在不同的土壤水分条件下对冬小麦叶片水分生理因子进行了连续的测定,结果表明水分胁迫使作物光合、蒸腾的日变化进程提前,上午胁迫处理作物气孔导度大于非胁迫处理作物的气孔导度,这有助于胁迫处理的作物利用有限的土壤水分;蒸腾速率比光合速率对水分胁迫的反应更为敏感 更易受气孔调节的影响。在不同的生育期,作物气孔阻力与0~40cm 土层的土壤含水量相关性最大,可用二次曲线来拟合0~40cm 土层土壤含水量在0.25m3m–3左右时,气孔开度最大,此时气孔阻力为最小。
Under different soil–water conditions,the leaf water physiological factors of winter wheat have been measured continually.The results show that diurnal patterns of photosynthesis rate and transpiration rate have been advanced under soil–water stress condition,and stomatal conductance under the stress condition is bigger than that under the no water stress conditions in the morning therefore,the crop can make use of the limited soil–water under the stress condition.The transpiration rate can be controlled more readily than the photosynthesis rate by the stomata under the soil–water stress comdition.And under the different soil water con ditions on different crop growth stages,the stomatal resistance is the most relative to soil moisture of the soil lays from zero centimeter to40centimeter,and the relative curve can be simulated by the hyperbola.When the soil moisture from zero centimeters to40cemtimeters is approximately equal to0.25m3m–3,the stomatal resistance will reach to the least because of the maximum stomatal open deagee.
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