干旱区生态环境知识资源中心(Arid): Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China

Arid

DOI	10.1007/s11676-023-01619-0
	Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China
	Yu, Songping; Guo, Jianbin; Liu, Zebin; Wang, Yanhui; Xu, Lihong; Yu, Pengtao; He, Liang
通讯作者	Guo, JB
来源期刊	JOURNAL OF FORESTRY RESEARCH
ISSN	1007-662X
EISSN	1993-0607
出版年	2023
卷号	34 期号:6 页码:1927-1940
英文摘要	Nighttime sap flow (Q(n)) is an important physiological activity under which trees manage drought stress. An in-depth understanding of the characteristics of Q(n) and its response to environmental and canopy conditions are of significance for arid area forest and water management. This study measured daily sap flow (Q(s)) of a Larix principis-rupprechtii plantation in the Liupan Mountains, northwest China during the 2017-2019 growing seasons, and separated Q(s) into daytime sap flow (Q(d)) and Q(n). Meteorological conditions (reference evapotranspiration, ETref), canopy structure (leaf area index, LAI), and soil moisture (relative soil water content, RSWC) were considered as the main biophysical factors affecting Q(n). The structural equation model and upper boundary line method determined the effects of compound and single factors on Q(n). The daily mean Q(n) values during the growing seasons in 2017, 2018, and 2019 were 0.024, 0.026, and 0.030 mm d(-1), accounting for 6.2, 11.2, and 10.1% of Q(s), respectively. Q(n) at different canopy development phases (leaf expanding, LG; leaf expanded, LD; and defoliation, DF) over three years was LD > LG > DF. Q(n) increased with increasing ETref, whereas the ratio of Q(n) to Q(s) decreased. Q(n) did not show regular variation in the three-year growing seasons under different soil moisture conditions. ETref and LAI mainly controlled Q(n) by affecting Q(d), whereas RSWC had no significant effect on Q(n). Q(n) had a positive and linear relationship with LAI and a quadratic relationship with ETref. Both explained 40% of variation in Q(n). Meteorological and canopy conditions are important factors affecting Q(n) on the semi-humid study site. The application of the Q(n) model coupled with the impact of ETref and LAI furthers understanding of the impacts of climate and forest structure change on Q(n).
英文关键词	Nighttime sap flow Reference evapotranspiration Leaf area index Soil moisture Multi-factor impact
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000999582200004
WOS关键词	NOCTURNAL WATER-LOSS ; STOMATAL CONDUCTANCE ; SOIL-WATER ; POPULUS-EUPHRATICA ; LOESS PLATEAU ; WOODY-PLANTS ; TRANSPIRATION ; TREE ; DROUGHT ; FOREST
WOS类目	Forestry
WOS研究方向	Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397328
推荐引用方式 GB/T 7714	Yu, Songping,Guo, Jianbin,Liu, Zebin,et al. Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China[J],2023,34(6):1927-1940.
APA	Yu, Songping.,Guo, Jianbin.,Liu, Zebin.,Wang, Yanhui.,Xu, Lihong.,...&He, Liang.(2023).Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China.JOURNAL OF FORESTRY RESEARCH,34(6),1927-1940.
MLA	Yu, Songping,et al."Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains, China".JOURNAL OF FORESTRY RESEARCH 34.6(2023):1927-1940.