Effects of Excessive Fertilization on Microorganism Diversity in Soil.

Revealing the relationship between excessive fertilization and soil microorganism diversity plays an important role in improving agricultural economic and ecological benefits. The soil without fertilization, reasonable fertilization and over fertilization for a long time were used as test materials to determine the diversity of microorganism after incubation. Shannon index was used to measure the number of microorganism species and individuals in soil and the evenness of their distribution. Excessive fertilization resulted in an obvious increase in Shannon index, indicating that excessive fertilization would lead to a decrease in the number of microorganisms in soil. The McIntonch index was used to evaluate the index of microorganism homogeneity. Excessive fertilization resulted in a significantly higher McIntonch index, indicating that excessive fertilization would lead to a single microorganism species in the soil. There were significant differences in microorganism diversity in soil with different degrees of fertilization, especially in the case of excessive fertilization, microorganism diversity in soil decreased significantly on the whole. This indicated that excessive fertilization would adversely affect the microorganism diversity in soil. [ABSTRACT FROM AUTHOR]