菌根真菌对白梨树幼苗磷获取的影响  

Effects of AM Fungi on the Phosphorus Acquisition of Chinese White Pear Seedling

作　　者：金宝伟[1] 薛元霞[1] 张忠兰[1] 张志芬[1] 杨守军[1] 彭广霖[1] 

机构地区：[1]中国农业大学烟台研究院,山东烟台264670

出　　处：《湖北农业科学》2014年第8期1842-1844,1862,共4页Hubei Agricultural Sciences

基　　金：山东省烟台市科技发展计划项目(2011454)

摘　　要：以1年生的白梨树幼苗为试材,通过移栽过程中在根系附近添加50、100和150 mL不同剂量的菌根接种剂来研究菌根真菌对白梨树幼苗磷获取的影响。结果表明,菌根真菌添加120 d后,与对照相比,50、100及150 mL处理的定植率分别是对照的17.4、21.8和29.5倍,并且定植率与菌剂的添加量呈现较好的正相关关系;与定植率相反,菌根真菌明显降低了根际土的pH,菌根处理的pH分别是对照的93%、91%和87%。菌根真菌有效地改善了根际土中磷的有效性和叶片的全磷含量,处理间差异显著,两者均在菌根真菌接种后90 d达到最高值。菌根真菌促进了白梨树幼苗的生长,150 mL处理的株高及分枝数在真菌接种后的120 d分别比对照增加24%和47%。综合分析认为,每株添加150 mL的菌根真菌能较大程度地改善白梨树幼苗对磷元素的获取,促进幼苗的生长发育。The effects of AM fungi on the phosphorus acquisition of one-year-old Chinese white pear seedling were studied by the application of 50 mL, 100 mL and 150 mL arbuscular macorrhiza （AM） fungi agent into surroundings of root system when pear seedlings were transplanted. The results showed that AM fungi significantly increased the colonization rate in the root with the colonization rate of 50 mL, 100 mL and 150 mL being 17.4, 21.8 and 29.5 times more than that of the con-trol, respectively. A positive trend was found between application amount of AM fungi and colonization percentage. Contrary to colonization rate, AM fungi decreased pH in the soil of AM treatments significantly with 96%,92% and 87% of the con-trol. Phosphorus availability in soil and total content in leaves were improved and peak values were occurred at 90 days after AM fungi were reinforced into soil. Compared with the control, AM fungi enhanced the growth of pear seedlings. Especially in 150 mL treatment, plant height and branch number were increased by 24% and 72% after AM fungi successfully colonized in the roots. It is indicated that 150 mL agent of AM fungi per tree was the best choice for phosphorus acquisition and con-tribution for growth of pear seedling.

关 键 词：AM真菌 白梨树幼苗 磷 根际土 生长发育 

分 类 号：S718.81[农业科学—林学] S661.2