文献类型：期刊文献

英文题名：Calibration of Thermal Dissipation Probes for Xylem Sap Flow in the Wood of a Diffuse-Porous and a Conifer Species under Cyclic Heating

作者：Hu, Meijun[1,2] Ma, Changming[3] Zhang, Jinsong[1,2] Ma, Yujie[3] Li, Chunyou[4] Xiong, Wei[5]

第一作者：Hu, Meijun

通信作者：Zhang, JS[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Natl Forestry & Grassland Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Nanjing Forest Univ, Collaborat Innovat Ctr Sustainable Forestry Southe, Nanjing 210037, Peoples R China;[3]Hebei Agr Univ, Coll Forestry, Baoding 071000, Peoples R China;[4]Hebei Agr Univ, Baoding 071000, Peoples R China;[5]Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China

年份：2022

卷号：13

期号：11

外文期刊名：FORESTS

收录：;EI(收录号：20230913640890);Scopus(收录号：2-s2.0-85148698084);WOS:【SCI-EXPANDED(收录号:WOS:000895239800001)】；

基金：This research was supported by the National Key Research and Development Project (grant no. 2020YFA0608101, 2016YFC0500101).

语种：英文

外文关键词：natural temperature gradient; equation calibration; Salix matsudana Koidz; Pinus bungeana Zucc

摘要：The most popular sap flow measurement technique uses thermal dissipation probes. Differences in wood characteristics and the natural temperature gradient between probes have affected the accuracy and applicability of the sap flow equation. In addition, the continued heat of the probe can also cause thermal damage to tree tissue. The objectives of this study were to use cyclic heating and calibrate the probes with two species: Pinus bungeana Zucc. And Salix matsudana Koidz., two typical diffuse-porous species. This experiment evaluated a thermal dissipation probe in three heating modes: continuous heating, 10 min heating and 50 min cooling (10/50), and 30 min heating and 30 min cooling (30/30). The heating modes were evaluated on two species. Temperature differences between the heating needle and the control needle under different heating modes and transpiration water consumption (whole-tree weighing method) were observed simultaneously. The sap flow estimation equation under cyclic heating mode was established by analyzing the relationship between the sap flow rate and the values obtained from whole-tree weighing. The results showed that the original equation underestimated sap flow rate of P. bungeana and S. matsudana by 67% and 60%. Under the cyclic heating modes, the modified equations were different from the original equation, and their accuracy was improved. After verification, the corrected equations [Fd = 0.0264K(0.738) (P. bungeana, 30/30, R-2 = 0.67), Fd = 0.0722K(1.113)(S. matsudana, 30/30, R-2 = 0.60), Fd is the sap flow density, K is temperature coefficient] reduced the influence of the natural temperature gradient on the estimation of sap flow rate, thereby significantly improving the accuracy of sap flow rate estimation. The resulting equation may be more suitable for actual field observations of sap flow in the two tested species. The cyclic heating mode has the potential to measure plant transpiration for extended periods in the field.