Effects of plastic film mulching and inoculation with AM fungi on soil physicochemical properties of maize rhizosphere in semiarid areas
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.
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万方数据
维普
