植被对二氧化碳升的反应对流水变化的关键影响
Cuiyan Liu1, Shuyun Feng2, Qiang Zhang3
1Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China.
The Science of the total environment
|October 12, 2023
概括
升高的二氧化碳通过植被变化影响全球排放. 一个改进的模型显示,植被结构效应显著降低了排水量,而生理效应则增加了排水量,突出了它们在未来预测中的关键作用.
科学领域:
- 水文和气候科学 水文和气候科学
- 地球系统科学 地球系统科学
- 生态系统动力学 生态系统动力学
背景情况:
- 卫星数据显示,全球土地正在变绿,这可能会改变排水模式.
- 关于植被绿化对二氧化碳升高下排放的影响存在差异.
- 了解这些影响对于水资源管理至关重要.
研究的目的:
- 为了评估由于二氧化碳引起的植被变化增加而导致的排水变化.
- 提出一个改进的布迪科框架,将植被结构和生理影响纳入其中.
- 量化植被对流水结构和生理影响的不同贡献.
主要方法:
- 开发一个改进的布迪科框架,考虑植被结构 (STR) 和生理 (PHY) 影响.
- 在大气二氧化碳度 (eCO2) 升高的情况下,模拟流水变化 (ΔR).
- 归因分析以确定PHY和STR效应对ΔR的贡献.
主要成果:
- 改进的Budyko框架在模拟流量变化方面表现出很高的表现 (NSE = 0.82).
- 仅考虑PHY或STR效应导致分别显著高估 (188%) 或低估 (165%) 的ΔR.
- PHY 和 STR 影响对 ΔR 的贡献分别为 12.8% 和 -62%,其中 STR 影响占主导地位.
结论:
- 植物结构和生理效应对于准确的流水预测是不可或缺的.
- 结构效应显著降低了排水量,超过了在二氧化碳升高的情况下生理效应的贡献.
- 植被对二氧化碳升高的反应极大地影响了未来的排放预测,需要综合建模方法.
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