南酸枣人工林早期生长特性及其与杉木混交效应研究

Study on Early Growth Characteristics of Choerospondias axillaris Plantation and Effect of Choerospondias axillaris and Cunninghamia lanceolata Mixed Stand

以营造在福建邵武6年生南酸枣与杉木不同模式混交林及其纯林和5年生南酸枣密度试验林为研究对象,对南酸枣人工林早期生长规律、不同立地条件下人工林生长差异、不同造林密度对南酸枣早期生长的影响、以及与杉木混交后不同模式林分的生产力、生物量差异和对林地土壤肥力的影响进行了研究。结果表明:南酸枣早期生长快,在中等肥力立地上,6年生平均高为8 53m,平均胸径9 74cm,立木蓄积量86 08m3·hm-2,在不同立地条件下生长差异明显;造林密度对南酸枣早期生长的影响表现出密度越大立木蓄积量和枝下高越大,冠幅越小的趋势。与杉木混交后能促进杉木的生长和有利于维护地力,其中以杉3∶南1(3∶1)混交模式生产力和生物量较高,蓄积量为76 42m3·hm-2,生物量为41 5127t·hm-2,与杉木纯林相比,分别提高了74 55%和97 27%,是值得推广的杉阔混交模式。

Taking 6-year-old Choerospondias axillari pure stand and mixed with Cunninghamia lanceolata in different patterns and 5-year-old Choerospondias axillaris stands in different densities as trial sites,the early growth pattern of Choerospondias axillaris,difference of plantation growth on different site conditions,the influence of different planting density on early growth of Choerospondias axillaris,the stand productivity when mixed with Cunninghamia lanceolata in different patterns,the difference of biomass and effect on soil fertility were studied.The results showed that Choerospondias axillaris grew fast in the early stage.On the site with medium fertility,the mean height increment,mean dbh and stock volume of 6-year-old Choerospondias axillaris were 8.53 m,9.74 cm and 86.08 m^3 respectively.The growth differences under different site conditions were significant.The influence of planting density on the early growth of Choerospondias axillaris demonstrated the higher the density,the higher the stock volume and the height of branch,and the smaller the crown width.The Choerospondias axillaris stand mixed with Cunninghamia lanceolata could promote the growth of latter and benefit the fertility maintenance.The results showed that the pattern of Choerospondias axillaris and Cunninghamia lanceolata mixed in the ratio of 3∶1 had the highest productivity and biomass,i.e.stock volume 76.42 m^3·hm^(-2),biomass 41.512 7 t·hm^(-2),which were 74.55% and 97.27% higher compared with that of pure Cunninghamia lanceolata stand respectively.It was proved that this pattern was worth to be extended.