现明显下降。这种不同的ndviu变化模式与这些地区城市化动态的政策导向差异密切相关，这凸显了实施可持续城市发展政策的重要性。
How urban vegetation was influenced by three decades of intensive urbanization in China is of great interest but rarely studied. In this paper, we used satellite derived Normalized Difference Vegetation Index (NDVI) and socioeconomic data to evaluate effects of urbanization on vegetation cover in China’s 117 metropolises over the last three decades. Our results suggest that current urbanization has caused deterioration of urban vegetation across most cities in China, particularly in East China. At the national scale, average urban area NDVI (NDVIu) significantly decreased during the last three decades (P< 0.01), and two distinct periods with different trends can be identified, 1982–1990 and 1990–2006. NDVIudid not show statistically significant trend before 1990 but decrease remarkably after 1990 (P< 0.01). Different regions also showed difference in the timing of NDVIuturning point. The year when NDVIustarted to decline significantly for Central China and East China was 1987 and 1990, respectively, while NDVIuin West China remained relatively constant until 1998. NDVIuchanges in the Yangtze River Delta and the Pearl River Delta, two regions which has been undergoing the most rapid urbanization in China, also show different characteristics. The Pearl River Delta experienced a rapid decline in NDVIufrom the early 1980s to the mid-1990s; while in the Yangtze River Delta, NDVIudid not decline significantly until the early 1990s. Such different patterns of NDVIuchanges are closely linked with policy-oriented difference in urbanization dynamics of these regions, which highlights the importance of implementing a sustainable urban development policy.