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比较3年半生的红椿、台湾桤木、檫木与巨桉混交的混交林和巨桉纯林的土壤理化性质、凋落物量和养分含量特征.结果表明:红椿、台湾桤木和巨桉混交都有助于减缓土壤的酸化.檫木与巨桉混交能显著改善土壤容重、持水量、孔隙状况,檫木与巨桉混交也能显著增加土壤的全C、N、P、K含量,分别增加了64.7%、41.9%、28.6%、7.7%.台湾桤木与巨桉混交也能显著增加土壤的全C、N、P含量,分别增加了15.2%、27.9%、47.6%.3种混交林土壤水解N都显著低于巨桉纯林,有效P都显著高于巨桉纯林,只有台湾桤木与巨桉混交能显著增加土壤速效K含量,其他两种混交林土壤速效K较纯林显著降低.巨桉红椿混交林凋落物枝、叶现存量都显著高于巨桉纯林,巨桉檫木混交林凋落叶量、凋落物总量略低于巨桉纯林,分别降低了9.8%、9.3%.巨桉台湾桤木混交林凋落物枝、叶现存量都显著低于巨桉纯林.3种混交林凋落物中C元素含量都显著低于巨桉纯林,N元素含量都显著高于巨桉纯林,台湾桤木与巨桉混交能显著增加凋落物中P元素含量,檫木与巨桉混交能显著增加凋落物中K元素的含量.综合考虑各项指标,在此类混交模式下为巨桉选择混交树种,檫木相对最优,台湾桤木次之,红椿则不宜.
The characteristics of soil physical and chemical properties, litterfall and nutrient content of mixed stands of mixed tree and giant eucalyptus grandiflora mixed with Alnus sibirica, Alnus cremastogyne and Eucalyptus grandis in three and a half years were compared.The results showed that: Mixed with aloe can help to slow the soil acidification.Alderwood mixed with E. grandis can significantly improve soil bulk density, water holding capacity, pore condition, Alnus cremastogyne and E. grandis can significantly increase the soil C, N, P, K content, Respectively, increased by 64.7%, 41.9%, 28.6% and 7.7%, respectively. Mixing of Alnus creosote and Eucalyptus grandiflora could significantly increase soil total C, N and P contents by 15.2%, 27.9% and 47.6% Soil N in mixed forest was significantly lower than that in pure E. grandis forest, and the effective P was significantly higher than that in pure E. grandis forest. Only the hybrids of Alnus cremastogyne and E. grandis could significantly increase the content of available K, but the available K in the other two mixed forests Pure Linlin decreased significantly.The total amount of litter branches and leaves in the mixed forest of E. grandis was significantly higher than that of pure E. grandis and E. grandiflora mixed forest, Decreased by 9.8% and 9.3%, respectively.The litter branches and leaves in the mixed plantation of E. grandiflora in Taiwan were significantly lower than those in E. grandis The content of C in litter of mixed forest was significantly lower than that of pure Eucalyptus grandis, and the content of N was significantly higher than that of pure Eucalyptus grandiflora. Mixing of Alder and Eucalyptus grandis could significantly increase the content of P in litter, Alnus cremastogyne mixed with Eucalyptus grandis could significantly increase the K content in litter.Considering all the indicators, mixed tree species were selected for Eucalyptus grandiflora in this mixed mode, Alnus cremastogyne was the best, followed by Taiwan alder, It is not appropriate.