不同土壤水分条件下山杏的蒸腾特性与影响因子

 为了解干旱地区影响山杏苗木蒸腾特性的因素,在人工控制土壤水分的条件下,利用Li-1600稳定气孔仪等仪器,对生长在不同土壤含水量条件下的山杏苗木进行蒸腾特性及其大气环境因子测定。结果表明:在不同水分条件下,山杏蒸腾速率及气孔阻力的日变化曲线呈“双峰型”;蒸腾速率与土壤含水量的关系呈三次线性相关,8、9月份,山杏叶片蒸腾速率达到最大值时所对应的土壤含水量分别为18.01%、16.86%;在试验的4个土壤水分梯度中,蒸腾速率与大气环境因子的相关性随土壤水分的增大而增大;在土壤水分严重胁迫的条件下,8月光合有效辐射对蒸腾作用影响较大,9月气温对蒸腾作用影响较大;在土壤水分充足的条件下,8月空气相对湿度对蒸腾作用影响较大,9月太阳有效辐射对蒸腾作用影响较大。

Relationship between transpiration character of Prunus armeniaca and environmental factors under different soil moisture

In order to master the factors having impact on the transpiration of Prunus armeniaca in arid area.In the controlling of controlling soil moisture,using portable steady porometer（Li-1600） and so on,transpiration rate（Tr） of Prunus armeniaca and atmosphere environmental factors were conducted under the condition of typical sunny day.The results show that the daily changes of transpiration rate（Tr） and stomatal resistance（Gs） of Prunus armeniaca appeared as double-peak curve and "W" curve in different soil moisture.And the response curves of transpiration rate to soil water content（θ） answer for cubic,the soil water content of the highest transpiration rate（Tr） is 18.01%、16.86% respectively in August and September.The relationship between transpiration rate（Tr） and atmosphere environmental factors increased as these four levels of soil（water） content（θ） climbing.When soil water is scarcity,solar effective radiation is the mainly factor to affect transpiration rate（Tr） in August,and so is air temperature in September.When soil water is sufficient,relative humidity is the mainly factor to affect transpiration rate in August,air temperature in September.