Improving sap flux density measurements by correctly determining thermal diffusivity, differentiating between bound and unbound water

被引:53
作者
Vandegehuchte, Maurits W. [1 ]
Steppe, Kathy [1 ]
机构
[1] Univ Ghent, Plant Ecol Lab, Fac Biosci Engn, B-9000 Ghent, Belgium
关键词
heat dissipation; sap flow; thermal capacity; thermal conductivity; thermal diffusivity; HEAT PULSE METHOD; HYDRAULIC REDISTRIBUTION; SOIL-WATER; EUCALYPTUS-REGNANS; FLOW; TRANSPIRATION; MODEL; STEM; CONDUCTIVITY; WOODLAND;
D O I
10.1093/treephys/tps034
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Several heat-based sap flow methods, such as the heat field deformation method and the heat ratio method, include the thermal diffusivity D of the sapwood as a crucial parameter. Despite its importance, little attention has been paid to determine D in a plant physiological context. Therefore, D is mostly set as a constant, calculated during zero flow conditions or from a method of mixtures, taking into account wood density and moisture content. In this latter method, however, the meaning of the moisture content is misinterpreted, making it theoretically incorrect for D calculations in sapwood. A correction to this method, which includes the correct application of the moisture content, is proposed. This correction was tested for European and American beech and Eucalyptus caliginosa Blakely & McKie. Depending on the dry wood density and moisture content, the original approach over- or underestimates D and, hence, sap flux density by 10% and more.
引用
收藏
页码:930 / 942
页数:13
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