Nitrogen addition affects plant biomass allocation but not allometric relationships among different organs across the globe
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Nitrogen addition affects plant biomass allocation but not allometric relationships among different organs across the globe. / Yue, Kai; Fornara, Dario A; Li, Wang; Ni, Xiangyin; Peng, Yan; Liao, Shu; Tan, Siyi; Wang, Dingyi; Wu, Fuzhong; Yang, Yusheng; Liu, Lingli.
I: Journal of Plant Ecology, Bind 14, Nr. 3, 01.06.2021, s. 361-371.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Nitrogen addition affects plant biomass allocation but not allometric relationships among different organs across the globe
AU - Yue, Kai
AU - Fornara, Dario A
AU - Li, Wang
AU - Ni, Xiangyin
AU - Peng, Yan
AU - Liao, Shu
AU - Tan, Siyi
AU - Wang, Dingyi
AU - Wu, Fuzhong
AU - Yang, Yusheng
AU - Liu, Lingli
PY - 2021/6/1
Y1 - 2021/6/1
N2 - AimsBiomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments; yet, it remains poorly understood how patterns of biomass allocation respond to nitrogen (N) additions across terrestrial ecosystems worldwide.MethodsWe conducted a meta-analysis using 5474 pairwise observations from 333 articles to assess how N addition affected plant biomass and biomass allocation among different organs. We also tested the ‘ratio-based optimal partitioning’ vs. the ‘isometric allocation’ hypotheses to explain potential N addition effects on biomass allocation.Important FindingsWe found that (i) N addition significantly increased whole plant biomass and the biomass of different organs, but decreased root:shoot ratio (RS) and root mass fraction (RMF) while no effects of N addition on leaf mass fraction and stem mass fraction at the global scale; (ii) the effects of N addition on ratio-based biomass allocation were mediated by individual or interactive effects of moderator variables such as experimental conditions, plant functional types, latitudes and rates of N addition and (iii) N addition did not affect allometric relationships among different organs, suggesting that decreases in RS and RMF may result from isometric allocation patterns following increases in whole plant biomass. Despite alteration of ratio-based biomass allocation between root and shoot by N addition, the unaffected allometric scaling relationships among different organs (including root vs. shoot) suggest that plant biomass allocation patterns are more appropriately explained by the isometric allocation hypothesis rather than the optimal partitioning hypothesis. Our findings contribute to better understand N-induced effects on allometric relationships of terrestrial plants, and suggest that these ecophysiological responses should be incorporated into models that aim to predict how terrestrial ecosystems may respond to enhanced N deposition under future global change scenarios.
AB - AimsBiomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments; yet, it remains poorly understood how patterns of biomass allocation respond to nitrogen (N) additions across terrestrial ecosystems worldwide.MethodsWe conducted a meta-analysis using 5474 pairwise observations from 333 articles to assess how N addition affected plant biomass and biomass allocation among different organs. We also tested the ‘ratio-based optimal partitioning’ vs. the ‘isometric allocation’ hypotheses to explain potential N addition effects on biomass allocation.Important FindingsWe found that (i) N addition significantly increased whole plant biomass and the biomass of different organs, but decreased root:shoot ratio (RS) and root mass fraction (RMF) while no effects of N addition on leaf mass fraction and stem mass fraction at the global scale; (ii) the effects of N addition on ratio-based biomass allocation were mediated by individual or interactive effects of moderator variables such as experimental conditions, plant functional types, latitudes and rates of N addition and (iii) N addition did not affect allometric relationships among different organs, suggesting that decreases in RS and RMF may result from isometric allocation patterns following increases in whole plant biomass. Despite alteration of ratio-based biomass allocation between root and shoot by N addition, the unaffected allometric scaling relationships among different organs (including root vs. shoot) suggest that plant biomass allocation patterns are more appropriately explained by the isometric allocation hypothesis rather than the optimal partitioning hypothesis. Our findings contribute to better understand N-induced effects on allometric relationships of terrestrial plants, and suggest that these ecophysiological responses should be incorporated into models that aim to predict how terrestrial ecosystems may respond to enhanced N deposition under future global change scenarios.
U2 - 10.1093/jpe/rtaa100
DO - 10.1093/jpe/rtaa100
M3 - Journal article
VL - 14
SP - 361
EP - 371
JO - Chinese Journal of Plant Ecology
JF - Chinese Journal of Plant Ecology
SN - 1005-264X
IS - 3
ER -
ID: 272028266