ISWC OpenIR  > 水保所2018--届毕业生论文
Correction of anisotropy effects on penta-needle heat-pulse probe sap-flux density and thermal property measurements
Wang,Sheng1,2,3; Fan, Jun1,2; Jones, Scott B.4
2018
Source PublicationAgricultural and Forest Meteorology
Volume263Issue:1Pages:399-408
Abstract

Growing interest in methods for estimating plant stem/trunk sap-flux density and thermal properties include the use of heated needles inserted into the plant. A penta-needle heat-pulse probe (PHPP) coupled with an on-chip integrated INV-WATFLX algorithm was newly developed for inverse estimation of isotropic porous media thermal-diffusivity, κ, -conductivity, λ, and heat velocity, Vh (converted to water-flux density, J), thus heat capacity, C(=λ/κ), and water content could also be derived. This integrated sensor, however, has yet to be applied in anisotropic sapwood sensing. Here, we conducted a numerical simulation of the PHPP heat pulse and a deviation analysis when using an INV-WATFLX code developed by Yang and Jones [Comput. Geosci.—UK. 35 (2009) 2250] in anisotropic porous media. Deviations in J were up to +40% and as low as -30%, and within 12% in κ, λ and C at static conditions for varied PHPP installation angles, α, in sapwood. We developed a correction of anisotropy effects, and followed up with a field test of the sensors installed on standing poplar (Populus simonii Carr.) trees using α = 0°, 15° and 30°. Field tests showed the corrected J estimated using PHPPs at α = 15° and 30° both agreed well with J from thermal dissipation probes (TDPs) in 1:1 line (R2 = 0.87 and 0.83, P < 0.01). The corrected J at α = 0° showed an apparent 30% underestimate (R2 = 0.87, P < 0.01), which was assumed to be due to wound effects. All PHPP estimates exhibited similar and stable κ, λ and C at night, but showed a diurnal fluctuation in J to varying extents likely due to the flow turbulence by inserted needles.

KeywordSap Flow Thermal Properties Wood Water Content Inv-watflx Heat Pulse Phpp Anisotropy
MOST Discipline Catalogue农学::农业资源与环境 ; 农学::林学
DOI10.1016/j.agrformet.2018.09.009
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Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8770
Collection水保所2018--届毕业生论文
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, No.3 Taicheng Road, Yangling 712100, Shaanxi, China
2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, No. 26 Xinong Road, Yangling 712100, Shaanxi, China
3.University of Chinese Academy of Sciences, No. 19 (A) Yuquan Road, Shijingshan District, Beijing 100049, China
4.Department of Plants, Soils and Climate, Utah State University, Logan, UT 84322, USA
Recommended Citation
GB/T 7714
Wang,Sheng,Fan, Jun,Jones, Scott B.. Correction of anisotropy effects on penta-needle heat-pulse probe sap-flux density and thermal property measurements[J]. Agricultural and Forest Meteorology,2018,263(1):399-408.
APA Wang,Sheng,Fan, Jun,&Jones, Scott B..(2018).Correction of anisotropy effects on penta-needle heat-pulse probe sap-flux density and thermal property measurements.Agricultural and Forest Meteorology,263(1),399-408.
MLA Wang,Sheng,et al."Correction of anisotropy effects on penta-needle heat-pulse probe sap-flux density and thermal property measurements".Agricultural and Forest Meteorology 263.1(2018):399-408.
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