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为了丰富祁连山水源涵养林的树种资源,改造树种结构、增强森林水源涵养效益、实现速生、丰产、优质。从1969年开始引进的华北落叶松(Larx Princip—rupprechfii),长白落叶松(L. dgensis)、新疆落叶松(L. sibirica)、兴安落叶松(L. gmelinii)、日本落叶松(L. Leptolepis)和红杉(L. potaninii)等六种落叶松中,筛选出华北落叶松这一优良树种。经过十六年引种驯化试验,初步证明:华北落叶松适应性较强,生长发育正常,幼年阶段生长比青海云杉快1—2倍,已开花结实,有的已郁闭成林。
In order to enrich the species resources of Qilian Mountains water conservation forest, rebuild the tree species structure, enhance forest water conservation benefits, and achieve fast-growing, high yield and high quality. Larix Princip-rupprechfii, L. dgensis, L. sibirica, L. gmelinii, L. leptolepis, introduced from 1969, ) And Sequoia (L. potaninii) and other six kinds of larches, screened Larix principis-rupprechtii. After sixteen years of introduction and domestication experiments, initially proved: Larix principis-rupprechtii adaptable, normal growth and development, juvenile growth 1-2 times faster than the Qinghai spruce, has flowered, and some have closed forest.