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对沅陵县保留擦木较多的天然混交林的营养元素空间分布进行分析测定,结果表明,擦木个体的营养元素含量因组织器官不同而发生变化,其中枝的养分含量随枝龄的增大而明显减少,根的养分含量表现为细根>粗根>大根>根头。其他主要混交树种,也表现为与擦木大体相一致的规律,在各混交类型中,林木生存空间的养分元素总贮量为1.9～3.8t/10~4m~2,其中乔木层为1.2～2.8t/10~4m~2,占林分总贮量的65～80%;下木层和草本层为0.2～0.5t/10~4m~2,占8～15%;枯枝落叶层为0.3～0.6t/10~4m~2,占10～24%。这些数据,为培育人工檫木混交林提供了可比的生产模式。
The analysis of the spatial distribution of nutrient elements in natural mixed forest with more retained mulching wood in Yuanling County showed that the content of nutrient elements in mulberry wood changed due to different tissues and organs. Large and significantly reduced, the root of the nutrient content showed fine root> coarse root> large root> root. The other main mixed tree species also showed the same rule as that of rubbing wood. In the mixed types, the total nutrient elements in the living space of the tree were 1.9 ~ 3.8t / 10 ~ 4m ~ 2, of which the tree layer was 1.2 ~ 2.8t / 10 ~ 4m ~ 2, accounting for 65 ~ 80% of the total stand volume of forest; the lower layer and the herb layer is 0.2 ~ 0.5t / 10 ~ 4m ~ 2, accounting for 8 ~ 15% 0.3 ~ 0.6t / 10 ~ 4m ~ 2, accounting for 10 ~ 24%. These data provide a comparable mode of production for cultivating artificial mixed forests.