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1998年 ,在福建南洲林业采育场进行了杉木纯林和杉木泡桐混交林林地土壤物理性质的对比研究。与相同立地条件杉木纯林相比 ,杉木与泡桐混交之后 ,土壤结构体破坏率降低 8 34%～ 9 1 6%,非毛管孔隙度、毛管孔隙度、总孔隙度和通气度分别提高 2 4 8%,2 0 1 %,4 4 7%和 2 74%。说明混交林地土壤结构性能变好 ,土壤物理性状有所改善 ,从而促进林木生长 ,提高林地生产力。杉木泡桐混交林中 ,杉木的胸径、树高和蓄积量以及整个林分的蓄积量 ,都明显比相同立地条件下杉木纯林的大。表 3参 8
In 1998, a comparative study on the soil physical properties of mixed forest of Chinese fir and Paulownia was carried out in the forestry mining site of Nanzhou, Fujian Province. Compared with pure Chinese fir plantation with the same site condition, the failure rate of soil structure decreased by 8 34% ~ 91.6% after mixed with Chinese fir and paulownia, and the non-capillary porosity, capillary porosity, total porosity and aeration increased by 24 48 %, 20 1%, 4 4 7% and 2 74%. The results showed that the soil structure and properties of the mixed plantation improved and the physical properties of soil improved, which promoted the growth of forest and increased the productivity of forestland. In the mixed plantation of Chinese fir and paulownia, the diameter at breast height, height and volume of Chinese fir and the volume of the entire forest were significantly larger than those under the same site conditions. Table 3 Reference 8