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本文应用压力室和PV技术研究了大兴安岭地区主要针叶树种兴安落叶松和樟子松的四种苗木类型和两株幼树的水势和膨压的日变化及季节变化.结果表明:在典型的天气条件下,苗木和幼树的水势日变化量呈明显的单峰曲线.水势、膨压以及蒸腾的日变化与气温,光照和空气相对湿度的日变化基本吻合.水势的季节变化表明,在整个生长季,由于落叶松蒸腾耗水量大,表现出水分亏缺的特点.
In this paper, four types of seedlings of Larix gmelinii and Pinus sylvestris var. Mongolica and their diurnal and seasonal variations in water potential and turgor pressure of two saplings in the Greater Hinggan Mountains were studied using pressure chamber and PV technique. The results showed that in typical weather , The diurnal variation of water potential of seedlings and saplings showed a significant single peak curve.The diurnal variation of water potential, turgor pressure and transpiration were in good agreement with the diurnal changes of relative humidity of air temperature, light and air.The seasonal variation of water potential showed that the diurnal variation of water potential Growing season, due to large water consumption transpiration of larch, showing the characteristics of water deficit.