温度对压力-容积分析和对植物组织吸水影响的研究

以25年树龄的挪威云杉树冠中部生长1年的小枝为测试材料,应用电子控温压力室,分别在15、20、25、30和35℃的恒温条件下进行PV分析所得到的水分参数表明;温度升高将引起π₀和π_p值下降,ROWC_πp和RWC_πp却几乎不受温度的影响;在不控温条件下应用Hammel逐渐升压法进行PV分析时,压力室温度比室温高1-2℃,所得结果与同样温度控温所测结果相似。在5-30℃不同温度条件下的植物组织吸水试验表明,在一定限度内升高温度可以增强植物组织的吸水量。

Effect of temperature on pressure-volume analysis and water absorption of plant tissues.

One year old branches of 25 years old Norway spruce are taken from middle layer of canopy,and their water parameters are measured in a pressure chamber electrically controlled at 15,20,25,30 and 35℃. Pressure-volume analysis indicates that high temperature will induce the decrease of π₀ and π_p values, and different temperature has little effect in ROWC_πp and RWC_πp. Similar results are obtained using Hammel's method of gradually increasing pressure without temperature control. Tests of water absorption by plant tissues under 5-30℃ show that the water absorbing capacity increases with increasing temperature.