干旱区生态环境知识资源中心(Arid): New Representation of Plant Hydraulics Improves the Estimates of Transpiration in Land Surface Model

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DOI	10.3390/f12060722
	New Representation of Plant Hydraulics Improves the Estimates of Transpiration in Land Surface Model
	Li, Hongmei; Lu, Xingjie; Wei, Zhongwang; Zhu, Siguang; Wei, Nan; Zhang, Shupeng; Yuan, Hua; Shangguan, Wei; Liu, Shaofeng; Zhang, Shulei; Huang, Jianfeng; Dai, Yongjiu
通讯作者	Lu, XJ (corresponding author), Sun Yat Sen Univ, Sch Atmospher Sci, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou 510275, Peoples R China.
来源期刊	FORESTS
EISSN	1999-4907
出版年	2021
卷号	12 期号:6
英文摘要	Transpiration represents more than 30% of the global land-atmosphere water exchange but is highly uncertain. Plant hydraulics was ignored in traditional land surface modeling, but recently plant hydraulics has been found to play an essential role in transpiration simulation. A new physical-based representation of plant hydraulic schemes (PHS) was recently developed and implemented in the Common Land Model (CoLM). However, it is unclear to what extent PHS can reduce these uncertainties. Here, we evaluated the PHS against measurements obtained at 81 FLUXNET sites. The transpiration of each site was estimated using an empirical evapotranspiration partitioning approach. The metric scores defined by the International Land Model Benchmarking Project (ILAMB) were used to evaluate the model performance and compare it with that of the CoLM default scheme (soil moisture stress (SMS)). The bias score of transpiration in PHS was higher than SMS for most sites, and more significant improvements were found in semi-arid and arid sites where transpiration was limited by soil moisture. The hydraulic redistribution in PHS optimized the soil water supply and thus improved the transpiration estimates. In humid sites, no significant improvement in seasonal or interannual variability of transpiration was simulated by PHS, which can be explained by the insensitivity of transpiration demand coupled to the photosynthesis response to precipitation. In arid and semi-arid sites, seasonal or interannual variability of transpiration was better captured by PHS than SMS, which was interpreted by the improved drought sensitivity for transpiration. Arid land is widespread and is expected to expand due to climate change, thus there is an urgent need to couple PHS in land surface models.
英文关键词	transpiration plant hydraulics hydraulic redistribution benchmarking analysis land surface model
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000666314400001
WOS关键词	SOIL EVAPORATION ; EXTREME DROUGHT ; WATER-UPTAKE ; REDISTRIBUTION ; VULNERABILITY ; FOREST ; ROOTS ; XYLEM ; CYCLE ; UNCERTAINTIES
WOS类目	Forestry
WOS研究方向	Forestry
来源机构	南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350249
作者单位	[Li, Hongmei; Lu, Xingjie; Wei, Zhongwang; Wei, Nan; Zhang, Shupeng; Yuan, Hua; Shangguan, Wei; Liu, Shaofeng; Zhang, Shulei; Huang, Jianfeng; Dai, Yongjiu] Sun Yat Sen Univ, Sch Atmospher Sci, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou 510275, Peoples R China; [Zhu, Siguang] Nanjing Univ Informat Sci & Technol NUIST, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Int Joint Res Lab Climate & Environm Change, Key Lab Meteorol Disaster,Minist Educ, Nanjing 210044, Peoples R China; [Zhu, Siguang] Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing 210044, Peoples R China
推荐引用方式 GB/T 7714	Li, Hongmei,Lu, Xingjie,Wei, Zhongwang,et al. New Representation of Plant Hydraulics Improves the Estimates of Transpiration in Land Surface Model[J]. 南京信息工程大学,2021,12(6).
APA	Li, Hongmei.,Lu, Xingjie.,Wei, Zhongwang.,Zhu, Siguang.,Wei, Nan.,...&Dai, Yongjiu.(2021).New Representation of Plant Hydraulics Improves the Estimates of Transpiration in Land Surface Model.FORESTS,12(6).
MLA	Li, Hongmei,et al."New Representation of Plant Hydraulics Improves the Estimates of Transpiration in Land Surface Model".FORESTS 12.6(2021).