气候变化领域集成服务门户(CCPortal): Diurnal and nocturnal transpiration behaviors and their responses to groundwater-table fluctuations and meteorological factors of Populus tomentosa in the North China Plain

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DOI	10.1016/j.foreco.2019.06.009
	Diurnal and nocturnal transpiration behaviors and their responses to groundwater-table fluctuations and meteorological factors of Populus tomentosa in the North China Plain
	Di N.; Xi B.; Clothier B.; Wang Y.; Li G.; Jia L.
发表日期	2019
ISSN	0378-1127
起始页码	445
结束页码	456
卷号	448
英文摘要	For theories of forest water utilization over day-night cycles, it is important to have a reliable information on plant transpiration behaviors during daytime and nighttime and their environmental controls. With the help of thermal dissipation probes, our study investigated the seasonal variations in the diurnal (Qday) and nocturnal stand water use (Qnight) of a Populus tomentosa plantation and explored their responses to groundwater table (GT) fluctuations and the meteorological factors. The results indicated that Qnight occurred on most nights during the growing season in the P. tomentosa plantation, but with a different seasonal dynamic from Qday. A distinct increase in the ratio of nocturnal to daily water use appeared at the beginning and the end of the growing season. During the experimental period, stem refilling accounted for 61% of Qnight, indicating that P. tomentosa was able to draw on stored water in the stem to support transpiration. The Qday and Qnight were positively and negatively related to GT, respectively. When the GT varied within 170 cm of the surface, the proportion of stem refilling accounting for Qnight increased with GT. The positive and negative correlations were found in meteorological factors with Qday and Qnight, respectively. Among the single meteorological factors except for ET0, vapor pressure deficit (VPD) and photosynthetically active radiation (PAR) explained the highest variation in Qday in 2010 and 2011, respectively. In contrast, Qnight was dominantly affected by VPD in 2011. Nocturnal stand water-use could help P. tomentosa to recharge the consumption of water stored in the stem and overcome the seasonal drought. The compensation effect of groundwater on the nocturnal stand water-use of P. tomentosa could reduce its consumption of water stored in the stem. As the stand age of P. tomentosa plantation varied, the key meteorological drivers of both Qday and Qnight also changed. Our results enable better understanding of the water-use strategies of poplars in the North China Plain and can lead to refinement of current silvicultural techniques. © 2019 Elsevier B.V.
英文关键词	Groundwater fluctuation; Nocturnal water use; Poplar; Sap flow; Stem refilling
语种	英语
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155859
作者单位	Ministry of Education Key Laboratory of Silviculture and Conservation, Beijing Forestry University, Beijing, China; Plant & Food Research, Fitzherbert Science Centre, Palmerston North, New Zealand; Beijing Academy of Forestry and Pomology, Institute of Agriculture and Forestry Sciences, Beijing, China; The Faculty of Agroforestry and Medicine, The Open University of China, Beijing, China
推荐引用方式 GB/T 7714	Di N.,Xi B.,Clothier B.,et al. Diurnal and nocturnal transpiration behaviors and their responses to groundwater-table fluctuations and meteorological factors of Populus tomentosa in the North China Plain[J],2019,448.
APA	Di N.,Xi B.,Clothier B.,Wang Y.,Li G.,&Jia L..(2019).Diurnal and nocturnal transpiration behaviors and their responses to groundwater-table fluctuations and meteorological factors of Populus tomentosa in the North China Plain.Forest Ecology and Management,448.
MLA	Di N.,et al."Diurnal and nocturnal transpiration behaviors and their responses to groundwater-table fluctuations and meteorological factors of Populus tomentosa in the North China Plain".Forest Ecology and Management 448(2019).