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Empirical Evidence for Impacts of Internal Migration on Vegetation Dynamics in China from 1982 to 2000

机译:1982年至2000年中国内部迁移对植被动态影响的经验证据

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摘要

Migration is one of the major socio-economic characteristics of China since the country adopted the policy of economic reform in late 1970s. Many studies have been dedicated to understand why and how people move, and the consequences of their welfare. The purpose of this study is to investigate the environmental impacts of the large scale movement of population in China. We analyzed the trend in the Normalized Difference Vegetation Index (NDVI) from the Advanced Very High Resolution Radiometer (AVHRR) along with China migration data from the 1 percent national survey during 1982-1987, the 4th national census during 1985-1990 and the 5th national census during1995∼2000. We found that the internal migration in China has a statistically significant negative impact on vegetation growth at the provincial scale from 1982 to 2000 even though the overall vegetation abundance increased in China. The impact from migration (R2=0.47, P=0.0001) on vegetation dynamics is the second strongest as among the factors considered, including changes in annual mean air temperature (R2=0.50, P=0.0001) and annual total precipitation (R2=0.30, P=0.0049) and gross domestic production (R2= 0.25, P=0.0102). The negative statistical relationship between the rate of increase in total migration and the change in vegetation abundance is stronger (R2=0.56, P=0.0000) after controlling for the effects of changes in temperature and precipitation. In-migration dominates the impacts of migration on vegetation dynamics. Therefore, it is important for policy makers in China to take the impacts of migration on vegetation growth into account while making policies aiming at sustainable human-environment relations.
机译:自从中国在1970年代末采取经济改革政策以来,移民是中国的主要社会经济特征之一。许多研究致力于了解人们为什么以及如何移动以及他们的福利后果。这项研究的目的是调查中国人口大规模流动的环境影响。我们分析了超高分辨率高分辨率辐射计(AVHRR)的归一化植被指数(NDVI)的趋势,以及1982年至1987年(全国第4位)全国1%人口普查的中国迁徙数据。进行了1985-1990年的人口普查,以及1995-2000年的第5次全国人口普查。我们发现,从1982年到2000年,中国的内部迁移对省级植被的生长具有统计学上的显着负面影响,尽管中国的总体植被丰度有所增加。在考虑的因素中,迁移(R 2 = 0.47,P = 0.0001)对植被动力学的影响第二强,包括年平均气温的变化(R 2 = 0.50,P = 0.0001)和年总降水量(R 2 = 0.30,P = 0.0049)和国内生产总值(R 2 = 0.25,P = 0.0102) 。在控制温度和降水变化的影响后,总迁移率的增加与植被丰度变化之间的负统计关系更强(R 2 = 0.56,P = 0.0000)。迁徙占主导地位的是迁徙对植被动态的影响。因此,对于中国的决策者来说,在制定旨在可持续的人与环境关系的政策时,必须考虑到移民对植被生长的影响。

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