ISWC OpenIR  > 水保所2018--2019届毕业生论文
New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems
Wang,Sheng1,2; Fan,Jun1,3; Ge, Jiamin3; Wang,Qiuming3; Yong, Chenxu3; You, Wei1,2
2018
Source PublicationForest Ecology and Management
Volume419-420Issue:1Pages:10-16
Abstract

Sap-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 sap-flux 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 (Vh) compared to gravimetric measurements of sap-flux density (Vs) under controlled conditions. A validation test was also carried out by comparing EHR method with the stem heat-balance (SHB) method through in situ and long-term monitoring of Vs on standing stems of C. korshinskiiVh in the tested cut stems of both species was linearly correlated with Vs up to approximately 50 cm h−1 (R2 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 Vh to Vs, however, varied between the two species, 2.02 and 1.15 for C. korshinskii and Spsammophila, respectively. The EHR technique sensitively captured the diurnal dynamics of Vs in field tests, within a range from zero to nearly 30 cm h−1 on C. korshinskii stems, and hourly Vs was linearly correlated with the reference evapotranspiration (R2 = 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
MOST Discipline Catalogue农学::农业资源与环境 ; 农学::林学
DOI10.1016/j.foreco.2018.03.020
URL查看原文
Indexed BySCI
Language英语
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8771
Collection水保所2018--2019届毕业生论文
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, No. 26 Xinong Road, Yangling, Shaanxi Province 712100, China
2.University of China Academy of Sciences, No. 19 (A) Yuquan Road, Shijingshan District, Beijing 100049, China
3.College of Natural Resources and Environment, Northwest A&F University, No. 3 Taicheng Road, Yangling, Shaanxi Province 712100, China
Recommended Citation
GB/T 7714
Wang,Sheng,Fan,Jun,Ge, Jiamin,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,2018,419-420(1):10-16.
APA Wang,Sheng,Fan,Jun,Ge, Jiamin,Wang,Qiuming,Yong, Chenxu,&You, Wei.(2018).New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems.Forest Ecology and Management,419-420(1),10-16.
MLA Wang,Sheng,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 419-420.1(2018):10-16.
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