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气候变化增加了绿化,而人类活动加快了中国北部草原的退化

Feifei Cao¹, Leizhen Liu¹, Yuping Rong¹

¹College of Grassland Science and Technology, China Agricultural University, Beijing 100083, China.

The Science of the total environment

|February 9, 2025

概括

中国北方的中国北方.

科学领域:

生态与环境科学生态与环境科学
遥感遥感遥感遥感
植物生长的动力学

背景情况:

中国北部的草原对畜牧,能源和生态系统平衡至关重要,但面临着时间的变化和空间的异质性.
使用单一指数和区域分析的现有研究可能会对草原动态和驱动因素的解释产生偏见.
需要整合多个植被指数的综合方法来理解复杂的草原变化.

研究的目的:

利用多个功能和结构指数,系统地调查中国北部草原的时空趋势.
量化气候变化和人类活动对观测到的植被趋势的相对贡献.
评估不同草原类型的植被结构和功能之间的联系.

主要方法:

综合总初级生产率 (GPP),太阳能诱导的叶绿素光 (SIF),规范差异植被指数 (NDVI) 和叶面积指数 (LAI).
应用部分衍生分析来归因植被变化的驱动因素.
在中国北部的多种草原类型的时空空间趋势分析.

主要成果:

超过70%的草原,特别是温带草原,表现出植被指数的增加;西南阿尔卑斯山草原下降.
气候变化主要推动了绿化 (56.5563.83%),温带降雨和高山草原的温度.
人类活动在某些地区有助于绿化 (36.1743.45%),但在其他地区由于过度放牧和人口增长导致退化 (51.7069.64%).
温带草原表现出强烈的结构功能合 (72.66%),而高山草原表现出增加的GPP与下降的LAI和SIF (57.59%).

结论:

草原对气候和人为驱动因素的反应在空间上是异质的.
多种植被指数对于准确评估草原动态和驱动因素至关重要.
调查结果强调需要基于特定区域条件和驱动因素的有针对性的管理策略.

关键词:

气候变化气候变化气候变化草原的动态草原的动态草地类型草地类型绿化和退化等问题人类活动人类活动部分衍生品分析部分衍生品分析

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