【摘要】 对I-69杨和I-72杨2个杨树无性系人工林叶片营养元素的含量及季节性变化进行了研究,结果表明叶中N、P、K、Ca、Mg、Cu、Fe、Zn的含量随季节的变化而发生显著的变化。各营养元素的变化幅度分别为82 6%、82 2%、84 9%、94 2%、90 4%、84 6%、79 1%和91 2%。2个无性系叶片中常量元素的含量及变化规律相近似,而微量元素的含量及变化呈现不同的规律。更多还原

【Abstract】 The result showed that N,P,K,Ca,Mg,Cu,Fe,and Zn contents of leaves changed evidently with the seasonal change.The different nutrient element change ranges were 82.6%,82.2%,84.9%,94.2%,90.4%,84.6%,79.1% and 91.2%,respectively.The macro-element content and change regulations of the 2 clone leaf blades were close,whereas micro-element content and change regulations of those were different.更多还原