Temperature effects on the global patterns of photosynthetic quantum efficiency

Author:

Sandoval DavidORCID,Flo VictorORCID,Morfopoulos CatherineORCID,Prentice Iain ColinORCID

Abstract

AbstractThe photosynthetic quantum efficiency (φ0) is a key input parameter for modelling gross primary productivity in terrestrial biosphere models. Historically, these models assumedφ0to be constant, based on leaf measurements under unstressed conditions and within a narrow temperature range. However, increasing evidence suggests a temperature-dependentφ0on temperature, though it remains unclear whether this response is generalized or if it propagates to the ecosystem. Here, we derivedφ0(T) at the ecosystem level for sites distributed globally, using sub-daily eddy covariance measurements of CO2exchange and above/below-canopy measurements of photosynthetic flux density to derive the fraction of absorbed photosynthetically active radiation (fAPAR). We found thatφ0(T) shows a consistent bell-shaped response curve with temperature in all the sites we analysed. These patterns held when analysed with a larger global dataset using remotely sensed fAPAR. Furthermore, we observed that the values ofφ0(T) are not markedly different among biomes, instead, there is a gradual transition of the peakφ0(T) which decreases following an aridity gradient. Additionally, we noted varying sensitivity to temperature among the different sites, with sensitivity increasing as growth temperature decreases.

Publisher

Cold Spring Harbor Laboratory

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3