Global response patterns of plant photosynthesis to nitrogen addition: A meta-analysis.,Global Change Biology

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Global response patterns of plant photosynthesis to nitrogen addition: A meta-analysis.
Global Change Biology ( IF 10.8 ) Pub Date : 2020-04-08 , DOI: 10.1111/gcb.15071
Xingyun Liang _{1,

2,

3} , Tong Zhang _{1,

4} , Xiankai Lu ₁ , David S Ellsworth ₅ , Hormoz BassiriRad ₆ , Chengming You ₇ , Dong Wang ₈ , Pengcheng He _{1,

4} , Qi Deng _{1,

3} , Hui Liu _{1,

3} , Jiangming Mo ₁ , Qing Ye _{1,

2,

3}

Affiliation

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 13 C 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.

中文翻译：

植物光合作用对氮添加的总体响应模式：一项荟萃分析。

需要机械理解植物的光合作用，才能可靠地预测在大气氮（N）长期升高的条件下陆地碳（C）增益的变化。在这里，我们使用来自240篇期刊文章的2683条观察结果，进行了一项全球荟萃分析，揭示了氮素添加对14种光合作用相关性状的影响，并影响了主持人。我们发现，在320种陆生植物物种中，叶N在质量（Nmass，+ 18.4％）和面积（Narea，+ 14.3％）上相对提高，而比叶面积或每单位面积的叶质量没有变化。总叶面积（TLA）显着增加，如总叶生物量（+ 46.5％），每株植物叶面积（+ 29.7％）和叶面积指数（LAI，+ 24.4％）所示。在比TLA少的程度上，氮的添加显着提高了单位面积的叶片光合速率（面积，+ 12.6％），气孔导度（gs，+ 7.5％）和蒸腾速率（E，+ 10.5％）。Aarea的响应与gs的响应呈正相关，从13 C组成推断，瞬时用水效率没有变化，长期用水效率仅略有增加（+ 2.5％）。性状的反应取决于生物学，实验和环境调节剂。随着实验时间和氮负荷的增加，LAI和Aarea的响应减弱，而E的响应显着增加。观察到的TLA和E均增加的模式表明，N的沉积将增加植物使用的水量。在一起

更新日期：2020-03-07

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