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Environmental impact assessment of ecological migration in China: a survey of immigrant resettlement regions

生态移民的环境影响研究——以广西移民迁入区 为例

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Abstract

Implementation of ecological migration (eco-migration) policies may improve the fragile ecological environment of emigration areas; however, it also places enormous pressure on the human-environment systems in immigrant resettlement regions. Via the application of participatory rural appraisal (PRA) methods, ecological footprint (EF), and stochastic impacts by regression on population, affluence, and technology (STIRPAT) models, 21 villages of Huanjiang County in Guangxi Zhuang Autonomous Region, China were used in this research as a case study area for the environmental appraisal of eco-migration policies in immigrant resettlement regions. Results show: (1) In the past 20 years of implementing eco-migration policies, the EF per capita constantly increased, the biocapacity (BC) per capita constantly decreased, and the ecological deficit gradually increased, indicating an extremely negative impact of eco-migration projects on the ecological environment in the immigration areas. (2) Cropland and forest land are the most important components of the per-capita EF. The per-capita EF of cropland experienced overall a first increasing and then decreasing trend, and the per-capita EF of forest land constantly increased and showed the most rapid increase among all types of EF in the last two decades. (3) The proportion of per-capita EF of different types of productive land is in the order of forest land > cropland > carbon uptake land > built-up land > grazing land from high to low, and this is a significant change from the original order of cropland > forest land > carbon uptake land > grazing land > built-up land. (4) Because of unequal possession of ecologically productive resources, the overall per-capita EF, overall per-capita BC, overall per-capita ecological deficit of productive land use by migrants, and their component values of different types of productive land use are all lower than the corresponding values of the natives. The ecological deficit of natives is more severe than that of migrants. (5) Whereas population growth and overexploitation of resources lead directly to the increased pressure on the ecological environment in the immigration areas, increasing nonagricultural income and improving the consumption structure can reduce the dependence of farmers on the land, thus inhibiting the increase of EF.

中文概要

目的

生态移民在改善迁出区生态环境的同时,也改变 了迁入区资源环境配置格局。客观评价大量生态 移民涌入给迁入区造成的生态系统压力,对生态 移民政策的可持续推进及新形式下解决脱贫和 生态环境保护问题有重要意义。

创新点

从微观农户尺度,采用生产性生态足迹评价移民 迁入区生态移民工程的生态环境影响。

方法

1. 基于参与式农户调查方法,获取移民迁入区移 民和当地驻民的生态足迹账户、土地利用及农户 家庭等基本信息;2. 采用生产性生态足迹评价移 民迁入区生态移民工程的生态环境影响;3. 构建 “STIRPAT”模型,分析移民迁入区生态环境变 化的影响因素。

结论

1. 大规模移民的迁入对移民安置区的生态环境造 成持续压力;2. 人口规模扩大、荒草地开垦以及 消费需求增长是造成移民迁入区生态环境压力 的主要原因;3. 合理测算移民迁入区人口承载 力、促进农户生计转型和增加农户生计多样化可 以有效缓解生态移民对生态环境的巨大压力。

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Correspondence to Ye-cui Hu.

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Project supported by the National Natural Science Foundation of China (Nos. 70903061 and 41171440) and the Fundamental Research Funds for the Central Universities (No. 2652015175), China

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Hu, Yc., Zhou, W. & Yuan, T. Environmental impact assessment of ecological migration in China: a survey of immigrant resettlement regions. J. Zhejiang Univ. Sci. A 19, 240–254 (2018). https://doi.org/10.1631/jzus.A1600669

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