Abstract: Objective]Iron deficient chlorosis is an important nutritional disorder of Korla Fragrant Pear (Pyrus Bretschneideri Rehd)grown in calcareous soil in Southern Xinjiang,China.Infusion of iron fertilizer treatment method is expected to become an effective means for treatment of chlorosis of fruit trees.[Method]With the orange chelate generated by orthophenanthroline and ferrous sulfate as tracer material,a simulation test on the transport velocity and concentration distribution characteristics of iron on each part of Pyrus betulifo-lia Bunge after being instilled with iron was performed in the study.[Result]The result showed that the con-tent of iron of test tree with red iron liquid was much higher than the contrast test tree.Active iron and total i-ron contents in treatments were much higher than those in the control (7.5;-435.1;)and (10.2;-341 .9;),respectively.In trunk infusion experiment,Fe transportation speed to the canopy in the trunk was much greater than that downward in the root (49 .00;).Dilution effect of ferrite concentration was observed in the trunk infusion as well as in the root injection.[Conclusion]In the trunk or root infusion,the phenome-non of iron inactivation was observed.Measuring concentration of iron revealed that the trunk infusion was more effective in iron transport and anti-inactivation compared with root infusion.It was suggested to apply trunk infusion to correct iron deficiency chlorosis of fruit trees.

摘要： 【目的】因缺铁而产生的叶片失绿黄化，是新疆塔里木盆地钙质土壤上栽培的库尔勒香梨的一种严重生理性病害。研究滴注铁肥治疗法，为矫治果树缺铁黄化病提供有效措施。【方法】研究以邻二氮杂菲与硫酸亚铁生成的桔红色螯合物为示踪剂，模拟检测滴注施铁后在杜梨树体根系和树干部位木质部汁液中的铁素转运速度和浓度分布特点。【结果】供试树有红色铁液部位，有效铁含量和总铁含量分别高于对照供试树（7.5;～435.1;）和（10.2;～341.9;）。树干滴注实验中铁素在树干木质部的向树冠上转移速度要大于向根系下移速度（49.00;），且铁素浓度随着转移路程的延长，其稀释效应表现明显，根系注射也表现出同样的规律。【结论】在树干和根系滴注中均发现了滴注铁肥在木质部内发生的铁素失活现象。与根系滴注相比，树干滴注在铁的运输距离和抗失活方面优势更明显。选用树干滴注的方法矫治果树缺铁黄化病。