钾水平对巴西橡胶树幼苗磷组分和酸性磷酸酶活性的影响

目的]研究不同钾水平对巴西橡胶树（Hevea brasiliensis）幼苗各器官磷组分和酸性磷酸酶活性的影响。方法]采用水培试验。试验材料为巴西橡胶树RRIM600种子实生幼苗,K2O浓度分别为0、1、10、50、250 mg/L。结果]缺钾降低了橡胶幼苗各器官中可溶性磷含量及其比例,但提高了橡胶幼苗各器官中不可溶性磷含量及其比例。橡胶幼苗各器官中可溶性磷含量差异显著,且大小顺序为根〉皮〉叶,而不可溶性磷含量在根中极显著大于叶和茎部的皮,但根和茎部的皮中不可溶性磷含量差异不显著。酸性磷酸酶活性在各器官之间差异极显著,但同一器官中,不同钾营养浓度下,酸性磷酸酶活性则差异不显著。结论]该揭示了不同钾水平下天然橡胶幼苗不同器官磷组分特性和酸性磷酸酶活性的变化特点,可以为天然橡胶生长中的磷钾营养合理配施奠定理论依据。

Effects of Different Potassium Levels on Components of Phosphorus and Activities of the Acid Phosphatase in H.brasiliensis Seedlings

Objective] The aim was to study the effects of different potassium levels on components of phosphorus and activities of acid phosphatase in different organs of H.brasiliensis seedling.Method] Seedlings derived from seeds of rubber trees of Clone RRIM600(H.brasiliensis) were grown under hydroponic culture at different levels of potassium(K2O concentration was 0,1,10,50,250 mg/L) to determine their components of phosphorus and the activities of the acid phosphatase.Result] The results indicated that the contents of the soluble phosphoruses and the ratios were decreased under the deficiency of the potassium nutrients,but increased the contents and the ratios of the insoluble phosphorus.The results of significance test of difference indicated that the contents of the soluble phosphorus which were the highest in roots,secondly in skins of the stem,thirdly in leaves were significantly different in different organs,but the contents of the insoluble phosphorus in the roots were significantly greater than the contents in the leaves and the skins of the stem,moreover the contents of the insoluble phosphorus were not significant different between the roots and the skins of the stem.The activities of the acid phosphatase were highly significantly different among the different organs,but oppositely in same organs under the different levels of potassium.Conclusion] The study reveals the components characters of phosphorus and activities change law of the acid phosphatase in different organs of H.brasiliensis seedling under different potassium levels,can lay theoretic basis for reasonable application of potassium and phosphorus during the growth periods of H.brasiliensis.