银杏不同营养器官中营养元素含量季节动态的研究

通过对不同时期银杏根、茎、叶中８种主要元素的含量分析，研究了不同器官中营养元素含量的季节动态．结果表明，不同器官中各元素浓度随器官生长发育而呈现规律性变化，叶、枝、梢的需养期具有重叠的特点，５月初到６月中旬是各种器官需养的关键期．６月中旬到７月上旬叶片中各种营养元素含量变化相对稳定，是叶分析的最佳时期．平均而言，不同器官中Ｎ，Ｐ，Ｋ含量均是Ｎ＞Ｋ＞Ｐ，叶中含Ｎ最高，枝中含Ｐ，Ｋ最高，根中Ｎ，Ｐ，Ｋ含量均相对较低；微量元素各器官中均是Ｆｅ＞Ｍｎ＞Ｚｎ，根中Ｆｅ，Ｍｎ和Ｚｎ的含量最高，且变幅最大

Seasonal Dynamics of Nutrient Elements in Different Nutritoriums of Ginkgo biloba

Eight nutrient elements in root,current shoot and leaf of Ginkgo biloba were analyzed through the growing period. The results showed that the concentrations of nutrient elements in different vegetative organs varied with the growing course, but the period of their nutrient uptake overlaped to some extent, and all them uptook more nutrient elements from the beginning of May to the middle of June. From the middle of June to the beginning of July the most of nutrient elements in leaf had a variation with little fluctuation, so it's a good time for nutrition inspection. Through the whole season, the average concentration of macroelements in different vegetative organs was all N>K>P, and there was a higher concentration of N in leaf, but higher concentration of P and K in current shoots. For microelements, the concentration was all Fe>Mn>Zn, and they were all the highest in root.