结果表明：松栎混交林对土壤的改良效果最好，草地次之，马尾松纯林则较差。
The results indicated that the effect of mixed masson pine and oak forest on soil amelioration was the best, that of grass was the second and the pure masson pine forest was the worst.
栎类次生林乔木的密度随高度级、径级的增加而递减，但树种丰富度却不随树木的密度增加而增加。
Tree density in the forest decreased with the increases of height class and diameter class, whereas species abundance did not increase.
油松和麻栎林土壤物理性质与造林密度也有很强的相关性。
Chinese pine and hemp oakery soil physical property also have very strong correlativity with forestation density.
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