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Trajectories in nitrogen availability during forest secondary succession:illustrated by foliarδ^(15)N

Ecological Processes 2022年第1期11卷 400-410页

作者： Ying Tu Ang Wang Feifei Zhu Geshere Abdisa Gurmesa Erik A.Hobbie Weixing Zhu Yunting Fang CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyangChina Qingyuan Forest CERN ShenyangChina Key Laboratory of Stable Isotope Techniques and Applications ShenyangLiaoning ProvinceChina Earth Systems Research Center Morse HallUniversity of New HampshireDurhamNHUSA Department of Biological Sciences Binghamton UniversityThe State University of New YorkBinghamtonNYUSA University of Chinese Academy of Sciences BeijingChina

Background:Forest succession is an important ecological process and has been studied for more than a ***,changes in nitrogen(N)availability during succession remain unclear as they may lead to either N satura-tion or N ***,we propose a conceptual model to illustrate changes in N availability during four stages of secondary succession using the natural abundance of ^(15) N in plant leaves(foliarδ^(15)N).We predicted that N availability would decline in the early stages of succession and then increase in late stages,coinciding with the changes in foliarδ^(15)N,with the inflection point varying in different climate *** on foliarδ^(15)N from 16 succession sequences were synthesized to explore changes in N availability during forest ***:The compiled data were consistent with the proposed conceptual ***δ^(15)N in boreal and temperate forests decreased significantly in the first two stages of succession(estimated to last at least 66 years in temperate forests),at a rate of 0.18‰and 0.38‰per decade,respectively,and decreased slightly in tropical forests in the first 23 ***δ^(15)N is projected to increase in later stages in all forests,which is supported by observations in both temperate and tropical *** inflection points of N availability when N limitation peaked during succession were different in different climate zones,implying different ecosystem N ***:Our study reconciles the controversies regarding changes in N availability during forest secondary *** findings are also useful for predicting the recovery of N and carbon accumulation during ***,studies on forest secondary succession using foliarδ^(15)N have thus far been limited,and more research should be conducted to further verify the conceptual model proposed here.

关键词： Foliarδ^(15)N Forest secondary succession Nitrogen availability Space-for-time substitution

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In-situ warming does not change soil priming effect induced by glucose addition in a temperate forest

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Pedosphere 2024年第4期34卷 759-769页

作者： Xiaohan DONG Yunting FANG Dongwei LIU Xin GUAN Kai HUANG Yuqi LIU Qingkui WANG Silong WANG Weidong ZHANG Huitong Experimental Station of Forest Ecology CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyShenyang 110016China University of Chinese Academy of Sciences Beijing 101408China Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest Huitong National Research Station of Forest EcosystemHuitong 418307China Qingyuan Forest Chinese Ecosystem Research Network(CERN) National Observation and Research StationShenyang 110016China Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016(China)f Key Laboratory of Stable Isotope Techniques and ApplicationsShenyang 110016China Key Laboratory of Terrestrial Ecosystem Carbon Neutrality Shenyang 110016China

Priming effect(PE)on soil organic carbon(SOC)decomposition caused by the addition of organic carbon(C)is an important ecological process in regulating soil C ***,most priming studies are confined to laboratory trials,while the assessment of soil PE under field conditions with variable weather conditions is *** study assessed the direct effects of glucose addition and in-situ warming on the extent of PE under field conditions in a temperate *** evaluated soil PE using 13C-glucose labelling,a simple and novel technique,based on the Keeling plot *** addition significantly enhanced native SOC decomposition and induced strong ***,the effect of in-situ warming on the extent of PE was not *** study confirms the importance of PE in regulating SOC turnover under field conditions.

关键词： lue lblling tchnquegbal wamingrmingt hppidfaty ai solganmattermineralisatn oezme respiration

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Nitrogen uptake strategies of mature conifers in Northeastern china, illustrated by the ^(15)N natural abundance method

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Ecological Processes 2021年第1期10卷 470-480页

作者： Xulun Zhou Ang Wang Erik A.Hobbie Feifei Zhu Xueyan Wang Yinghua Li Yunting Fang School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China Key Laboratory of Stable Isotope Techniques and Applications Shenyang 110016Liaoning ProvinceChina .4 Qingyuan Forest CERN Shenyang 110016China Earth Systems Research Center Morse HallUniversity of New HampshireDurhamNHUSA School of Energy and Water Resources Shenyang Institute of TechnologyFushun 113122China.

Background:Conifers partition different N forms from soil,including ammonium,nitrate,and dissolved organic N(DON),to sustain plant *** studies focused on inorganic N sources and specific amino acid forms using ^(15)N labelling,but knowledge of the contribution of DON to mature conifers’N uptake is still ***,we quantified the contribution of different N forms(DON ***_(4)^(+)***_(3)^(−))to total N uptake,based on ^(15)N natural abundance of plant and soil available N,in four mature conifers(Pinus koraiensis,Pinus sylvestris,Picea koraiensis,and Larix olgensis).Results:DON contributed 31%,29%,28%,and 24%to total N uptake by Larix olgensis,Picea koraiensis,Pinus koraiensis,and Pinus sylvestris,respectively,whereas nitrate contributed 42 to 52%and ammonium contributed 19 to 29%of total N uptake for these four coniferous ***:Our results suggested that all four conifers could take up a relatively large proportion of nitrate,while DON was also an important N source for the four *** that DON was the dominant N form in study soil,such uptake pattern of conifers could be an adaptive strategy for plants to compete for the limited available N sources from soil so as to promote conifer growth and maintain species coexistence.

关键词： Nitrogen uptake preference Organic nitrogen Inorganic nitrogen Coniferous plantation ^(15)N natural abundance Isotopic mixing model

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