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首页> 外文期刊>Acta Horticulturae >Continuous in situ measurements of crop water stress in 'Shiraz' grapevines using a thermal diffusivity sensor
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Continuous in situ measurements of crop water stress in 'Shiraz' grapevines using a thermal diffusivity sensor

机译：使用热漫射传感器在“Shiraz”葡萄树中的作物水分应激的持续测量

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摘要

A new measure of crop water deficit stress (CWS) using a thermal diffusivity sensor was evaluated under field conditions in southern Australia in early 2014 in mature 'Shiraz' grapevines over a two-month period. The trial tracked the correlation between thermal diffusivity (TD) of xylem (sap and tissue) and vapour pressure deficit (VPD) as a measure of CWS. In-canopy VPD measurements were used as a surrogate for atmospheric demand. Matric potential sensors in the soil profile below the vine were usedas an independent measure of potential water deficit stress. The TD vs. VPD correlation coefficient was derived from 96 quarter-hourly readings over each day, starting at 06:00 h daily when the vine was expected to have reached hydraulic equilibrium with the soil. Correlation coefficients were around 0.9 under well-irrigated conditions but dropped to around 0.6 before each irrigation was applied. As the soil profile dried over the course of the season and tissue rehydration increasingly failed to recover after high-stress summer days where sap flow was low, TD did not correlate as well with VPD. The sensor output closely tracked irrigation cycles.
机译：在2014年初的澳大利亚南部的现场条件下，在一个两个月的时间内，在澳大利亚南部的现场条件下评估了使用热扩散性传感器的新措施的新措施。该试验跟踪了木质（SAP和组织）的热扩散率（TD）与蒸气压缺陷（VPD）的相关性作为CWS的量度。冠层内部VPD测量用作大气需求的替代品。在葡萄树下的土壤轮廓中的Matric电位传感器使用了独立的潜在水缺陷应力的衡量标准。 TD与VPD相关系数来自每天96个四分之一小时读数，每天开始于06:00 H日期，当时预计藤蔓达到土壤液压平衡。在灌溉良好的条件下，相关系数约为0.9，但在施加每次灌溉之前跌至约0.6。由于土壤型材在季节的过程中干燥，并且在SAP流量低的高应力夏季后越来越多地恢复组织再水水，TD与VPD也不相关。传感器输出紧密跟踪灌溉周期。

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