解析水汽压亏缺对北方陆地植被生产力的影响。
Disentangling the effects of vapor pressure deficit on northern terrestrial vegetation productivity.
机构信息
State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, 100875 Beijing, China.
CSIRO Environment, Private Bag 1, Aspendale, Victoria, Australia.
出版信息
Sci Adv. 2023 Aug 9;9(32):eadf3166. doi: 10.1126/sciadv.adf3166.
The impact of atmospheric vapor pressure deficit (VPD) on plant photosynthesis has long been acknowledged, but large interactions with air temperature (T) and soil moisture (SM) still hinder a complete understanding of the influence of VPD on vegetation production across various climate zones. Here, we found a diverging response of productivity to VPD in the Northern Hemisphere by excluding interactive effects of VPD with T and SM. The interactions between VPD and T/SM not only offset the potential positive impact of warming on vegetation productivity but also amplifies the negative effect of soil drying. Notably, for high-latitude ecosystems, there occurs a pronounced shift in vegetation productivity's response to VPD during the growing season when VPD surpasses a threshold of 3.5 to 4.0 hectopascals. These results yield previously unknown insights into the role of VPD in terrestrial ecosystems and enhance our comprehension of the terrestrial carbon cycle's response to global warming.
大气水汽压亏缺（VPD）对植物光合作用的影响早已得到认可，但 VPD 与空气温度（T）和土壤湿度（SM）之间的大量相互作用仍阻碍了对 VPD 对不同气候带植被生产力影响的全面理解。在这里，我们通过排除 VPD 与 T 和 SM 的相互作用，发现北半球的生产力对 VPD 的反应存在分歧。VPD 与 T/SM 之间的相互作用不仅抵消了变暖对植被生产力的潜在积极影响，而且放大了土壤干燥的负面影响。值得注意的是，对于高纬度生态系统，当 VPD 超过 3.5 至 4.0 百帕斯卡的阈值时，生长季节 VPD 对植被生产力的响应会发生明显变化。这些结果提供了对 VPD 在陆地生态系统中作用的未知见解，并增强了我们对陆地碳循环对全球变暖响应的理解。
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