PJB-2017-785
Effects of rice straw and biochar applications on soil microbial community in a solar greenhouse
Yiming Zhang
Abstract
Soil microbial abundance and diversity change constantly in continuous cropping systems, resulting in the prevalence of soil-borne pathogens and a decline in crop yield in solar greenhouses. To investigate the effects of rice straw and biochar on soil microbial abundance and diversity in continuously planted soil, three treatments were examined: mixed rice straw and biochar addition (RC), rice straw addition (R), and biochar (C) addition. The number of C added with each treatment was 1.43 kg per plot. Soil without rice straw and biochar addition was analyzed as a control (CK). Results of this research work revealed that under the RC treatment significantly (P < 0.05) increased soil pH, available nitrogen (AN), available phosphorus (AP) and potassium (AK) than that of CK treatment. Soil labile organic carbon (LOC), including readily oxidizable organic carbon (ROC), dissolved organic carbon (DOC) and light fraction organic carbon, was significantly higher in the RC, R and C treatments than that of CK treatment. Under the RC treatment significantly produced (P < 0.05) higher organic carbon levels as compared with rest of treatments. Both rice straw and biochar addition significantly (P < 0.05) increased bacterial and total microbial abundance, whereas rice straw but not biochar addition improved soil microbial activity and diversity. Thus, the significant effects of rice straw and biochar on soil microbial activity and diversity were attributed to the quantity of DOC in the treatments. Therefore, our results indicated that soil microbial diversity is directly associated with DOC. Mixed rice straw and biochar addition, rather than their sole addition, might be superior to restore degraded soil based on the results of the present study.
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