Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2018.03.020 |
New design of external heat-ratio method for measuring low and reverse rates of sap flow in thin stems | |
Wang, Sheng1,2,3; Fan, Jun1,2,4; Ge, Jiamin4; Wang, Qiuming4; Yong, Chenxu4; You, Wei1,2,3 | |
2018-07-01 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT
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ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2018 |
卷号 | 419页码:10-16 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
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. |
英文关键词 | Sap-flux density Heat-pulse method External heat-ratio (EHR) technique Small stems Gauge spacings |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000432498900002 |
WOS关键词 | PULSE METHOD ; SOIL-WATER ; REDISTRIBUTION ; CONDUCTANCE ; DYNAMICS ; TREES |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23523 |
专题 | 气候变化 |
作者单位 | 1.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 |
推荐引用方式 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,2018,419:10-16. |
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,419,10-16. |
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(2018):10-16. |
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