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本文详细研究了土壤干旱胁迫对兴安落叶松和樟子松苗木水势,膨压以及水分参数的影响,结果表明:土壤含水量与叶水势呈明显的双曲线关系[Y=x/(a+bx)],与膨压呈对数关系(y=a+blnx).樟子松属于典型的高水势延迟脱水耐旱树种,而落叶松则属于低水势忍耐脱水为其主要耐旱特征.由于樟子松和落叶松对土壤干旱胁迫的适应途径不同,从而体现在水分参数上的水分生理特点也不尽相同.综合所有的水分参数特点来看.樟子松耐旱能力高于落叶松.
In this paper, the effects of soil drought stress on the water potential, turgor pressure and water parameters of Larix gmelinii and Pinus sylvestris var. Mongolica were studied in detail. The results showed that there was a hyperbolic relationship between soil water content and leaf water potential [Y = x / (a + bx )], And the turgor was logarithmic (y = a + blnx) .Spine pine belongs to the typical high water potential delayed dehydration and drought-resistant species, while the larch belongs to the low water potential tolerance dehydration as its main drought-tolerant characteristics. The adaptive pathways of pine and larch to soil drought stress are different, and thus the water physiological characteristics reflected in the water parameters are not the same .According to the characteristics of all water parameters, the drought tolerance of Pinus sylvestris var. Mongolica is higher than that of larch.