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Forest Ecosystems 2022, 9(2): 100021 https://doi.org/10.1016/j.fecs.2022.100021
Research Article | Open Access | Issue | Published: 01 March 2022

Divergent allocations of nonstructural carbohydrates shape growth response to rainfall reduction in two subtropical plantations

Show Author's Information Xinwei Guoa,  Shirong Liua( ),  Hui Wanga,  Zhicheng Chena,  Jinglei Zhanga,  Lin Chenb,c,  Xiuqing Niea,  Lu Zhengb,c,  Daoxiong Caib,c,  Hongyan Jiab,c,  Baoliang Niua
Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, 100091, China
Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang, 532600, China
Youyiguan Forest Ecosystem Research Station, Pingxiang, 532600, China
Keywords:
Photosynthesis, Carbon balance, Tree growth, Nonstructural carbohydrates, Carbon limitation
Cite this article:
Guo X, Liu S, Wang H, et al. Divergent allocations of nonstructural carbohydrates shape growth response to rainfall reduction in two subtropical plantations. Forest Ecosystems, 2022, 9(2): 100021. https://doi.org/10.1016/j.fecs.2022.100021
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Abstract Full text About this article

Nonstructural carbohydrates (NSC) are indicators of tree carbon balance and play an important role in regulating plant growth and survival. However, our understanding of the mechanism underlying drought-induced response of NSC reserves remains limited. Here, we conducted a long-term throughfall exclusion (TFE) experiment to investigate the seasonal responses of NSC reserves to manipulative drought in two contrasting tree species (a broadleaved tree Castanopsis hystrix Miq. and a coniferous tree Pinus massoniana Lamb.) of the subtropical China. We found that in the dry season, the two tree species differed in their responses of NSC reserves to TFE at either the whole-tree level or by organs, with significantly depleted total NSC reserves in roots in both species. Under the TFE treatment, there were significant increases in the NSC pools of leaves and branches in C. hystrix, which were accompanied by significant decreases in fine root biomass and radial growth without significant changes in canopy photosynthesis; while P. massoniana exhibited significant increase in fine root biomass without significant changes in radial growth. Our results suggested that under prolonged water limitation, NSC usage for growth in C. hystrix is somewhat impaired, such that the TFE treatment resulted in NSC accumulation in aboveground organs (leaf and branch); whereas P. massoniana is capable of efficiently utilizing NSC reserves to maintain its growth under drought conditions. Our findings revealed divergent NSC allocations under experimental drought between the two contrasting tree species, which are important for better understanding the differential impacts of climate change on varying forest trees and plantation types in subtropical China.


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Divergent allocations of nonstructural carbohydrates shape growth response to rainfall reduction in two subtropical plantations

Show Author's information Xinwei Guoa, Shirong Liua( ), Hui Wanga, Zhicheng Chena, Jinglei Zhanga, Lin Chenb,c, Xiuqing Niea, Lu Zhengb,c, Daoxiong Caib,c, Hongyan Jiab,c, Baoliang Niua
Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, 100091, China
Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang, 532600, China
Youyiguan Forest Ecosystem Research Station, Pingxiang, 532600, China

Abstract

Nonstructural carbohydrates (NSC) are indicators of tree carbon balance and play an important role in regulating plant growth and survival. However, our understanding of the mechanism underlying drought-induced response of NSC reserves remains limited. Here, we conducted a long-term throughfall exclusion (TFE) experiment to investigate the seasonal responses of NSC reserves to manipulative drought in two contrasting tree species (a broadleaved tree Castanopsis hystrix Miq. and a coniferous tree Pinus massoniana Lamb.) of the subtropical China. We found that in the dry season, the two tree species differed in their responses of NSC reserves to TFE at either the whole-tree level or by organs, with significantly depleted total NSC reserves in roots in both species. Under the TFE treatment, there were significant increases in the NSC pools of leaves and branches in C. hystrix, which were accompanied by significant decreases in fine root biomass and radial growth without significant changes in canopy photosynthesis; while P. massoniana exhibited significant increase in fine root biomass without significant changes in radial growth. Our results suggested that under prolonged water limitation, NSC usage for growth in C. hystrix is somewhat impaired, such that the TFE treatment resulted in NSC accumulation in aboveground organs (leaf and branch); whereas P. massoniana is capable of efficiently utilizing NSC reserves to maintain its growth under drought conditions. Our findings revealed divergent NSC allocations under experimental drought between the two contrasting tree species, which are important for better understanding the differential impacts of climate change on varying forest trees and plantation types in subtropical China.

Keywords: Photosynthesis, Carbon balance, Tree growth, Nonstructural carbohydrates, Carbon limitation

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Received: 21 January 2022
Revised: 19 February 2022
Accepted: 20 February 2022
Published: 01 March 2022
Issue date: April 2022

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© 2022 Beijing Forestry University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

Acknowledgements

Acknowledgements

We would like to thank the Youyiguan Forest Ecosystem Research Station for experimental and logistic support, and Chaoyin Li, Zhanchao Song and Weijian Jiang for assistance in fieldwork and laboratory analyses. This study was jointly supported by the National Natural Science Foundation of China (Grant No. 31930078) and the Ministry of Science and Technology of China for Key R & D Program (Grant No. 2021YFD2200405). Authors are also grateful to two anonymous reviewers for constructive comments and editorial suggestions over a previous version of the manuscript.

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