论文部分内容阅读
我国自1980年以来由国家与地方合资,在19个省(区)、115个县和107个国营林场中进行了速生丰产林营造试点工作,在上述地区投资4,124万元,营造了杉、杨、桉、松类、竹子为主的速生丰产林67万多亩,预计1985年底可达100万亩。据一些试点实测结果,幼林速生效果良好。如广东省海南岛的临高县4,000亩3年生的桉树,平均树高7.2m,平均胸径6.2cm,每亩蓄积3.4m~3;湖北省阳新县2年生的意大利杨丰产林,平均树高9.5m,平均胸径9.1cm;江西省景德镇市枫树山林场,大面积的湿地松丰产林3年生平均树高2.8m,平均地径7.7c m;湖南省会同县国营金洞林场750亩7年生的杉木丰产林,平均树高8.1m,平均胸径10.4cm,平均每亩蓄积6.6m~3……。大量速生丰产林试点材料表明:“这是我国造林史上的一个重要转折,是我国营林事业由粗放经营开始走向集约经营的重要标志和重大改革”。(摘自刘广运副部长在大会上的总结
Since 1980, China has carried out pilot projects in fast-growing and high-yield forests in 19 provinces (districts), 115 counties and 107 state-owned forest farms, with a total investment of 41.24 million yuan in these areas. , Eucalyptus, pine, bamboo-based fast-growing high yield forest 670000 mus, is expected by the end of 1985 up to 1000000 mus. According to the results of some pilot tests, the fast-growing young forest produces good results. For example, 4,000 mu of 3-year-old eucalyptus trees in Lingao County of Hainan Island in Guangdong Province have an average height of 7.2 m and an average diameter at breast height of 6.2 cm with an area of 3.4 m ~ 3 mu per mu. The average annual tree height of 2-year-old Yangfeng forest in Yangxin County, Hubei Province, 9.5m and an average diameter at breast height of 9.1cm. The 3-year average height of the 3-year-old high-yield Pinus elliottii plantation in Jingdezhen, Jiangxi Province is 2.8m, with an average diameter of 7.7cm. Of fir high yield forest, the average height of 8.1m, average diameter of 10.4cm, the average accumulation of 6.6m ~ 3 per acre. The pilot projects of a large number of fast-growing and high-yield forests show that: “This is an important turning point in the history of afforestation in our country and an important symbol and a major reform that the forest management business in our country has started to go into intensive operations from extensive management.” (From the summary of Vice Minister Liu Guangyun at the meeting