Plant Hydraulics Improves Predictions of ET and GPP Responses to Drought
文献类型：期刊论文
| 作者 | Xie, Shudi; Mo, Xingguo; Liu, Suxia; Hu, Shi |
| 刊名 | WATER RESOURCES RESEARCH
 |
| 出版日期 | 2023-05-01 |
| 卷号 | 59期号:5页码:e2022WR033402 |
| 关键词 | plant hydraulics VIP model water stresses evapotranspiration gross primary production |
| ISSN号 | 1944-7973 |
| DOI | 10.1029/2022WR033402 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Land surface models typically ignore plant hydraulic processes and use empirical soil moisture stress functions to limit transpiration and photosynthesis. How plant hydraulics impacts the predictions of carbon and water fluxes and their responses to drought remains unclear. Here, we developed an analytical plant hydraulic scheme wherein hydraulic capacitances at the leaf level and stem level were considered, and incorporated it into the vegetation interface processes model (hereafter, VIP-PHS). Then, we calibrated the VIP-PHS parameters using a Markov Chain Monte Carlo (MCMC) method and conducted an ecosystem-scale evaluation of the VIP-PHS at 30 FLUXNET sites. The results showed that VIP-PHS improved evapotranspiration (ET) and gross primary production (GPP) simulations across the studied sites, reducing the root mean square error (RMSE) by 0.02-0.27 mm day(-1) and 0.04-0.52 g C m(-2) day(-1) in relation to the empirical soil hydraulic scheme (hereafter, VIP-SHS). VIP-PHS decreased the RMSE in ET and GPP by up to 45% and 55% in evergreen needleleaf forests. Compared to VIP-SHS, VIP-PHS decreased the sensitivities of ET and GPP to soil moisture stress, and significantly improved ET and GPP predictions under low soil moisture conditions. The sensitivity analysis showed that larger stem hydraulic capacitance better relieved xylem water stress, resulting in greater transpiration and GPP and less-negative daily minimum stem water potential. These findings highlight the need to incorporate plant hydraulics into the next generation of Earth system models under future drought conditions. |
| 学科主题 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| WOS关键词 | STEM WATER STORAGE ; STOMATAL CONDUCTANCE ; GAS-EXCHANGE ; SAP FLOW ; SOIL-WATER ; MODEL ; FOREST ; TREE ; TRANSPIRATION ; DYNAMICS |
| WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/193870]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 作者单位 | 1.Chinese Academy of Sciences 2.University of Chinese Academy of Sciences, CAS 3.Institute of Geographic Sciences & Natural Resources Research, CAS |
| 推荐引用方式 GB/T 7714 | Xie, Shudi,Mo, Xingguo,Liu, Suxia,et al. Plant Hydraulics Improves Predictions of ET and GPP Responses to Drought[J]. WATER RESOURCES RESEARCH,2023,59(5):e2022WR033402. |
| APA | Xie, Shudi,Mo, Xingguo,Liu, Suxia,&Hu, Shi.(2023).Plant Hydraulics Improves Predictions of ET and GPP Responses to Drought.WATER RESOURCES RESEARCH,59(5),e2022WR033402. |
| MLA | Xie, Shudi,et al."Plant Hydraulics Improves Predictions of ET and GPP Responses to Drought".WATER RESOURCES RESEARCH 59.5(2023):e2022WR033402. |
入库方式： OAI收割
来源：地理科学与资源研究所
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