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通过对野外试验和室内测试数据的整理分析．比较研究了杉木火力楠混交林和 杉木纯林养分归还、吸收等生态过程的特征以及生产力结果表明混交促进了养分归还过 程．可提高土壤肥力和系统生产力．１５年生混交林技和叶凋落物分别是纯林的２倍和３ 倍，其中容易分解的火力楠凋落物占 ６４％．混交林通过凋落物分解所归还的养分是纯林 的 ２～ ３倍．相当年凋落量 ６５． ９％的混交林根系年死亡量是纯林的 ２倍，在整个系统养分 归还中占有很大的份额．混交林土壤全 Ｎ、 ＮＨ＋４－Ｎ和有效 Ｋ分别比纯林提高 ６４． ３％。 ８２． ３ ％和 ６３． １％．与此同时土壤孔隙组成和水分过程也大为改善．混交林生产力较纯林 提高５２．７％．混交林５种大量元素的归还／吸收比率是纯林的２倍，表明混交林养分循环 效率较高，较少的人为维持可以保持较高的生产力水平．
Through the field test and indoor test data analysis. The characteristics of ecological process such as nutrient return and absorption of C. mongolica mixed with Cunninghamia lanceolata and Cunninghamia lanceolata plantation and their productivity were compared. The result showed that the mixture promoted the nutrient return process. Can improve soil fertility and system productivity. The 15-year-old mixed forest techniques and leaf litter were 2 times and 3 times of pure forests, respectively, of which 64% of the litters were easily decomposed. Mixed forest litter decomposed by the return of nutrients is pure forest 2 to 3 times. The amount of annual litter 65. 9% of mixed forest root annual deaths are 2 times the pure forest, accounting for a large share of the entire system of nutrient return. The contents of total N, NH + 4-N and available K in the mixed forest soil were increased by 64% compared with the pure forest. 3%. 82. 3% and 63. 1%. At the same time, the composition of soil pores and the moisture process are greatly improved. The productivity of mixed forest is 52.7% higher than pure forest. The return / absorption ratio of five macronutrients in mixed forest was twice that of pure forest, indicating that the nutrient cycling efficiency of mixed forest was high, and the less man-made maintenance could maintain higher productivity.