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纳溪县地处长江上游低山丘陵区,是全省速生丰产用材林基地.1980年后营造速生丰产用材林.以杉木为主要树种,培育目标为中小径材.经近10年的努力,已初具规模.目前全县已造基地林122,900亩,其中速生丰产用材林71,547亩,占58.2%,年平均进度1.78万亩.造林成活率,保存率都在90%以上,幼林年生长量一般平均高1米、径1厘米以上,普遍实现四、五年郁闭,六、七年开始抚育问伐,每亩平均有活立木蓄积1立方米左右.根据现有长势和产区区划调查资料分析,预计15—20年可以成林,亩产可达8—10立方米.现我们仅就技术措施方面,谈几点经验.
Naxi County is located in the upper reaches of the Yangtze River in the hilly region, is the province’s fast-growing high-yield timber base after 1980 to create fast-growing high-yield timber. Cunninghamia truncatula as the main species, cultivation goals for small and medium-sized timber. After nearly 10 years of hard work, At present, the county has made 122,900 mu of base forests, of which 71,547 mu are fast-growing and high-yield timber forests, accounting for 58.2% of the total, with an average annual progress of 17,800 mu. The afforestation survival rate and the preservation rate are both above 90% 1 meter and a diameter of 1 cm or more, the general realization of four or five years of canopy closure, six or seven years of tending and raising, an average of about 1 cubic meter of living stock per mu .According to the existing growth and production survey data analysis, It is estimated that forests will reach 15-20 years and the yield per mu will reach 8-10 cubic meters. Now we will talk about some technical measures and experience.