An improved single probe method for sap flow measurements using finite heating duration
An improved single probe method for sap flow measurements using finite heating duration
复制标题
使用有限加热持续时间测量液流的改进单探针方法
DOI：
10.1016/j.agrformet.2019.107788
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发表时间：
2020-01
影响因子：
6.2
通讯作者：
Steppe Kathy
中科院分区：
文献类型：
--
作者：
Ren Ruiqi;von der Crone Jonas;Horton Robert;Liu Gang;Steppe Kathy
由于单探针法成本低、制作简单，因此很容易提倡将单探针法作为树液流动研究的首选方法。采用改进的有限加热时间单探针法(F-SPHP)，在切开的茎段和田间以成熟山毛榉(Fagus sylvaticaL.)树木。F-SPHP方法基于热传导和对流耦合偏微分方程组的解析解，对导热系数(K)具有较大的相对敏感性。在切段试验中，F-SPHP方法能够测量2~36cm3 cm−2 h−1(热脉冲速度VH：3~60 cm·h−1)范围内的液流密度。与瞬时单探头热脉冲(I-SPHP)方法相比，这是一种改进，后者不能准确测量低(VH<；约20 cm/h−1)树液流量。Sapflow+(一种四针热脉冲法)用于野外验证，与重力测量相比，F-SPHP和Sapflow+的斜率分别为0.853和0.730。用F-SPHP和Sapflow+在森林中成熟的山毛榉上测得的模式在所有测量位置上都是相似的，当自然温度梯度很陡时，两种方法都需要进行温度校正。与多探针法相比，有限加热时间的单探针法具有对传导组织损伤小的优点。
Because of its low cost and simple fabrication, it is easy to advocate for the single probe method as a method of choice in sap flow studies. An improved single probe method with finite heating duration (F-SPHP) is verified both in cut stem segments and in the field using mature beech (Fagus sylvaticaL.) trees. The F-SPHP method is based on an analytical solution of the partial differential equation for combined heat conduction and convection, which shows large relative sensitivity to thermal conductivity (K). The F-SPHP method is able to measure sap flux densities (SFD) between 2 and 36 cm3cm−2h−1(heat pulse velocity (Vh): 3–60 cm h−1) in the cut stem segment experiment. This is an improvement compared to the instantaneous single probe heat pulse (I-SPHP) method which cannot accurately measure low (Vh< 20 cm h−1) sap flow. Sapflow+ (a four-needle heat pulse method) is used for field validation, and when compared with gravimetric measurements, slopes of 0.853 and 0.730 are obtained for F-SPHP and Sapflow+, respectively. Patterns measured with F-SPHP and Sapflow+ in mature beech trees in the forest are similar at all measurement positions and temperature correction is needed for both methods when natural temperature gradients are steep. Compared with multi-probe methods, the single probe method with finite heating duration has the advantage of causing less damage to conductive tissue.
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影响因子：
4
作者：
Nadezhdina
通讯作者：
Nadezhdina
影响因子：
2.1
作者：
Green, S;Clothier, B;Jardine, B
通讯作者：
Jardine, B
影响因子：
4
作者：
F. Do;S. I. N. Ayutthaya;A. Rocheteau
通讯作者：
F. Do;S. I. N. Ayutthaya;A. Rocheteau
影响因子：
2.8
作者：
Knight, John H.;Kluitenberg, Gerard J.;Hopmans, Jan W.
通讯作者：
Hopmans, Jan W.
DOI：
10.1051/forest:19850204
发表时间：
1985-01-01
期刊：
ANNALES DES SCIENCES FORESTIERES
影响因子：
--
作者：
GRANIER, A
通讯作者：
GRANIER, A