气候变化领域集成服务门户(CCPortal): Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations

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DOI	10.5194/hess-24-2755-2020
	Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations
	Larsen E.K.; Palau J.L.; Valiente J.A.; Chirino E.; Bellot J.
发表日期	2020
ISSN	1027-5606
起始页码	2755
结束页码	2767
卷号	24 期号:5
英文摘要	Transpiration is a crucial component in the hydrological cycle and a key parameter in many disciplines like agriculture, forestry, ecology and hydrology. Sap flow measurements are one of the most widely used approaches to estimate whole-plant transpiration in woody species; this is due to their applicability in different environments and in a variety of species as well as the fact that continuous high temporal resolution measurements of this parameter are possible. Several techniques have been developed and tested under different climatic conditions and using different wood properties. However, the scientific literature also identifies considerable sources of error when using sap flow measurements that need to be accounted for, including probe misalignment, wounding, thermal diffusivity and stem water content. This study aims to explore probe misalignment as a function of time in order to improve measurements during longterm field campaigns ( > 3 months). The heat ratio method (HRM) was chosen because it can assess low and reverse flows. Sensors were installed in four Pinus halepensis trees for 20 months. The pines were located in a coastal valley in south-eastern Spain (39?5704500 N 1?803100 W) that is characterised by a Mediterranean climate. We conclude that even small geometrical misalignments in the probe placement can create a significant error in sap flow estimations. Additionally, we propose that new statistical information should be recorded during the measurement period which can subsequently be used as a quality control of the sensor output. The relative standard deviation and slope against time of the averaged vv12 were used as quality indicators. We conclude that no general time limit can be set regarding the longevity of the sensors, and this threshold should rather be determined from individual performance over time. © 2020 Author(s).
语种	英语
scopus关键词	Agricultural robots; Alignment; Flow measurement; Forestry; Probes; Transpiration; Geometrical misalignment; High temporal resolution measurement; Individual performance; Mediterranean climates; Relative standard deviations; Sap flow measurements; Scientific literature; Statistical information; Quality control; coniferous tree; diffusivity; heating; hydrological cycle; quality control; sap flow; science and technology; sensor; soil temperature; transpiration; water content; Spain; Pinus halepensis
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159392
作者单位	Larsen, E.K., Mediterranean Centre for Environmental Studies (Fundación CEAM), Charles R. Darwin 14, Parque Tecnològico Paterna, Valencia, 46980, Spain, Department of Ecology, University of Alicante, Apdo. 99, Alicante, 03080, Spain; Palau, J.L., Mediterranean Centre for Environmental Studies (Fundación CEAM), Charles R. Darwin 14, Parque Tecnològico Paterna, Valencia, 46980, Spain; Valiente, J.A., Mediterranean Centre for Environmental Studies (Fundación CEAM), Charles R. Darwin 14, Parque Tecnològico Paterna, Valencia, 46980, Spain; Chirino, E., Faculty of Agricultural Sciences, Lay University Eloy Alfaro of Manabí, Ave. Circunvalación, Vía San Mateo, Manta, 130802, Ecuador; Bellot, J., Department of Ecology, University of Alicante, Apdo. 99, Alicante, 03080, Spain, IMEM Ramón Margalef, Department of Ecology, Faculty of Sciences, University of Alicante, Alicante, 03080, Spain
推荐引用方式 GB/T 7714	Larsen E.K.,Palau J.L.,Valiente J.A.,et al. Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations[J],2020,24(5).
APA	Larsen E.K.,Palau J.L.,Valiente J.A.,Chirino E.,&Bellot J..(2020).Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations.Hydrology and Earth System Sciences,24(5).
MLA	Larsen E.K.,et al."Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations".Hydrology and Earth System Sciences 24.5(2020).