油茶幼林营养元素吸收及其分配特征

Accumulation and distribution of nutrient elements in young Camellia oleifera

【目的】了解油茶各器官和营养元素吸收、累积及分配特征,为油茶林地施肥管理提供科学依据。【方法】以长势较好的5.5年生油茶林为调查对象,测定其树干、树枝、树叶、主根和侧根的营养元素含量,分析营养元素吸收及分配特征。【结果】油茶各器官营养元素含量的排列顺序大致为N>K、Ca>Mg>P>Fe、Mn>Zn>B>Cu。油茶不同器官营养元素总含量的排列顺序:树叶>侧根>树枝>主根>树干。油茶树体营养元素贮藏总量为14.65g/株,其中,N、K、Ca的贮存量最高,其次是P、Mg、Fe、Mn,Cu、Zn、B最低。油茶各器官营养元素贮存量的顺序排列:树叶>树干>主根>树枝>侧根。【结论】油茶树体N、K、Ca元素的吸收和累积量最高,营养元素的分配与各器官的生物量不成比例关系,树叶和树干营养元素贮存量最高。

[Objective ]The purpose of the study was to understand accumulation and distribution of nutrient elements in different parts of young Camellia oleifera in order to develop proper fertilization techniques for forest lands of Camellia oleifera. [Method ]The nutrient element contents of trunk, branches,leaves, taproot and lateral roots of S.5-year old Camellia oleifera were analyzed. [Result]The concentration of nutrients in Camellia oleifera was found in the following descending order： N〉K, Ca〉Mg〉P〉Fe and Mn〉Zn〉B〉Cu. The order of total nutrient content in different plant parts was as follows ： leaf〉lateral root〉branch〉taproot〉trunk. Total quantity of ten nutrient elements in young Camellia oleifera was recorded as 14.65 g per plant. The storage of N,K,and Ca was recorded as the highest,followed by P,Mg,Fe and Mn,and the storage of Cu,Zn and B was recorded as lowest. The order of total storage of ten nutrient elements in young Camellia oleifera was leaf〉trunk〉taproot〉branch〉lateral root. [Conclusion]The quantity of absorption and accumulation of N,K and Ca in Camellia oleifera was recorded as the highest. The application of Ca and trace elements may be considered in fertilizing young Camellia Oleifera. There was no any proportionate relationship between distribution of nutrient elements and biomass of different plant parts. The total storage of ten nutrient elements in leaf and trunk was recorded as the highest.