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培育杉木良种壮苗,提高造林成活率,是加快杉木用材林基地建设,达到速生丰产的重要措施之一。在生产实践中发现,苗木粗壮、顶芽饱满、根系发达的苗木,造林成活率高,生长迅速;而纤细幼嫩的苗木,不是因受不住霜冻的袭击就是因不耐干旱考验而死亡,幸存者也是活而不长,或是生长缓慢。因此,造林成活率的高低与苗木的质量好坏有密切关系。为了提高苗木的粗壮度,以往在育苗过程中,往往是采取间苗和增肥的技术措施,化去了大量的间苗用工,育苗用种也是一笔很大的浪费。自一九七五年以来,我们开展了杉木播种量的试验,取得了满意的效果,现将试验结果小结如下:
Nurturing fir seedling strong seedlings, improve afforestation survival rate, is to speed up the fir timber base construction, to achieve fast-growing and yielding one of the important measures. Found in the practice of production, seedling sturdy, full of top buds, developed root system of seedlings, afforestation survival rate, rapid growth; and delicate young seedlings, not because of unbearable frost attack is due to the drought test of drowsiness, Survivors also live longer, or grow slowly. Therefore, the survival rate of afforestation is closely related to the quality of seedlings. In order to improve the robustness of nursery stock, in the past in the process of nursery, often take the technical measures of thinning and fattening, to go to a large number of Miao Miao labor, seedling is also a great waste. Since 1971, we have carried out experiments on the sown area of Chinese fir and have achieved satisfactory results. The summary of the test results is as follows: