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Comparative Analysis of Drought-Driven Water-Use Strategies in Mangroves and Forests

文献类型： 外文期刊

作者： Li, Xin 1 ; An, Feng 2 ; Wang, You 1 ; Gong, Manyao 1 ; Xu, Huiting 1 ; Zheng, Binbin 1 ; Dong, Lu 1 ; Yu, Rui 1 ;

作者机构： 1.Hainan Univ, Sch Ecol, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

3.Hainan Danzhou Agroecosyst Natl Observat & Res Stn, Danzhou 571737, Peoples R China

4.Hainan Res Acad Environm Sci, Haikou 570228, Peoples R China

5.Ctr Ecoenvironm Restorat Engn Hainan Prov, Haikou 570228, Peoples R China

6.Key Lab Agroforestry Environm Proc & Ecol Regulat, Haikou 570228, Peoples R China

关键词： mangroves; water-use strategy; VPD; salinity stress; carbon gain; carbon cost; osmotic adjustment

期刊名称：FORESTS （ 影响因子：2.5； 五年影响因子：2.7 ）

ISSN：

年卷期： 2025 年 16 卷 3 期

页码：

收录情况： SCI

摘要： Mangroves grow in high-salinity environments with low soil water potential (Psi s), where high light intensity and strong winds increase the vapor pressure deficit (VPD), causing physiological drought and high transpiration demand (Delta w), which limits carbon dioxide (carbon gain) for photosynthesis. This study explored how mangroves optimize their carbon-gain-to-water-loss ratio (water-use strategies) to maximize carbon gain during both dry and rainy seasons. We also calculated the relative costs of key leaf traits and compared them with those of terrestrial forests under the carbon gain optimization model. The results revealed that (1) with increasing Delta w, terrestrial forests primarily adjusted leaf hydraulic conductance (Kleaf), while mangroves altered the difference in water potential (Delta Psi); (2) as Psi s decreased, pi tlp of both terrestrial forests and mangroves increased; (3) terrestrial forests developed a more balanced distribution of leaf trait costs between osmotic pressure (46.7 +/- 0.2%) and stomata (43.3 +/- 1.2%), whereas mangroves had the highest cost in osmotic pressure (49.04 +/- 0.03%) and the lowest cost in stomata (11.08 +/- 3.00%) during the rainy season; and (4) although mangroves showed differences in trait values between dry and rainy seasons, their responses to drought stress remained consistent. These findings provided new theoretical insights into how mangroves maintain high carbon gain and water-use efficiency under extreme environmental conditions, which is important to improve mangrove conservation efforts and contribute to climate mitigation policies.

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