Synergistic effects of biochar and nitrogen fertilizer enhance soil carbon emissions and microbial diversity in acidic orchard soils.

Compared with CK, SOC, POC and MAOC contents of B1 and B3 were significantly increased by 2.06 and 3.88 g kg −1 , 0.77 and 1.77 g kg −1 , 1.37 and 3.17 g kg −1 , respectively, showing an increasing trend with higher application rates ( P < 0.05 ).

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Both Streptomyces and Streptacidiphilus exhibited a decreasing trend with increasing biochar application rates, with reductions ranging from 1.37% to 9.39% and 1.26% to 10.96%, respectively.

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