生态系统的水利用效率和碳利用效率对中国洛斯高原的植被绿化有相反的反应
Yue Wang1, Guangyao Gao2, Yanzhang Huang1
1State Key Laboratory for Ecological Security of Regions and Cities, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|January 23, 2025
概括
中国洛斯高原的植被绿化提高了用水效率 (WUE),但对碳利用效率 (CUE) 有不同的影响. 尽管WUE增加了,但增强的植被覆盖面并不能保证该干旱地区的碳捕获潜力更大.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 生态系统的水利用效率 (WUE) 和碳利用效率 (CUE) 对于了解干旱地区的水消耗和碳捕获权衡至关重要.
- 植被覆盖,气候和土壤水分之间影响WUE和CUE合的相互作用仍然不太清楚,特别是在经历重大植被变化的地区.
研究的目的:
- 调查中国洛斯高原的WUE和CUE变异的驱动因素,这是一个典型的水有限地区.
- 分析植被绿化趋势对WUE和CUE的影响,考虑植被密度,气候变量和土壤水分等因素.
主要方法:
- 利用空间随机森林和结构方程模型来分析2001-2020年的数据.
- 评估了植被绿化,植被覆盖密度 (NDVI),蒸汽压力缺陷 (VPD),降水和温度对WUE和CUE的影响.
主要成果:
- 在大部分绿化区域,WUE显著增加,而CUE显示出不同的反应 (略有下降或增加).
- 植被绿化对WUE产生了积极的影响 (42.0%解释),但对CUE产生了负面影响 (25.0%解释).
- 密集的植被覆盖 (NDVI>0.5) 对WUE增加不利,但对CUE增加有利. 确定了最佳降水 (400-600毫米) 和温度 (~10°C) 范围,分别用于WUE和CUE增强.
结论:
- 虽然植被绿化在干旱地区增加了WUE,但并不一定会转化为更好的碳捕获潜力.
- 了解植被动态和水-碳合之间的复杂相互作用对于干旱环境中有效的生态恢复和可持续的生态系统管理至关重要.
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