杉木人工林与米储次生促进林生产力和土壤肥力比较

通过对常绿阔叶林采伐迹地进行人工促进天然更新的以米槠为主的次生林(人促落)和营造杉木人工林24a后的比较研究，结果显示人促群落乔木层组成树种为27种，灌木层种类为49种，而对照(杉木人工林)的则分别为12种、32种，人促群落树种组成和结构比对照的复杂。人促群落林分生产力(单位面积蓄积加316.912m2/hm2)亦比对照的(单位面积蓄积量283.288m3/hm2)高。与对照的相比，人促群落0cm～20cm土层土壤哮聚长、＞0.25mm水稳性团聚体含量分别高3.17％、5.65％，而分散系数、结构体破坏率分别低11.94％、5.01％；土壤总孔隙度和非毛管孔隙度分别高7.12％、1.75％；土壤容重低14.97％；有机质含量高7.602g/kg；土壤酶活性较强，呼吸作用强度较大。这表明人促群落土壤结构性能、土壤保肥和供肥能力、土壤手化作用强度比对照均有较明显的提高。说明在常绿阔叶林采伐迹地上，采用人工促进天然更新是恢复常绿阔叶林，维持林地长期生产力较好的模式之一。

Comparison of Productivity and Soil Fertility Between the Castanopsis carlesii Community with Artificial Measures Promoting Regeneration and Cunninghamia lanceolata Plantation

The secondary forest dominated by Castauopsis carlesii with artificial measures promoting regeneration (AMPR) and Cunninghamia lanceolata plantation (control) reforested on slash area of evergreen broad-leaved forest after 24 years was compared. The results showed that the species amount of tree, shrub stratum of AMPR was of 27,49 respectively, while that of the control was of 12,32. The tree species composition and structure of AMPR stand were more complex. The stand volume of AMPR was of 316.912 m3/hm2, but that of the control was of 283.288 m3/hm2. In 0～20cm soil depth, the AMPR soil degree of aggregation, contents of ＞0.25mm waterstable aggregate increased by 3.17％，5.65％ respectively, while thebulk density, dispersion ratio, destroy rate of ped decreased by 14.97％，11.94％，5.01％ each. The total porosity, non-capillary porosity increased by 7.12％，1.75％；the ontents of organic matter increased by 7.602 g/kg； the soil enzymes activity and soil respiration intensity were enhanced compared with the control. It revealed that the soil structure properties, the capability of containing and supplying fertility and soil biochemical action intensity of AMPR were improved obviously. All above indicated that AMPR is one of the good patterns, which could recover evergreen broad-leaved forest and maintained long-term site productivity.