Global response patterns of plant photosynthesis to nitrogen addition: A meta-analysis

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Xingyun Liang, Tong Zhang, Xiankai Lu, David S. Ellsworth, Hormoz BassiriRad, Chengming You, Dong Wang, Pengcheng He, Qi Deng, Hui Liu, Jiangming Mo, Qing Ye
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引用次数: 116

Abstract

A mechanistic understanding of plant photosynthetic response is needed to reliably predict changes in terrestrial carbon (C) gain under conditions of chronically elevated atmospheric nitrogen (N) deposition. Here, using 2,683 observations from 240 journal articles, we conducted a global meta-analysis to reveal effects of N addition on 14 photosynthesis-related traits and affecting moderators. We found that across 320 terrestrial plant species, leaf N was enhanced comparably on mass basis (Nmass, +18.4%) and area basis (Narea, +14.3%), with no changes in specific leaf area or leaf mass per area. Total leaf area (TLA) was increased significantly, as indicated by the increases in total leaf biomass (+46.5%), leaf area per plant (+29.7%), and leaf area index (LAI, +24.4%). To a lesser extent than for TLA, N addition significantly enhanced leaf photosynthetic rate per area (Aarea, +12.6%), stomatal conductance (gs, +7.5%), and transpiration rate (E, +10.5%). The responses of Aarea were positively related with that of gs, with no changes in instantaneous water-use efficiency and only slight increases in long-term water-use efficiency (+2.5%) inferred from 13C composition. The responses of traits depended on biological, experimental, and environmental moderators. As experimental duration and N load increased, the responses of LAI and Aarea diminished while that of E increased significantly. The observed patterns of increases in both TLA and E indicate that N deposition will increase the amount of water used by plants. Taken together, N deposition will enhance gross photosynthetic C gain of the terrestrial plants while increasing their water loss to the atmosphere, but the effects on C gain might diminish over time and that on plant water use would be amplified if N deposition persists.

Abstract Image

植物光合作用对氮添加的全球响应模式:荟萃分析
在长期升高的大气氮沉降条件下,需要对植物光合反应机制的理解来可靠地预测陆地碳(C)增益的变化。本文利用240篇期刊文章中的2683项观察结果,进行了一项全球荟萃分析,以揭示N添加对14个光合作用相关性状和影响调节因子的影响。结果表明,在320种陆生植物中,叶氮在质量基础(Nmass, +18.4%)和面积基础(Narea, +14.3%)上均显著增加,而比叶面积和每面积叶质量没有变化。总叶面积(TLA)显著增加,叶片总生物量(+46.5%)、单株叶面积(+29.7%)和叶面积指数(+ 24.4%)显著增加。氮素对叶片单位面积光合速率(Aarea, +12.6%)、气孔导度(gs, +7.5%)和蒸腾速率(E, +10.5%)的显著提高程度低于TLA处理。面积的响应与gs的响应呈正相关,瞬时水分利用效率没有变化,从13C组成推断,长期水分利用效率仅略有增加(+2.5%)。性状的反应依赖于生物、实验和环境调节因子。随着实验时间和N负荷的增加,LAI和area的响应降低,而E的响应显著增加。观察到的TLA和E的增加模式表明,N沉降会增加植物的耗水量。综上所述,氮沉降会增加陆生植物的总光合C增益,同时增加其向大气的水分损失,但对C增益的影响可能随着时间的推移而减弱,如果氮沉降持续下去,对植物水分利用的影响将被放大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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