论文部分内容阅读
森林苗木是造林的物质基础。选择良种、培育壮苗是保证林木速生丰产的关键。兆坑林场目前杉木种子园的球果较一般出子率高0.6—1%,种子园的种子育苗较一般苗高2.8公分。各地资料也有介绍,经种源选择的种子育苗造林可提高木材产量30—50%,未经鉴定的优树种子育苗造林可提高木材产量10%,经鉴定的可提高20—30%。所谓良种,就是性状符合特定要求的优良种子。因树种不同,栽培目的不同,要求不一。杉、松、樟等用材林,有用材林的标准要求。油茶、油桐等经济林,有经济林的要求。同是国外松、马尾松,因采脂或用材等经营目的不同,要求的标准也不相同。但一般的说有
Forest seedlings are the material basis for afforestation. Select the seed, nurturing strong seedling is to ensure fast-growing yield key. At present, the coniferous seed orchard in Zhaokeng Forest Farm is 0.6-1% higher than the normal one. The seedling in the seed orchard is 2.8cm higher than the normal one. Information has also been introduced around the seed selection by seedling afforestation can increase timber production 30-50%, unidentified superior tree seedling afforestation can increase timber output 10%, identified by the increase of 20-30%. The so-called seed, is traits meet the specific requirements of the fine seeds. Due to different species, cultivation purposes, different requirements. Cedar, pine, camphor and other timber forests, timber forests have the standard requirements. Camellia oleifera and other economic forest, the economic forest requirements. The same is the foreign pine, masson pine, due to grease or timber for different business purposes, the required standard is not the same. But generally speaking