鸭梨幼龄和成树叶片中营养元素周年变化规律研究  

Study on Annual Change Rule of Nutritive Elements in Young and Mature Leaves of Yali Pears

作　　者：卢伟红[1,2] 张玉星[1] 

机构地区：[1]河北农业大学园艺学院,河北保定071001 [2]保定职业技术学院,河北保定071051

出　　处：《北方园艺》2013年第14期40-43,共4页Northern Horticulture

摘　　要：以4a生、10a生鸭梨树为试材,测定比较了鸭梨幼龄树和成龄树叶片10种营养元素含量的变化,以揭示幼龄树与成龄树营养需求和分配的差异。结果表明:幼龄和成龄鸭梨树10种营养元素周年动态变化规律基本一致,N、P、K、Cu元素展叶时含量最高,以后随叶龄增加而逐渐降低,Zn、B元素含量先降低,以后逐渐增加,到6月中旬以后维持一定含量,Mn、Fe、Mg、Ca元素含量则随叶龄增加而逐渐增高,落叶时含量达到最高,其中Ca元素含量增加较迅速。成龄鸭梨树叶片中K、Mg元素含量高于幼龄树,P、Ca、Fe、Cu、Zn、B元素含量低于幼龄树,在6月份之前成龄树叶片中N、Mn元素含量高于幼龄树,之后幼龄树叶片高于成龄树。Taking 4-year-old and 10-year-old pear as materials, the contents of mineral elements in the young and mature leaves of Yali pears in different growth periods were measured, to reveal the nutritional requirement and the difference distribution of the young and mature Yali pears~ trees. The results showed that the annual changes of 10 kinds of nutritive element showed the same pattern in both mature and young trees. The contents of N,P,K and Cu were peaked in the leaf flushing period,and then would reduce gradually as the foliar age increased. The contents of Zn and B went down at the beginning, then increased gradually, and maintained a certain level after Mid-June. The contents of Mn, Fe, Mg and Ca would increase gradually along with leaf growth,and peaked in the defoliation stage,during which the Ca element content increased rapidly. The contents of K and Mg in the leaves of mature trees were higher than those of young trees,but the contents of P,Ca,Fe,Cu,Zn and B in the leaves were less. The contents of N and Mn in the leaves of mature trees were higher than those of young trees before June, but thereafter they were lower than those of young trees.

关 键 词：鸭梨 叶片 营养元素 周年变化 

分 类 号：S661.2[农业科学—果树学]