早实薄皮核桃叶片矿质元素年变化规律研究

Annual changes rule of leaf mineral element contents in early bearing and pellicle walnuts

以早实薄皮核桃"绿岭"为试材,对核桃叶片矿质元素含量的年变化进行了研究。结果表明:核桃叶片含N量在1年中的变化呈单峰曲线,前期高后期低;叶片含P量在展叶后期(4月9日)最高,随后逐渐下降,树体恢复期降到最低;叶片含K量在展叶后期(4月9日)最高,为1.92%,而后呈不断下降趋势,果实成熟期(8月21日)降至最低,树体恢复期(9月21日)稍有上升;叶片含Ca量随着生长期的推移而不断增加;叶片含Mg量为展叶后期至盛花期降低,而后逐渐上升,硬核期达到高峰,此后有所下降,果实采收后,达到0.57%,为最高值;叶片含Mn量在展叶后期最低,硬核期增加至最高,为977.892 mg/kg,而后下降,果实成熟期出现第2次低谷,树体恢复期有所上升;核桃叶片含Zn量硬核期最低,为24.9 mg/kg,此后急剧上升,果实成熟期达到最高,为111.2 mg/kg,随后又急剧下降。

The annual changes rule of leaf mineral element contents of early bearing and pellicle walnut ＇Lvling＇ was studied in this article.The results were as follows：Its N content showed single-peak curve in the year with the high level at prophase and low level at anaphase.Its P content was the highest in anaphase of leaf expansion（April 9th）,and then gradually declined to a minimum level till the tree body recovery stage.Its K content was 1.92%,the highest in anaphase of leaf expantion（April 9th）,then gradually declined to a minimum level till the mature stage（August 21）.At tree body recovery stage（September 21） it had increased slightly.The Ca content increased unceasingly along with developing of the growing period.The Mg content was lower at the stage from leaf expansion to flowering stage,and then rised gradually.At hardcore period it reached to a peak value then delcined.The Mg content achieved peak after harvest,and it reached 0.57%.The Mn content was minimum,it increased to 977.892 mg/kg of the maximum during the hardcore period,and then declined.At fruit mature stage,it appeared the second lowlands,it was increased slightly at the tree body recovery stage.The Zn content was 24.9 mg/kg in hardcore period,and it was the lowest.At the fruit mature stage it reached to 111.2 mg/kg of the highest level,and then declined sharply.