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New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems
Sheng Wang1,2; Jun Fan1,2; Jiamin Ge4; Qiuming Wang4; Chenxu Yong4; Wei You1,2; Fan, J (reprint author), Minist Water Resources, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.; Fan, J (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationFOREST ECOLOGY AND MANAGEMENT
ISSN0378-1127
description.correspondentemailfanjun@ms.iswc.ac.cn
Volume419Pages:10-16
AbstractSap-flow techniques had limited application to thin-stemmed woody and herbaceous species and to diverse functional plant organs until the recent development of the external heat-ratio (EHR) method. Existing EHR techniques using miniature gauge configurations, however, are limited to thin stems with diameters of 2-5 mm. This study introduces a new design of an EHR gauge adapted to thin stems with diameters up to 15 mm and sapflux densities < 50 cm h(-1). The gauge was calibrated on cut stems of the shrubs Caragana korshinskii and Salix psammophila, with the measured heat-pulse velocity (V-h) compared to gravimetric measurements of sap-flux density (V-s) under controlled conditions. A validation test was also carried out by comparing MR method with the stem heat-balance (SHB) method through in situ and long-term monitoring of V-s on standing stems of C. korshinskii. Vh in the tested cut stems of both species was linearly correlated with V, up to approximately 50 cm h(-1) (R-2 up to 0.96, P < 0.001) in a range of stem diameters of 4.1-15.6 mm. An empirical multiplier for converting the measured V-h to V-s, however, varied between the two species, 2.02 and 1.15 for C. korshinskii and S. pscunmophila, respectively. The EHR technique sensitively captured the diurnal dynamics of V-s in field tests, within a range from zero to nearly 30 cm h(-1) on C. korshinskii stems, and hourly V-s was linearly correlated with the reference evapotranspiration (R-2 = 0.70, P < 0.001) over 26 successive days without drought stress. The tested SHB method, however, poorly detected the sap-flux density, especially at low densities. The gauges for the EHR method were easy to build and capable of accurate estimating bidirectional sap flow, especially at low densities. This technique, with variable EHR gauge configurations, has broader applications than SHB methods for understanding plant-water relations in understories, shrubs and ecosystems dominated by herbage.
KeywordSap-flux Density Heat-pulse Method External Heat-ratio (Ehr) Technique Small Stems Gauge Spacings
Subject AreaForestry
DOI10.1016/j.foreco.2018.03.020
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000432498900002
PublisherELSEVIER SCIENCE BV
Funding OrganizationProjects of National Natural Science Foundation of China [NSFC 41571130082, 41571224] ; Projects of National Natural Science Foundation of China [NSFC 41571130082, 41571224]
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8226
Collection水保所科研产出--SCI_2018--SCI
Corresponding AuthorFan, J (reprint author), Minist Water Resources, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.; Fan, J (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
Affiliation1.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China
2.Minist Water Resources, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China
3.Univ China Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
4.Northwest A&F Univ, Coll Nat Resources & Environm, 3 Taicheng Rd, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Sheng Wang,Jun Fan,Jiamin Ge,et al. New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems[J]. FOREST ECOLOGY AND MANAGEMENT,2018,419:10-16.
APA Sheng Wang.,Jun Fan.,Jiamin Ge.,Qiuming Wang.,Chenxu Yong.,...&Fan, J .(2018).New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems.FOREST ECOLOGY AND MANAGEMENT,419,10-16.
MLA Sheng Wang,et al."New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems".FOREST ECOLOGY AND MANAGEMENT 419(2018):10-16.
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