论文部分内容阅读
采用高台整地方法在三江平原低湿地营造不同混交类型、混交方式、混交密度的扬树混交丰产林。１２年调查结果表明，小黑扬与云杉、樟子松、水曲松混交效果好，单位面积蓄积较纯林提高１１７％～１４２５％。培育大径级用材林，密度以３ｍ×６ｍ为宜。施有机肥能促进林木高、径和材积增长。
In the low wetlands of the Sanjiang Plain, high-terrace soil preparation methods were used to create a mixed plantation of high-yielding poplar with different types of hybrids, mixed and mixed densities. The results of 12 years showed that the combination of Xiao Yang and spruce, Pinus sylvestris var. Mongolicus and Quercus mongolicus was effective and the unit area accumulation was 117% -142.5% higher than pure forest. Cultivation of large-diameter timber, the density of 3m × 6m is appropriate. Application of organic fertilizer can promote high-growth, diameter and volume growth.