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Bai ChunMing; He XueLi; Shan BaoQin; Zhao LiLi. 2009. Study on relationships between arbuscular mycorrhizal fungi and soil enzyme activities of Astragalus adsurgens in the desert. Journal of Northwest A & F University - Natural Science Edition. 37(1):84-90. Address: No Address
Objective: This paper assessed the influences of arbuscular mycorrhizal (AM) fungi on the host plant and compared the response of AM fungi to soil enzymes, i. e. urease, protease and acid phosphatase, and soil factors through analysing desert soil samples. Method: Soil samples in the rhizosphere of Astragalus adsurgens were collected in 4 replicates and divided a depth of 50 cm into 5 sections, i. e. 0-10, 10-20, 20-30, 30-40 and 40-50 cm. The author studied 4 sites: Jingbian (Shaanxi), Yanchi (Ningxia), Baotou (Inner Mongol), and Jining (Inner Mongol). With the samples of the roots, the distributions of AM fungi were observed and the relationships with soil enzymes were analyzed. Result: The results showed that AM fungi and soil enzymes had salience correlations. AM fungal colonization and spore density had a similar dynamic variation which declined with soil depth. The spore density from Jining was the highest of all of the samples, just as the vesicular colonization of Jingbian was higher than that of other samples. Arbuscular colonization from the samples of Baotou, as well as the hyphal and total colonization, was much higher than that of other areas. But between the spore density and colonization, there was not enough correlation. Furthermore, higher soil acid phosphatase and soil urease tended to be correlated with higher spore density. Soil urease and protease might have a significant effect on arbuscular colonization. Soil protease also had a positive correlation with hyphal and total colonization. Different from other colonization, vesicular colonization had a negative correlation with soil protease. In contrast, available N and available P had a positive correlation with soil enzymes. Conclusion: The results also advised that soil enzymic activities were strongly correlated to AM fungi in desert ecosystem, and that the soil spore density and the distribution of AM fungal colonization were useful indicators for the building and perfecting of index evaluation system of desert soil ecosystem.
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