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经多年试种,窿缘桉已成为澄迈县的主要造林树种之一;据反映,木材经水浸半年后,材性良好,被当地群众誉为“第二母生”,深受欢迎。它虽具有对土壤要求不严和粗生速生的特点,但种在土层浅薄贫瘠的沙壤土上的实生苗,则生长缓慢,且树干弯曲,尖削度大,经济价值不高。根据调查我场12年生的林分,平均树高8米,胸径10厘米,每亩出材量(包括薪材)仅4立方米,其中规格材(尾径8厘米,长3.8米)仅0.2立方米,成材率(指株数)为2％。为了提高成材率,增加出材量,以满足社会主义建设和人民生活的需要,我场从1970年开始,用皆伐萌芽更新来改造二千一百多亩窿缘桉林,取得了良好的效果。经改
After many years of trial planting, eucalyptus margin has become one of the main afforestation species in Chengmai County. According to reports, after six months of flooding, the timber was well-known and was praised by local people as the “second mother,” and was very popular. Although it has the characteristics of strict requirements on the soil and rapid growth, the seedlings planted on sandy loam soil with shallow and infertile soil grow slowly and have benign trunks and sharp taper with low economic value. According to the survey of 12-year-old stands in my field, the average tree height is 8 meters and the diameter at breast height is 10 centimeters. Only 4 cubic meters of output (including fuelwood) per mu is provided, of which the specification timber (8 cm in tail diameter and 3.8 meters in length) Cubic meter, finished product rate (refers to the number of) 2%. In order to improve the yield rate and increase the output to meet the needs of socialist construction and people’s livelihood, we began to rebuild more than 2,100 mu worth of margin eucalyptus forests with germination and regeneration of Clear-cuttings starting from 1970 and achieved good effect. After the change