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28年生人工油松林的建群种——油松各器官化学元素浓度由叶、小枝、枝和树干逐渐下降。叶内元素浓度高低,以碳、氮、钙、钾、镁、磷为序。地下部分细根较粗根的元素浓度为大。灌木的化学元素的共同特点是碳含量最高,其次为氮、钾和钙。灌木叶片中的元素浓度大于茎。草本植物地上部分元素浓度明显低于灌木叶。灌木根系内化学元素浓度均低于它的地上部分。枯枝落叶的化学成分与活的枝、叶相比,铁的浓度显著增加,其次为铝,其他元素的浓度或多或少有所下降。在人工油松林各层次植物中,以碳素积累量最高,其次为钙和氮。元素的存留量仍以碳素为高,其次在乔木层中存留量以钙较大,在灌木层中以氮、钾较高。元素的年归还量除碳以外,钙较高,钾、磷较低。人工林的吸收量/土壤贮量的比值,以钾和磷较高。土壤中代换性钾、磷的贮量相对不大,为促进人工林生长,增施磷肥和钾肥将是有效的。
The concentrations of chemical elements in the organs of Pinus tabulaeformis decreased gradually from leaves, twigs, branches and trunks. Leaf elemental levels, with carbon, nitrogen, calcium, potassium, magnesium, phosphorus order. The underground part of the coarse roots of coarse root element concentration is large. Common features of shrub chemical elements are the highest carbon content, followed by nitrogen, potassium and calcium. The concentration of elements in shrub leaves is greater than that of stems. Elemental concentrations of herbaceous plants were significantly lower than shrub leaves. Shrub roots chemical element concentrations are lower than its aerial parts. The chemical composition of litter compared with live branches and leaves, the concentration of iron increased significantly, followed by aluminum, other elements of the concentration decreased more or less. In all levels of plantation pine oil plant, the highest carbon accumulation, followed by calcium and nitrogen. The remaining carbon content of the elements is still high, followed by the remaining in the arbor layer of calcium is larger, in the shrub layer of nitrogen and potassium higher. The annual return of elements other than carbon, the higher calcium, potassium, phosphorus lower. Absorption of plantation / soil storage ratio to potassium and phosphorus higher. Substitution of soil potassium, phosphorus storage is relatively small, in order to promote plantation growth, the increase of phosphate and potassium fertilizer will be effective.