不同砧木砂糖橘树体内Ca素含量的分布特点

Concentration of Ca in the tree body of Shatang mandarin on different rootstocks

【目的】探讨不同砧木砂糖橘树体内Ca素含量的分布特点。【方法】采用整株肢解法,于果实成熟期(2008-01-05)将7年生酸砧和枳砧砂糖橘树体分为23个部位,分别测定各个部位的生物量和Ca素含量。【结果】枳砧砂糖橘根部的Ca素含量显著高于酸砧,枝干、叶和果实Ca素含量与酸砧差异不显著。砂糖橘枝干和枝干木质部Ca素含量均随着部位粗度的增加而降低,而枝干皮部Ca素含量变化则相反,枝干和枝干木质部Ca素含量变动幅度以枳砧较大,枝干皮部则以酸砧较大;砂糖橘果皮Ca素含量显著高于果肉;叶片和叶柄之间Ca素含量差异不显著。在2种砧木中,除根颈外,砂糖橘根部Ca素含量均为须根>侧根>主根,但枳砧根颈、须根Ca素含量均显著高于酸砧。【结论】砧木对砂糖橘根部Ca素含量有显著影响,对叶、枝干、果实Ca素含量影响甚微。

【Objective】 The study was to explore the distribution characteristic of calcium concentration in Shatang mandarin trees on different rootstocks.【Method】 Seven-year-old Shatang mandarin trees on sudacih and trifoliate(Poncirus trifoliate) rootstocks were uprooted and divided into 23 parts in mature period and the biomasses and Ca concentrations of different parts were measured.【Result】 The Ca concentration of Shatang mandarin in roots was significantly higher on trifoliate rootstock than that on sudacih root...