改进水文建模,缩小高碳度与作物反应之间的差距:对水资源的影响
Na Wen1, Yiwen Han1, Junyu Qi2
1College of Land Science and Technology, State Key Laboratory of Efficient Utilization of Agricultural Water Resources, China Agricultural University, Beijing 100193, China.
Water research
|August 23, 2024
概括
大气中二氧化碳 ([CO2]) 的增加增加了玉米的产量,同时减少了水的消耗. 然而,未来的气候变化可能会增加用水量,尽管二氧化碳对作物生长和水文学的益处较高.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 水文学的水文学
背景情况:
- 大气中二氧化碳度 ([CO2]) 的上升影响了作物生理学,影响了口腔电导率 (gs) 和叶面积指数 (LAI).
- 这些变化影响作物用水量和水文循环,需要在高[CO2]下进行量化.
研究的目的:
- 调查高 [CO2] 对谷物玉米水消耗,产量和水/土壤损失在密西西比河上流域 (UMRB) 的影响.
- 开发和应用一个集成非线性gs-CO2和LAI-CO2关系的SWAT-gs-LAI模型.
主要方法:
- 开发了一个SWAT-gs-LAI模型,包含非线性gs-CO2和LAI-CO2关系.
- 在UMRB的历史和未来高[CO2]场景下,对玉米产量,水消耗和水/土壤损失的模拟反应.
主要成果:
- 在历史时期 (1985-2014) 中,高[CO2] (495-825 ppm) 增加了玉米产量和降低了水消耗.
- 升高的[CO2]促进了表面流失,但由于增加LAI和增强的表面覆盖,抑制了沉积物损失.
- 未来的气候变化,而不是仅仅提高[CO2],预计在各种SSP情景下,在UMRB范围内增加玉米的水消耗和产量,增加表面下水和沉积物损失.
结论:
- 基于物理的模型对于准确预测作物生长和在高[CO2]下水文反应至关重要.
- SWAT-gs-LAI模型为评估气候变化对农业和水文系统的影响提供了一个可靠的工具.
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