5种阔叶树幼苗的养分积累和分配规律

研究了观光木(Tsoongiodendron odorum)、女贞(Ligustrum lucidum)、山杜英(Elaeocarpus sylves-tris)、乳源木莲(Manglietia yuyuanensis)和乐昌含笑(M ichelia chapensis)幼苗的养分积累和分布。结果表明:观光木各器官干重为根>叶>干,女贞为干>根>叶>枝,山杜英为枝>叶>根>干,乳源木莲为根>干>叶,乐昌含笑为叶>干>根>枝。各树种干的养分浓度最低。除了观光木外,其余树种均以叶的养分浓度为最高。观光木的养分贮量为根>叶>干,女贞和山杜英为叶>枝>根>干,乳源木莲为叶=干>根,乐昌含笑为叶>干=根>枝。5种幼苗各器官的养分贮量多为N>K>P。

Accumulation and Distribution of Nutrients in Seedlings of Three Broad-leaved Tree Species

The paper analyzed accumulation and distribution of nutrients in seedlings of broad-leaved Tsoongiodendron odorum,Ligustrum lucidum,Elaeocarpus sylvestris,Manglietia yuyuanensis and Michelia chapensis tree species.The order of dry weight in various organs was roots> leaves>stem for T.odorum,stem>roots> leaves>branches for L.lucidum,branches>leaves>roots>stem for E.sylvestris,roots>stem>leaves for M.yuyuanensis and leaves>stem>roots>branches for M.chapensis.Nutrient concentrations were the lowest in stem and the highest in leaves except for T.odorum.Generally,the order of nutrient concentrations was N>K>P.The order of total amount of nutrients in various organs was roots>leaves>stem for T.odorum,leaves>branches >roots>stem for L.lucidum and E.sylvestris,leaves and stem >roots for M.yuyuanensis,and leaves>stem and roots>branches for M.chapensis.The amount of nutrients in the five seedlings was generally ranked in turn N>K>P.