气候变化领域集成服务门户(CCPortal): Coordination of stomatal control and stem water storage on plant water use in desert riparian trees

CCPortal

DOI	10.1007/s00468-019-01816-7
	Coordination of stomatal control and stem water storage on plant water use in desert riparian trees
	Yu, Tengfei; Feng, Qi; Si, Jianhua; Pinkard, Elizabeth A.
发表日期	2019
ISSN	0931-1890
EISSN	1432-2285
卷号	33 期号:3
英文摘要	Populus euphratica Oliv. is a relatively conservative' water user even when growing in favourable water conditions, but the mechanistic understanding of this has received little attention. We undertook an experiment to determine trees water use by measuring stem and root sap flow (F-s), variation in stem diameter (D-s), leaf stomatal gas-exchange (e.g. conductance, g(s) and transpiration, T-r) and water potential mml:mfenced close=) open=(Lmml:mfenced during the growing season for P. euphratica. There was a hysteretic apparent feedforward' of stomatal response to increasing VPD. Mean of g(s) was not significantly different among months. L was negatively related to g(s) and T-r, but in contrast, stem F-s was positively associated to T-r but not to g(s). There was no lag in the daily onset and cessation of F-s between the bottom and top of the trunk, possibly due to the short distance between measurement points (about 2m), however, the lag time in F-s between the bottom of the trunk and roots, approximately 30min, suggested that stored water was withdrawn first from the trunk and subsequently the roots. Daily contraction of D-s (-D-s) increased with increasing F-s during both day and night, and expansion of D-s (+D-s) showed a logarithmic rise to a maximum with increasing F-s during the day. Day F-s and -D-s were also logarithmic with respect to VPD, with a correlation coefficient equal to 0.51 and 0.50, respectively (P<0.001). This suggests that water use of P. euphratica was determined by the stomatal control and stem water storage together, which has great significance for the species buffers xylem water deficit, maintaining high leaf production, and water use efficiency.
关键词	Stem water storage Stomatal control Stem diameter variations Sap flow Riparian forest Populus
学科领域	Forestry
语种	英语
WOS研究方向	Forestry
来源期刊	TREES-STRUCTURE AND FUNCTION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112081
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Alxa Desert Ecohydrol Expt Res Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Yu, Tengfei,Feng, Qi,Si, Jianhua,et al. Coordination of stomatal control and stem water storage on plant water use in desert riparian trees[J]. 中国科学院西北生态环境资源研究院,2019,33(3).
APA	Yu, Tengfei,Feng, Qi,Si, Jianhua,&Pinkard, Elizabeth A..(2019).Coordination of stomatal control and stem water storage on plant water use in desert riparian trees.TREES-STRUCTURE AND FUNCTION,33(3).
MLA	Yu, Tengfei,et al."Coordination of stomatal control and stem water storage on plant water use in desert riparian trees".TREES-STRUCTURE AND FUNCTION 33.3(2019).