中文摘要：

本研究采用裂区试验设计,主区设置了3种覆膜方式：露地平播（即常规播种方法,无覆膜）、半覆膜平作（即常规播种方法,覆膜占小区面积一半）、全膜垄上穴播（即起垄后小区全覆膜,垄上播种）,副区设置了2个丛枝菌根（AM）真菌接种水平：接种AM真菌（AM）和不接种对照（CK）,研究了大田条件3种覆膜方式下接种AM真菌对半干旱区春播玉米根际土壤养分、有机碳含量及AM真菌特性（侵染率、根外菌丝密度与土壤球囊霉素）的影响。结果表明：3种覆膜方式下,与不接种对照相比,接种AM真菌显著提高了根系侵染率、根外菌丝密度、土壤中球囊霉素和有机碳含量、植株干重、碳氮比和土壤含水量,同时显著促进了土壤养分吸收（个别例外）,其中土壤根外菌丝密度、易提取球囊霉素、有机碳、速效磷和速效钾含量、碳氮比随着覆膜方式由无覆膜-半覆膜-全覆膜的变化呈降低趋势,而植株干重、土壤中总球囊霉素、全氮和含水量随着覆膜方式由无覆膜-半覆膜-全覆膜的变化呈升高的趋势。全覆膜结合接种AM真菌在促进西北半干旱地区田间作物生长、提高土壤含水量、以及改善菌根侵染率、菌丝密度与土壤中球囊霉素含量的作用最大,但降低了土壤养分,后期还可能需要通过合理施肥措施加以维持土壤肥力水平。相关分析表明,土壤根外菌丝密度和球囊霉素含量与土壤矿质养分和水分存在一定程度的协同效应,接种AM真菌有助于根际土壤养分转化,促进植物生长。

英文摘要：

A split plot field experiment using three modes of plastic film mulching and different AM inoculation treatment was introduced in the study to investigate the effects of plastic film mulching and AM inoculation on soil nutrients, soil organic carbon and mycorrhizal characteristics（e.g. colonization percentage, external hyphal density and glomalin content）. The main plot set three levels： flat planting with non-mulching（NM）, flat planting with half-mulching（HM） and ridge planting with full-mulching（FM）, and the split plot set two levels： AM inoculation（AM） and non-inoculation（CK）. Results showed that inoculation with AM fungi significantly increased root colonization percentage, external hyphal density, plant dry weight, soil glomalin and organic carbon content, C/N ratio and soil water content, and also significantly enhanced the uptake of soil nutrient under three modes of plastic film mulching. The external hyphal density, content of soil easily extractable glomalin（EE-GRSP）, organic carbon, available phosphorus and available potassium, and C/N ratio changed according to different mulching mode and decreased with the trend of non-mulching to half-mulching to full-mulching, while plant dry weight, soil total glomalin（T-GRSP）, total nitrogen and water content increased. The combination application of full-plastic film mulching（FM） and AM inoculation promoted crop growth in semiarid areas of northwest China, and improved soil water content, AM fungal root colonization percentage, external hyphal density and soil glomalin, but decreased soil nutrient, and therefore might need of maintaining fertilization. Correlation analysis showed that the external hyphal density and soil glomalin had a synergistic effect on soil nutrient and water content, and thereby AM inoculation in agricultural ecosystem was beneficial to soil nutrients absorption and plant growth.