The Impact of AM Fungi and Phosphorus on Glomalin-related Soil Protein and Growth of Maizein a Coal-mining Induced Subsidized Area
Coal mining could result inland subsidence,leading to a deterioration in soil structures and decrease in soil fertility,hindering nutrient uptake and crop growth.Arbuscular mycorrhizal fungi (AMF) has special physiological functions in rehabilitating degraded agroforestry ecosystems and increasing crop growth,especially phosphorus (P) uptake.This paper presents the results of a greenhouse experiment in attempts to study the changes in glomalin-related soil protein (GRSP),maize growth and P uptake in a coal-mining induced subsided area underfour P application rates (0,25,50 and 100 mg/kg) with the soil inoculated either by Glomus mosseae (single inoculation)or by Glomus etunicatum and Glomus mosseae (double inoculation).The results showed AMF inoculation,P addition and the interaction between AMF and P had a significant impact on AMF abundance,plant height and stem diameter,as well as the easy-to-extract glomalin-related soil protein (EE-GRSP) content (P＜0.05).The AMF abundance was between 0.29％ and 25.22％,with the abundance under double inoculation significantly higher than that under single inoculation (P＜0.05) at the same P level.The relationship between AM abundance and GRSP content was found to be quadratic,and at the same P level the total glomalin-related soil protein (TGRSP) and EE-GRSP were in the order of double inoculated ≥ single inoculated ＞ non-inoculated.With the increase in P,the GRSP content increased first and then decreased with the AMF inoculation.Compared with noninoculation,plant height,stem diameter,dry-weight of the shoot,as well as the P uptake remained almost unchanged under the single inoculation,while increased significantly under the double inoculation at the same P level.Also,under the four treatments with double inoculation,the plant height and P uptake at P additions of 50 and 100 mg/kg were significantly higher than that at the additions of 0 and 25 mg/kg.The AM abundance correlated positively with GRSP content,plant height,stem diameter and shoot P content.
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