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为了探讨大垄造林对沼泽地土壤改良效果,我们于1983年秋,对我场1969年春季的大垄造林地的土壤进行了调查。共调查了三个林班的四块大垄造林地。这些林地在造林前都是常年积水的沼泽地,1968年秋用机械扣大垄,1969年春季造落叶松林,现均已郁闭成林。林分的平均直径7.1—8.3cm,平均树高11m,郁闭度达0.9—1.0,每公顷保存3000—4000株。大垄宽1.1 m,垄高50cm,调查时垄高40cm,垄距80—90cm。这次调查是在每个地块设一个临
In order to explore the effect of large-ridge afforestation on soil improvement in swampy soil, we investigated the soil of the large ridge afforestation in our field in the spring of 1969 in the autumn of 1983. A total of four forest classes were surveyed four large ridge afforestation. These forests are affluent swamps of perennial water before afforestation. In the autumn of 1968, they were buckled by large mechanical ridges. In the spring of 1969, larch forests were established, and the forest was closed. Forest average diameter of 7.1-8.3cm, the average height of 11m, canopy density of 0.9-1.0, 3000-4000 plants per hectare preservation. Large ridge width 1.1 m, ridge height 50cm, the survey ridge height 40cm, ridge distance 80-90cm. This survey is to set a temporary in each plot