Effects of Maize and Potato Intercropping on Rhizosphere Microbial Commu-nity Structure and Diversity
Field and pot experiments were conducted with three planting treatments (maize monocropping, potato monocropping, maize, and potato intercropping) to investigate the changes of composition and function diversity of rhizosphere microbial com-munity of maize and potato using Biolog technique. The results indicated that compared with monocropping, the average well color development (AWCD, utilization rate of 31 carbon sources) of rhizosphere microbes of intercropped maize and potato was increased by 17.36%, 7.38% and 3.76%, 32.21% respectively, among the intercropping and monocropping crops, the AWCD value of intercropped potato was the highest and the monocropped maize was the lowest. Functional diversity index of Shannon index (H), Simpson index (D), Evenness index (E), and Richness index (S) were higher in intercropping rhizosphere soil than these in the monocropping systems, but no significant difference. Among six types of carbon sources used by the rhizospheric microbes, carbohydrates, amino acids and carboxylic acids, had higher utilization rates with definite differences. Principal com-ponent analysis (PCA) and cluster analysis demonstrated that the amino acids, carbohydrates and carboxylic acids were the sensi-tive carbon sources for differentiating the changes of the microbial community induced by monocropping and intercropping. This study showed that intercropping can change the composition and enhance functional diversity of the microbial community in the rhizosphere of maize and potato.
国家科技期刊平台
NSTL
万方数据
维普
