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A global meta-analysis of woody plant responses to elevated CO_(2):implications on biomass,growth,leaf N content,photosynthesis and water relations

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Ecological Processes 2022年第1期11卷 723-743页

作者： Mthunzi Mndela Julius T.Tjelele Ignacio C.Madakadze Mziwanda Mangwane Igshaan M.Samuels francuois muller Hosia T.Pule Applied Behavioural Ecology and Ecosystem Research Unit(ABEERU) Department of Environmental SciencesUNISAPrivate Bag X6Florida 1710South Africa Agricultural Research Council APIP/Bag X02IrenePretoria 0062South Africa University of Pretoria P/Bag X20HatfieldPretoria 0028South Africa

Background:Atmospheric CO_(2)may double by the year 2100,thereby altering plant growth,photosynthesis,leaf nutrient contents and water ***,atmospheric CO_(2)is currently 50%higher than pre-industrial levels and is projected to rise as high as 936μmol mol^(−1)under worst-case scenario in *** objective of the study was to investigate the effects of elevated CO_(2)on woody plant growth,production,photosynthetic characteristics,leaf N and water ***:A meta-analysis of 611 observations from 100 peer-reviewed articles published from 1985 to 2021 was *** selected articles in which elevated CO_(2)and ambient CO_(2)range from 600–1000 and 300–400μmol mol^(−1),*** CO_(2)was categorized into700μmol mol^(−1)***:Total biomass increased similarly across the three elevated CO_(2)concentrations,with leguminous trees(LTs)investing more biomass to shoot,whereas non-leguminous trees(NLTs)invested to root *** area index,shoot height,and light-saturated photosynthesis(A_(max))were unresponsive at700μmol mol^(−1).However,shoot biomass and A_(max)acclimatized as the duration of woody plants exposure to elevated CO_(2)*** rate of photosynthetic Rubisco carboxylation(V_(cmax))and apparent maximum rate of photosynthetic electron transport(J_(max))were *** CO_(2)reduced stomatal conductance(g_(s))by 32%on average and increased water use efficiency by 34,43 and 63%for700μmol mol^(−1),*** N content decreased two times more in NLTs than LTs growing at elevated CO_(2)than ambient CO_(2).Conclusions:Our results suggest that woody plants will benefit from elevated CO_(2)through increased photosyn-thetic rate,productivity and improved water status,but the responses will vary by woody plant traits and length of exposure to elevated CO_(2).

关键词： Atmospheric CO_(2) Biomass production Leaf nitrogen content Meta-analysis Photosynthetic rate Stomatal conductance Water use efficiency Woody plants

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