不同水分条件下棉花茎流、叶温及茎粗变化规律

Change Rule of Sap Flow,Leaf Temperature and Stem Diameters of Cotton under Different Soil Water Contents

应用Phytalk植物生理生态监测系统和Globelog土壤水分温度监测系统,研究了江西省赣抚平原灌区棉花在不同水分条件下的茎流、叶温及茎粗变化规律。结果表明:棉花茎流呈明显的昼夜变化规律,晴天呈双峰曲线,多云天呈单峰曲线,阴天值较低且稳定,高的土壤含水率下峰值更高;棉花叶温变化与茎流类似,不过有滞后现象,叶温达到33℃左右时保持稳定;棉花茎粗与茎流和叶温变化规律相反,茎直径最大值出现在9点左右,最小值出现在18点左右,在中午12点左右会出现萎缩现象。

In this paper,Phytalk system and Globelog system are used to determine change the rule of sap flow and leaf temperature and stem diameter of cotton under different soil water contents. The results show that the diurnal variation of sap flow rate of cottonchanges day and night, multi-peaks for sunshine, single peak for broken sky, low and stable for cloudy sky, and higher in the higher soil water contents. The change of leaf temperature is similar to sap flow, but lag, stable when reaching 33 degrees Centigrade. Thechange of stem diameter is opposite to sap flow and leaf temperature, the maximum appears at about 9 and the minimum appears at about 18 and atrophy appears at about 12.