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Company: Campbell Scientific

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Miniature External Sapflow Gauges and the Heat Ratio Method for Quantifying Plant Water Loss

Author:

Robert Paul Skelton,

Date:

2017-02-05

[Abstract] External sapflow sensors are a useful tool in plant ecology and physiology for monitoring water movement within small stems or other small plant organs. These gauges make use of heat as a tracer of water movement through the stem and can be applied in both a laboratory and a field setting to generate data of relatively high temporal resolution. Typical outputs of these data include monitoring plant water use on a diurnal time scale or over a season (e.g., in response to increasing water deficit during drought) to gain insight into plant physiological strategies. This protocol describes how to construct the gauges, how best to install them and some expected data outputs. [摘要] 外部液流传感器是植物生态学和生理学中有用的工具，用于监测小茎或其他小植物器官内的水分运动。这些量规利用热作为通过杆的水运动的示踪剂，并且可以在实验室和场设置中应用，以产生相对高的时间分辨率的数据。这些数据的典型输出包括在日间时间尺度或季节（例如，响应干旱期间增加的水分亏缺）监测植物用水量，以了解植物生理策略。该协议描述了如何构建仪表，如何最好地安装它们以及一些预期的数据输出。

背景 Sapflow技术是植物生态学中的一种工具，它利用热作为茎或其他植物器官内水流的代表。虽然已经开发了各种液流方法（参见McElrone和Bleby，2011）的综述，外部微型液流流量计利用热比法（HRM）（Burgess et al。，2001），估计植物汁液速度。
＆nbsp;人力资源管理系统依赖于两个热电偶，其均匀地沿着与液体流相同的轴线分开加热元件的两侧（Burgess et al。，2001）。（注意：一般来说，水通过植物从根部向叶子移动，在蒸发蒸腾期间它通过气孔渗透而消失[E]。）马歇尔（1958）显示，对于低流速，下游温差T 1> 1 到上游温差T 2提供了热脉冲速度的精确估计，：
＆nbsp; ＆nbsp;＆nbsp; ＆nbsp;＆nbsp; ＆nbsp;＆nbsp; ＆lt; em＆gt;＆lt; ...

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