日本栗叶片矿质营养元素含量年动态变化的研究

2005~2006年连续2 a对日本栗（Castanea crenata）叶片中N、P、K、Ca、Mg矿质营养元索含量及其年周期变化进行了研究。结果表明:日本栗叶片中N、P、K、Ca、Mg元素的含量在年周期内呈规律性变化，且各元素间存在一定相关性；不同树龄日本栗叶片N、P、K、Mg元素含量差异极显著；利用叶分析指导施肥时，采取叶样的时期应在生长季前期，即叶片速生期；生长季前期叶片内N、P、K含量与当年结苞数存在极显著正相关，但并不是决定当年结苞数的唯一影响因素。西北林学院学报23卷第4期郑瑞杰等日本栗叶片矿质营养元素含量年动态变化的研究

Annual Dynamic Changes of the Mineral Nutrition Contents in Leaves of Castanea crenata Sieb. et Zucc

The contents of mineral nutrients (N,P,K,Ca and Mg) and annual dynamic changes in the leaves of Castanea crenata Sieb.et Zucc. were studied in 2005 and 2006. The results showed that some regulaties exhibited in the contents of the nutrients, and there existed correlation among the nutrients, and significant differences were found among the trees with different ages. While instructing the fertilizer application with the method of leaf analysis, the period of picking leaves was the earlier period of growth season leaves fast growing time; The contents of mineral nutrition (N,P and K) at the earlier period of growth season showed significantly positive correlation with fruit number, but that wasn’t the only influencing factor.