[Effects of Straw Biochar on Soil Microbial Metabolism and Bacterial Community Composition in Drip-irrigated Cotton Field].

A five year field experiment was conducted to evaluate the effect of continually returning cotton straw or biochar on microbial metabolic function and bacterial community composition of soil in a cotton field under drip irrigation conditions. The experiment involved three treatments:control (single application of chemical fertilizer, CK), cotton straw (returning of cotton straw plus chemical fertilizer application, ST), and biochar (returning of cotton straw biochar plus chemical fertilizer application, BC). The returning of cotton straw and biochar both significantly increased soil organic matter, total nitrogen, and available nutrients, but the effect of returning biochar was more significant.