秸秆还田方式对玉米田AM真菌侵染效应及球囊霉素含量的影响

Effects of Straw Return Method on AM Fungi Infection and Glomalin Content in Maize Field

为改良土壤结构,提高土壤生物活性,以玉米秸秆不还田为对照(CK),设置秸秆覆盖还田、秸秆旋耕还田和深翻秸秆还田3种方式,测定不同方式对玉米田有机质、养分含量、AM真菌侵染效应及GRSP含量的影响。结果表明:和CK相比,连续2年秸秆还田可提高土壤有机质和养分含量,有利于AM真菌生长代谢及对根系侵染效应的发挥,且3种还田方式中,秸秆深翻还田效果最显著,可使AM真菌对玉米根系的侵染频度提高88.67%;侵染强度提高300.66%;孢子数增加106.67%。

In order to improve soil structure,enhance soil fertility and improve soil biological activity,a locatable experiment was carried out to determine the effects of different methods on organic matter,nutrient content,AM fungi infection and glomalin content in maize field.Taking without maize straw return to field as control(CK),three straw return methods were set up,including straw mulching,spinning straw into the soil and plowing straw deeply into the soil.The results showed that compared with CK,straw return for two consecutive years could increase soil organic matter and nutrient content,which was beneficial to the growth and metabolism of AM fungi and the effect on root infection.Among the three methods of straw return,the effect of plowing straw deeply into the soil was the most significant.The frequency,intensity and spore number of AM fungi under that method increased by 88.67%,300.66%and 106.67%,respectively.