生态系统用水效率和对黄河流域干旱反应的动态过程,中国
SaiHua Liu1, Lianqing Xue2, Ying Xiao1
1College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.
The Science of the total environment
|May 19, 2024
概括
在黄河流域,生态系统用水效率 (WUE) 正在提高,而毛初级生产率 (GPP) 是一个关键驱动因素. 大多数生态系统表现出对干旱的弹性,尽管累积干旱影响影响了WUE.
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:
- 生态系统用水效率 (WUE) 对于了解气候变化对陆地生态系统的影响至关重要.
- 干旱对WUE的反应机制和驱动因素需要进一步研究,特别是在关键的河流流域.
- 黄河流域 (YRB) 面临着严重的环境压力,使WUE的动态对区域可持续发展至关重要.
研究的目的:
- 分析YRB中的WUE的空间和时间动态.
- 研究WUE对干旱的驱动因素和应对机制.
- 评估干旱对WUE的累积影响,并评估YRB的生态系统弹性.
主要方法:
- 分析使用了总初级生产率 (GPP),蒸发透气 (ET) 和标准降雨蒸发透气指数 (SPEI) 的数据.
- 在YRB中检查了WUE,GPP和ET的空间和时间趋势.
- 评估了GPP,ET,蒸汽压力缺陷 (VPD) 和土壤湿度 (SM) 对WUE和植被生产力的影响.
主要成果:
- 在GPP,ET和WUE中观察到显著的增长趋势,其中63.04%的地区显示了WUE的增强.
- 在大多数地区 (65.36%),GPP是影响WUE的主要因素,特别是在耕地和草原.
- 干旱的累积影响影响了71.00%的WUE,干旱地区经历了更长的持续时间; 74.85%的生态系统表现出抗旱能力.
结论:
- 在YRB中,WUE正在增加,主要由GPP驱动,在土地覆盖类型和气候区之间存在显著差异.
- 干旱对WUE产生重大累积影响,但YRB中的大多数生态系统表现出相当大的弹性,特别是在西部源区.
- 这些发现为了解和预测YRB和类似地区对气候变化的生态系统反应提供了科学基础.
相关概念视频
Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Adaptations that Reduce Water Loss
25.5K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.5K
Xylem and Transpiration-driven Transport of Resources
23.8K
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
23.8K
Responses to Salt Stress
13.1K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.1K
The Water Cycle
24.4K
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
24.4K
What is an Ecosystem?
39.6K
Overview
39.6K


