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我场位于予西卢氏县(土井)内,(尸专)秦岭余脉,沟壑纵横、起伏连绵,海拔800——1600米,土圵深厚,高山为棕色森林土,低山为褐色土,坡度在15——40度之间,土圵 PH值为6——7.5,年平均降雨量为635毫米,7——8月份降雨量占全年降雨量的38%,冬春季节干旱多风,年平均气温12.6℃,1月份平均气温—1.6℃,7月份平均气温25.8℃,早霜于每年10月中旬开始,晚霜到翌年四月中旬,无霜期176天。油松是我场荒山造林的主要树种,从一九五六年开始已营造油松林6.5万亩,有4万余亩已经郁闭成林,占全场总造林保存面积的80%,年最大高生长量为98厘米,直径1厘米。现就如何提高造林成活率、影响油松生长的因素和抚育间苗问题谈一下我们的
My field is located in Xi Lushi County (Doi), (corpse) Qinling Mountains, gully vertical and horizontal, ups and downs, 800 - 1600 meters above sea level, soil 圵 deep, high mountain brown forest soil, low mountain brown soil, Gradient between 15 - 40 degrees, soil 圵 PH value of 6 - 7.5, the average annual rainfall of 635 mm, 7 - August rainfall accounted for 38% of annual rainfall, winter and spring arid windy , The average annual temperature of 12.6 ℃, the average January temperature - 1.6 ℃, July average temperature of 25.8 ℃, the early frost in mid-October each year, the night frost to mid-April the following year, frost-free period of 176 days. Pinus tabulaeformis is the main tree species afforestation in the barren hills in my field. Since 1956, 65,000 mu of Pinus tabulaeformis forest has been built and more than 40,000 mu have been closed, accounting for 80% of the total afforestation area, the largest High growth of 98 cm, 1 cm in diameter. Now on how to improve the survival rate of afforestation, the factors that affect the growth of Pinus thunbergii