期刊
ECOLOGICAL INDICATORS
卷 144, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ecolind.2022.109475
关键词
Photosynthetic capacity; Vcmax; Leaf nitrogen; Drought; Leaf ontogeny; Interannual variation
资金
- Fundamental Research Funds for the National Natural Science Foundation of China (NSFC) [32101588, 32071842, 31901366, 32071843]
- U.S.-China Carbon Consortium (USCCC)
This study continuously monitored the photosynthetic capacity of a desert shrub species and found significant interannual and seasonal variations in its maximum carboxylation rate (Vcmax). The Vcmax was primarily regulated by leaf nitrogen content and soil water content, with a greater impact during the leaf-expanding stage of the shrub.
A plant's photosynthetic capacity is typically reflected by its maximum carboxylation rate (Vcmax), which varies with time and plant functional type. In what way Vcmax in a xerophytic-shrub species changes in response to variation in its desert habitat remains poorly understood. In this study, Vcmax was continuously monitored in a common desert-shrub species, Artemisia ordosica, with a portable photosynthetic system over seven growing seasons from 2013 to 2019. Vcmax's annual and interannual variations were subsequently assessed in conjunction with a meta-analysis carried out as a separate study. Vcmax in the species did not show a distinct seasonal pattern over the seven growing seasons. It rather displayed extensive year-to-year variations in the seasonal peak and its associated timing, exhibiting greater plasticity as compared with other plant functional types. Seasonal variation in Vcmax was primarily controlled by leaf nitrogen content per area (Narea) in a positive, linear manner, with the relationship's sensitivity varying as a function of soil volumetric water content (VWC). Interannual variation in Vcmax was regulated by annual mean VWC, also in a positive, linear manner. The effect of Narea on Vcmax was amplified during the leaf-expanding stage of the shrub. Given severe drought anticipated under continued climate change, xerophytic shrubs are believed sufficiently malleable to acclimatize to ongoing environmental change in deserts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据