A single-probe heat pulse method for estimating sap velocity in trees

被引:18
|
作者
Lopez-Bernal, Alvaro [1 ]
Testi, Luca [2 ]
Villalobos, Francisco J. [1 ,2 ]
机构
[1] Univ Cordoba, Dept Agr, Campus Rabanales,Edificio C4, Cordoba 14071, Spain
[2] CSIC, IAS, Av Menendez Pidal S-N, Cordoba 14080, Spain
关键词
convective velocity; sap flow; sensor; single probe; thermal diffusivity; water use; FLUX-DENSITY MEASUREMENTS; TRANSIENT REGIME IMPLEMENTATION; THERMAL DISSIPATION PROBES; FLOW MEASUREMENT; FIELD CONDITIONS; WATER; STEMS; IRRIGATION; SAPWOOD; ERRORS;
D O I
10.1111/nph.14694
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Available sap flow methods are still far from being simple, cheap and reliable enough to be used beyond very specific research purposes. This study presents and tests a new single-probe heat pulse (SPHP) method for monitoring sap velocity in trees using a single-probe sensor, rather than the multi-probe arrangements used up to now. Based on the fundamental conduction-convection principles of heat transport in sapwood, convective velocity (V-h) is estimated from the temperature increase in the heater after the application of a heat pulse (Delta T). The method was validated against measurements performed with the compensation heat pulse (CHP) technique in field trees of six different species. To do so, a dedicated three-probe sensor capable of simultaneously applying both methods was produced and used. Experimental measurements in the six species showed an excellent agreement between SPHP and CHP outputs for moderate to high flow rates, confirming the applicability of the method. In relation to other sap flow methods, SPHP presents several significant advantages: it requires low power inputs, it uses technically simpler and potentially cheaper instrumentation, the physical damage to the tree is minimal and artefacts caused by incorrect probe spacing and alignment are removed.
引用
收藏
页码:321 / 329
页数:9
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