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1982年春,我们在本所杨树丰产林内进行了灌水试验,现将初步试验结果整理如下,供参考。一、试验地概况雁北林科所在大同盆地怀仁城东北5华里处。年平均温度6℃,最高温度37.4℃,最低—27.3℃;年降水量400毫米左右,而70％集中在7、8、9三个月;年蒸发量1700—1900毫米;土壤为淡栗钙沙壤土,有钙积层,土壤有机质含量0.5％左右,PH值7.5;地被以白草为主。树种:群众杨,1979年秋栽植,株行距3×6米。栽后每年每亩施硝酸铵36斤,过磷酸钙70斤,中耕2次;栽后修枝1次。二、试验方法灌水试验设计三个水平。即:相隔
In the spring of 1982, we conducted irrigation experiments in our poplar forest, and the preliminary test results are summarized as follows for reference. First, the experimental profile Yanbei Linke Datong Datong Huai Ren City northeast 5 Wuli Department. The annual average temperature of 6 ℃, the maximum temperature of 37.4 ℃, the lowest -27.3 ℃; annual precipitation of about 400 mm, while 70% concentrated in the 7,8,9 three months; annual evaporation 1700-1900 mm; Sandy loam, calcium accumulation, soil organic matter content of about 0.5%, PH value of 7.5; to white grass dominated. Species: Poplar Young, planted in autumn 1979, spacing of 3 × 6 meters. Each year after planting transplanting 36 kg of ammonium nitrate, superphosphate 70 kg, cultivating 2 times; planting pruning 1 times. Second, the test method Irrigation experiment design three levels. That is: separated