[ Objective ] To study the water conservation functions and soil fertility of Cunninghamia lanceolata and Schima superba mixed forests. [ Method] The biomass and soil fertility of Cunninghamia lanceolata and Schima superba mixed forests and Cunninghamia lanceolata pure plantations were studied. [Result] Compared with pure plantation, mixed forest greatly promoted the growth of trees, the average diameter at breast height and average tree height of Cunninghamia lanceolata in mixed forests were increased by 20% and 18. 97% , respectively. The total water storage volumes of mixed forests and pure plantation were 1 947. 98 t/hm and 1 640. 16 t/hm2 , respectively. The results also indicated that mixed forests can obviously decrease soil bulk density, increase soil porosity, and improve soil water regime, the mixed forests had a better effects on soil amelioration than pure plantations. In 0-20 cm soil layer, the organic matter, total nitrogen, total phosphorus, available potassium, available phosphorus, hydrolyzable nitrogen of mixed forests were increased by 34. 05% , 47. 66% , 19. 29% , 55. 04% , 49.15% and 20.63% , respectively compared with pure plantations, and under 20 -40 cm layers, the soil nutrients that mentioned above attained a different degrees of enhancement. [ Conclusion ] The study provided theoretical references for studying the ecosystem functions of mixed forests and realizing the sustainable management of forestry.%[目的]研究杉木—木荷混交林土壤肥力与水源涵养功能.[方法]通过对23年生杉木—木荷混交林以及杉木纯林的生物量和土壤进行调查.[结果]与纯林相比,混交林更能促进林木生长,混交林中的杉木的平均树高、平均胸径比纯林中的杉木分别提高了20％、18.97％.混交林林分的总蓄水量为1 947.98 t/hm2,纯林林分总蓄水量为1 640.16 t/hm2,混交林能明显降低土壤容重,增加土壤孔隙度,改善土壤水分状况,同时混交林比纯林具有更好的改土培肥作用,0 ～ 20 cm土层中,混交林土壤的有机质、全氮、全磷、速效钾、有效磷、水解氮分别比纯林中提高34.05％、47.66％、19.29％、55.04％、49.15％和20.63％,而在20～ 40 cm土层中各种养分均得到不同程度的提高.[结论]与纯林相比,混交林的营造对林木生长、土壤的物理性质、土壤肥力以及水源涵养均具有良好的改良作用.
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