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为弄清间伐对落叶松人工林内环境因子,进而对落叶松林内天然更新的影响,在辽东山区对40年生落叶松人工林进行了5种不同强度的间伐试验(分别为0%、10%、20%、30%和40%)。间伐后,对环境因子和更新状况进行了观测。结果表明,林冠开阔度随间伐强度增大而增加,间伐后其林冠下光量子数量、地表平均温度、不同层次土壤平均含水量与空隙度大小成线形关系;落叶松人工林间伐一年内,更新树种丰富度没有显著变化,而更新密度和更新频度都明显增加(p<0.05)。更新树种数量增加与树种特性有关,增长幅度为阳性树种>耐荫树种。所有的更新树种中,对林冠开阔度变化响应最大的是黄波罗(Phellodendronamurense)。实验结果证实了辽东地区落叶松人工林间伐后,更新数量变化与周围保留的树种分布、树种特性和立地条件有关。图9表2参43。
In order to understand the effect of thinning on environmental factors in Larix gmelinii plantation and then natural regeneration in Larix gmelinii plantation, five different intensity thinning experiments were conducted on 40-year-old Larix gmelinii plantations in the eastern Liaoning mountainous areas (0%, 10% 20%, 30% and 40%). After thinning, the environmental factors and the status of the update were observed. The results showed that the canopy openness increased with the increase of the thinning intensity. After the thinning, the quantum numbers of canopy light, the average surface temperature and the average soil water content at different levels were linear with the porosity. During one year of interstice larch plantation, There was no significant change in abundance, while the update density and update frequency increased significantly (p <0.05). The increase of the number of updated tree species was related to the characteristics of tree species, and the increase rate was positive species> shade-tolerant species. Of all the newer tree species, Phellodendron amurense, which responded the most to changes in canopy openness, was Phellodendron amurense. The results of the experiment confirmed that after the larch plantations were cut in the eastern Liaoning Province, the change of the number of updates was related to the species distribution of the remaining species, the characteristics of the tree species and the site conditions. Figure 9 Table 2 Reference 43.