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New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems

文献类型：期刊论文

作者Wei You1,3; 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.; Sheng Wang1,3; Jun Fan1,3; Jiamin Ge2; Qiuming Wang2; Chenxu Yong2
刊名FOREST ECOLOGY AND MANAGEMENT
出版日期2018
卷号419页码:10-16
ISSN号0378-1127
关键词Sap-flux Density Heat-pulse Method External Heat-ratio (Ehr) Technique Small Stems Gauge Spacings
DOI10.1016/j.foreco.2018.03.020
文献子类Article
英文摘要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 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.
学科主题Forestry
出版地PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000432498900002
资助机构Projects of National Natural Science Foundation of China [NSFC 41571130082, 41571224] ; Projects of National Natural Science Foundation of China [NSFC 41571130082, 41571224] ; Projects of National Natural Science Foundation of China [NSFC 41571130082, 41571224] ; Projects of National Natural Science Foundation of China [NSFC 41571130082, 41571224]
源URL[http://ir.iswc.ac.cn/handle/361005/8226]  
专题水保所科研产出--SCI_2018--SCI
通讯作者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.
作者单位1.Minist Water Resources, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China
2.Northwest A&F Univ, Coll Nat Resources & Environm, 3 Taicheng Rd, Yangling 712100, Shaanxi, Peoples R China
3.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
4.Univ China Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wei You,Fan, J ,Fan, J ,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 Wei You.,Fan, J .,Fan, J .,Sheng Wang.,Jun Fan.,...&Chenxu Yong.(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 Wei You,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.

入库方式： OAI收割

来源：水土保持研究所

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