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林分的合理经营密度是科学营林的重要问题.为了探讨赤松林的合理经营密度,我们于1973年春,在涛雒公社华山大队选择十三年生赤松林设置固定标准地5块,通过扶育间伐不断地调整林分的密度,改善林分的生长条件,提高林分的生产力,有效地促进了赤松速生丰产。现将试验测定结果初步总结如下.一、试验地的自然概况试验地气候条件,属北温带海洋性气候类型.据日照气象站(石臼所)的气候总结资料,主要气象要素为:年平均温度12.5℃,绝对最高温度37.5℃,绝对最低温度-14.5℃,年降雨量955毫米,年平均相对湿度71％,年平均风速3.5
In order to explore the reasonable management density of Pinus densiflora in the spring of 1973, we set up 5 fixed standard plots in the 13-year-old Pinus taeda forest in Taoshan commune Huashan brigade, Continuously adjust the density of the stands, improve the growth conditions of the stands, improve the productivity of the stand, and effectively promote the fast-growing and high-yielding of the plantation. The results of the experiment are summarized as follows: First, the natural conditions of the experimental site The climatic conditions are of the northern temperate maritime climate type According to the climate summary data of the Rizhao Weather Station (Shijiu Suo), the main meteorological elements are: annual average temperature 12.5 ℃, the absolute maximum temperature of 37.5 ℃, the absolute minimum temperature of -14.5 ℃, the annual rainfall of 955 mm, the annual average relative humidity of 71%, the average annual wind speed of 3.5