干旱区生态环境知识资源中心(Arid): The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China

Arid

DOI	10.1016/j.agrformet.2023.109468
	The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China
	Li, Jiamei; Yu, Pengtao; Wan, Yanfang; Wang, Yanhui; Yu, Yipeng; Liu, Bingbing; Pan, Lei; Xu, Lihong; Liu, Zebin; Wang, Xiao
通讯作者	Yu, PT
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2023
卷号	336
英文摘要	Climate warming will cause more frequent drought events in arid regions with rain shortage, especially seasonal droughts, with strong impacts on tree transpiration. Tree transpiration responses to drought are further affected by competition among trees that can be quantified using Hegyi competition indice (HCI). However, how seasonal drought affects tree transpiration among conpetitive pressures remains poorly understood. In this study, the daily transpiration of twenty-four trees with different competition pressures was monitored using the thermal dissipation probe method from May to October from 2019 to 2021 in a larch plantation in the Liupan Mountains, Northwest China. Our results showed that the daily tree transpiration normalized for the mean daytime vapor pressure deficit (Ti-VPD, L center dot d(-1)center dot kPa(-1)) declined during drought, especially during summer drought. Seasonal drought weakened the tree competitive effects on Ti-VPD, with spring droughts reducing the difference of Ti-VPD in summer among different competition pressure levels, while summer droughts invalidate competitive effects, i.e., there was no significant difference (p < 0.05) of Ti-VPD in summer with different competition pressure levels. In addition, low competition (LC) showed a much greater Ti-VPD reduction than did moderate competition (MC) and heavy competition (HC) during periods of drought, suggesting that the Ti-VPD was more sensitive to seasonal drought under lower competitive pressure. The dominant factor contributing to the changes in tree transpiration was solar radiation in spring drought (2020) and soil relative extractable water in summer drought (2021). Besides, due to the seasonal drought, the water consumed by transpiration of the LC and MC groups was significantly smaller than that of the HC groups. These results demonstrate that crop tree management can be implemented to reduce water consumption by thinning trees which are under heavy competitive pressure (i.e., DBH < 18 cm) and can be used to enhance the drought resistance of reserved trees to seasonal drought to better achieve integrated forest-water management.
英文关键词	Seasonal drought Competitive pressure Transpiration Larix principis-rupprechtii
类型	Review
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000989086600001
WOS关键词	SOCIAL POSITION ; WATER-BALANCE ; LEAF-AREA ; GROWTH ; FOREST ; DENSITY ; INDEX ; PINE ; SOIL ; OAK
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395004
推荐引用方式 GB/T 7714	Li, Jiamei,Yu, Pengtao,Wan, Yanfang,et al. The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China[J],2023,336.
APA	Li, Jiamei.,Yu, Pengtao.,Wan, Yanfang.,Wang, Yanhui.,Yu, Yipeng.,...&Wang, Xiao.(2023).The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China.AGRICULTURAL AND FOREST METEOROLOGY,336.
MLA	Li, Jiamei,et al."The differential responses of tree transpiration to seasonal drought among competitive pressures in a larch plantation of northwest China".AGRICULTURAL AND FOREST METEOROLOGY 336(2023).