干旱区生态环境知识资源中心(Arid): Higher canopy transpiration rates induced dieback in poplar (Populus x xiaozhuanica) plantations in a semiarid sandy region of Northeast China

Arid

DOI	10.1016/j.agwat.2020.106414
	Higher canopy transpiration rates induced dieback in poplar (Populus x xiaozhuanica) plantations in a semiarid sandy region of Northeast China
	Song, Lining; Zhu, Jiaojun; Zhang, Ting; Wang, Kai; Wang, Guochen; Liu, Jianhua
通讯作者	Zhu, JJ (corresponding author), Chinese Acad Sci, Inst Appl Ecol, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2021
卷号	243
英文摘要	Poplar (Populus x xiaozhuanica) plantations play an important role in controlling desertification in semiarid sandy regions of Northeast China, but their dieback occurs frequently in extreme drought years due to greater water loss by transpiration than water uptake. However, little is known about dynamics of canopy transpiration in poplar plantations, which limits our understanding of dieback mechanisms and proper management of these poplar plantations. Here, canopy transpiration and canopy conductance in 18-year-old poplar plantations were quantified by sap flow measurements in combination with monitoring of concurrent environmental variables during two consecutive growing seasons in normal and wet years (2018 and 2019). Results showed that daily canopy transpiration averaged 1.2 mm d(-1) (between 0.3 and 1.9 mm d(-1)) and 1.5 mm d(-1) (between 0.2 and 2.4 mm d(-1)) in 2018 and 2019, respectively. Solar radiation explained more variability of daily canopy transpiration than vapor pressure deficit (VPD) in both years, indicating that canopy transpiration was more controlled by radiation than by VPD. Total canopy transpiration during the growing seasons in 2018 and 2019 was 184.1 mm and 235.9 mm, respectively, accounting for 47.1 % and 44.2 % of precipitation over the same period. Sum of canopy transpiration, soil evaporation and change in soil water storage was higher than precipitation in most months, indicating that trees took up water from deep soil layer (> 1.0 m) and groundwater. Additionally, canopy conductance averaged 1.4 m s(-1) and 1.9 m s(-1) in 2018 and 2019, respectively, and decreased significantly with increasing VPD. However, sensitivity of canopy conductance to VPD decreased from 0.62 in 2018 to 0.27 in 2019, indicating a shift from more to less strict stomatal regulation. These findings indicate that poplar plantations are vulnerable to dieback during extreme drought years with decline in groundwater level due to utilization of groundwater for higher canopy transpiration rate.
英文关键词	Sap flow Solar radiation Groundwater Canopy conductance
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000594658700004
WOS关键词	SYLVESTRIS VAR. MONGOLICA ; INLAND RIVER-BASIN ; SAP FLOW ; STOMATAL CONDUCTANCE ; WATER-USE ; TREE TRANSPIRATION ; FOREST TRANSPIRATION ; GROUNDWATER-TABLE ; STAND DENSITY ; SHELTER-BELT
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347675
作者单位	[Song, Lining; Zhu, Jiaojun; Zhang, Ting] Chinese Acad Sci, Inst Appl Ecol, Key Lab Forest Ecol & Management, Shenyang 110016, Peoples R China; [Song, Lining; Zhu, Jiaojun; Zhang, Ting] Chinese Acad Sci, Qingyuan Forest CERN, Shenyang 110016, Peoples R China; [Song, Lining; Zhu, Jiaojun; Zhang, Ting] Key Lab Management Noncommercial Forests, Shenyang 110016, Liaoning, Peoples R China; [Wang, Kai] Liaoning Tech Univ, Coll Environm Sci & Engn, Fuxing 123000, Peoples R China; [Wang, Guochen; Liu, Jianhua] Liaoning Inst Sandy Land Control & Utilizat, Fuxing 123000, Peoples R China
推荐引用方式 GB/T 7714	Song, Lining,Zhu, Jiaojun,Zhang, Ting,et al. Higher canopy transpiration rates induced dieback in poplar (Populus x xiaozhuanica) plantations in a semiarid sandy region of Northeast China[J],2021,243.
APA	Song, Lining,Zhu, Jiaojun,Zhang, Ting,Wang, Kai,Wang, Guochen,&Liu, Jianhua.(2021).Higher canopy transpiration rates induced dieback in poplar (Populus x xiaozhuanica) plantations in a semiarid sandy region of Northeast China.AGRICULTURAL WATER MANAGEMENT,243.
MLA	Song, Lining,et al."Higher canopy transpiration rates induced dieback in poplar (Populus x xiaozhuanica) plantations in a semiarid sandy region of Northeast China".AGRICULTURAL WATER MANAGEMENT 243(2021).