陆地碳汇对中国农村人口减少的意想不到的反应
Qing Luo1, Xiaoyong Bai2, Cuiwei Zhao3
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China.
The Science of the total environment
|July 10, 2024
概括
中国的城镇化推动的农村人口减少,出乎意料地增加了陆地碳汇. 人类压力降低促进了植被生长,增强了碳捕获,为生态系统恢复提供了途径.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 遥感 遥感 遥感 遥感
背景情况:
- 中国的快速城市化和农村-城市迁移显著影响陆地碳汇.
- 农村人口减少和相关的城市扩张对碳捕获的确切影响尚不清楚.
研究的目的:
- 调查农村人口减少对中国陆地碳汇能力的影响.
- 确定农村人口变化影响碳捕获的门.
- 分析城市化与碳汇变化之间的关系.
主要方法:
- 利用了2000-2020年间的多源遥感数据.
- 应用了土壤微生物呼吸方程,相对贡献率分析和值分析.
- 农村人口,人类压力,植被恢复,净初级生产率 (NPP) 和净生态系统生产率 (NEP) 的量化变化.
主要成果:
- 农村人口显著减少 (63.91%至36.11%),减少了1.82%的人类压力,并促进了植被恢复 (+8.45%).
- 农村地区的碳吸收能力增加,NPP和NEP的碳吸收能力分别增加了2.95gCm−2 yr−1和2.44gCm−2 yr−1.
- 农村人口急剧减少的地区呈现出1.5倍高的NEP;城市绿地部分抵消了城市扩张的碳汇损失 (增长率为4.96 g C m-2 yr-1).
结论:
- 农村人口减少增加了碳捕获潜力,并促进了中国农村的植被恢复.
- 农村人口密度与NEP之间存在非线性关系,积极影响超过545.686人/平方公里.
- 农村人口减少为自然生态系统恢复和增加碳捕获能力提供了可行的机会.
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