基于热消散探针法的植物水分运输的研究进展

Research Overview of Plant Water Transportation Based on Thermal Dissipation Probe Method

摘要:

液流是分析树木耗水特性、研究树木水分传输机制的重要途径之一，热消散探针法已广泛用于树干液流变化的监测。热消散探针法是目前研究不同时空尺度上植物蒸腾耗水特性较为灵活、可靠、经济的一种方法。但由于物种特性的差异，可能造成试验过程中出现测量值与实际值相比偏低的状况。此外，相当一部分植物依赖树干储存水进行蒸腾，因此木材含水量的波动很可能会导致蒸腾作用测定的误差。对热消散探针法的工作原理、优势和局限以及使用时需要注意的问题进行了综述，并回顾了基于热消散探针法开展的植物水分运输研究以及针对该方法进行的校正与改进方面的相关成果。

Abstract:

Sap flow is one of the important ways to analyze the water consumption characteristics of trees and study the moisture transfer mechanism of trees. The heat dissipation probe method was widely used to monitor the change of sap flow. In general, the heat dissipation probe method is a flexible, reliable and economical method to study the water transpiration characteristics of plants on different spatial and temporal scales at present. However, due to differences in species characteristics, the measured value may be lower than the actual value during the experiment. In addition, a considerable number of plants depend on the water stored in the trunk for transpiration, so fluctuations in the moisture content of wood are likely to cause errors in the determination of transpiration. The principle, advantages and limitations of heat dissipation probe method were reviewed, as well as some problems. The researches on plant moisture transport based on the heat dissipation probe method and the method for correcting and improving the related results were retrospected.