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在我省东部干旱半干旱浅山地区,土壤含水率是树木生长的一个重要限制因子,为了研究其特点和变化规律,我们于1985、1986两年(86年只测到7月中旬)在大通县洪水沟选点进行土壤水分测定,现将测定结果报告如下: 测点概况测点设在大通县洪水沟沟口阳坡和阴坡的青杨人工林内(北纬36°51’,东经101°43’).据大通气象站资料,测点所在地区的年平均气温4.2℃,年平均降水量461毫米,年平均相对湿度60%,年平均蒸发量1500毫米,年平均日照时数2617小时,年平均风速2米/秒.阴坡最高海拔2650米,阳坡最高海拔2600米,相对高差240米左右.
In the arid and semi-arid shallow mountainous area in the eastern part of our province, the soil moisture content is an important limiting factor for the growth of trees. In order to study its characteristics and changing rules, we found that in Datong County The results of the measurements are reported as follows: Survey points The survey points are located in the Qingyang plantation (36 ° 51 ’north latitude and 101 ° 43 east longitude) on the sunny and shady slopes of the flood ditch in Datong County According to the statistics of the Chase Weather Station, the annual average temperature of the area where the measuring points are located is 4.2 ℃, the average annual rainfall is 461 mm, the annual average relative humidity is 60%, the annual average evaporation is 1500 mm, and the annual average sunshine duration is 2617 hours. The average wind speed is 2m / s, with the highest altitude of 2650m on the shady slope and the highest elevation of 2600m on the sunny slope, with a relative height difference of about 240m.