杉木泡桐混交幼林地土壤的物理性质

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％～９．１６％，非毛管孔隙度、毛管孔隙度、总孔隙度和通气度分别提高２．４８％，２．０１％，４．４７％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

Studies on physical characters of soil in mixed forest of Chinese fir and paulownia

In 1998,the contrasting study was carried out about soil physical structure properties of mixed forest of Chinese fir and paulownia and pure Chinese fir stand in Nanzhou Forest Farm of Fujian.Productiveness of the mixed forest is better than that of the pure fir stand.Soil water and physical properties of the mixed forest,such as soil particle composition,soil aggregate,soil pore space,water content of soil,etc.,were better than those of the pure plantation.Noncapillary porosity,capillary porosity,total porosity and gas permeability of soil in the mixed forest increased by 2 48%,2 01%;4 47% and 2 74% respectively.The resultant reason was further discussed in this paper.