The α-diversity analysis (Shannon and Chao 1 indexes) showed that the Chao index showed a trend of ND>NTS>GX in monoculture and NTS>ND>GX in intercropping; the Shannon diversity index in monoculture showed the trend NTS>ND>GX, and in intercropping, it showed NTS>GX>ND ( Table 1 ).
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Relay intercropped soybean promotes nodules development and nitrogen fixation by root exudates deposition.
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