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      Canopy nitrogen addition enhance the photosynthetic rate of canopy species by improving leaf hydraulic conductivity in a subtropical forest

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          Abstract

          Elucidating the effects of atmospheric nitrogen (N) deposition on the photosynthetic capacity of plants is critical to understand forest growth and conservation under global change. However, studies on this topic generally consider only understory N addition, which ignores the effect of canopy interception. In this study, we conducted a field experiment in a subtropical forest to compare the effects of canopy vs. understory N addition on the photosynthetic rate of canopy and understory species. We found that canopy N addition enhanced the photosynthetic rate of canopy species by increasing leaf hydraulic conductivity and shortening the distance of CO 2 transportation. In contrast, understory N addition had non-significant effects on the photosynthetic rate of canopy species. Moreover, the photosynthetic rate of understory species was not affected by canopy or understory N addition. Interestingly, changes in hydraulic conductivity contributed more to accelerating the photosynthetic rate than changes in CO 2 transport distance. Our results provide important insights into the dissimilar effects of canopy and understory N addition on the photosynthetic rates of species in subtropical forests. Based on our findings, we highlighted the urgent need to consider canopy processes in future studies on N deposition.

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          Transformation of the nitrogen cycle: recent trends, questions, and potential solutions.

          Humans continue to transform the global nitrogen cycle at a record pace, reflecting an increased combustion of fossil fuels, growing demand for nitrogen in agriculture and industry, and pervasive inefficiencies in its use. Much anthropogenic nitrogen is lost to air, water, and land to cause a cascade of environmental and human health problems. Simultaneously, food production in some parts of the world is nitrogen-deficient, highlighting inequities in the distribution of nitrogen-containing fertilizers. Optimizing the need for a key human resource while minimizing its negative consequences requires an integrated interdisciplinary approach and the development of strategies to decrease nitrogen-containing waste.
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            HUMAN ALTERATION OF THE GLOBAL NITROGEN CYCLE: SOURCES AND CONSEQUENCES

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              Nitrogen Cycles: Past, Present, and Future

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                Author and article information

                Contributors
                Journal
                Front Plant Sci
                Front Plant Sci
                Front. Plant Sci.
                Frontiers in Plant Science
                Frontiers Media S.A.
                1664-462X
                05 August 2022
                2022
                : 13
                : 942851
                Affiliations
                [1] 1Hainan Jianfengling Forest Ecosystem National Field Science Observation and Research Station, Research Institute of Tropical Forestry, Chinese Academy of Forestry , Guangzhou, China
                [2] 2Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences , Guangzhou, China
                Author notes

                Edited by: Yanbo Hu, Northeast Forestry University, China

                Reviewed by: Yunting Fang, Institute of Applied Ecology (CAS), China; Guoyong Yan, Qufu Normal University, China; Dong Wang, Henan University, China

                *Correspondence: Dexiang Chen, dchen@ 123456caf.ac.cn

                This article was submitted to Plant Nutrition, a section of the journal Frontiers in Plant Science

                Article
                10.3389/fpls.2022.942851
                9389171
                c97c81aa-cb29-4b39-bab4-369365f4d0fd
                Copyright © 2022 Wu, Chen, Zhou, Ye and Wu.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 13 May 2022
                : 13 July 2022
                Page count
                Figures: 5, Tables: 0, Equations: 2, References: 41, Pages: 9, Words: 5561
                Funding
                Funded by: Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences, doi 10.13039/501100013211;
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Categories
                Plant Science
                Original Research

                Plant science & Botany
                canopy n addition,photosynthetic rate,leaf hydraulic conductivity,co2 transportation distance,understory n addition

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