生物质碳对设施西芹根际微生物及土壤酶活性的影响

Effect of biochar on rhizosphere microorganisms and soil enzyme activity of western celery in greenhouse

施用生物质炭是提高作物产量和改善土壤质量的有效措施。研究了不同用量的生物质炭对宁夏设施土壤微生物环境及酶活性的影响,结果表明:生物质炭能增加土壤中细菌、真菌和放线菌、微生物量N、C的含量,且在西芹定植期反应敏感,比较定植时期各指标隶属函数发现,TR2生物炭用量在西芹定植时期优化土壤环境效果最佳,利于西芹的生长,因而产量最高;西芹收获时,各处理的隶属函数值均高于对照,以TR5土壤综合理化性状更优,但TR5在苗期综合表现不佳,产量较低,说明高用量的生物炭在使用初期或有抑制作用,因此在宁夏设施中使用生物质炭建议用量为4 500~6 750 kg/hm^2。

Abstract： Application of biochar has an important role in improvement of crop yield and soil quality. The effects of biochar on soil microorganisms environment and soil enzyme in Ningxia greenhouse were investigated by appling different amounts of biochar, for providing a scientific basis for the addition of biochar in greenhouse soil. Results showed that the bacteria, fungi and aetinomyeetes, the content of microbial biomass N and microbial biomass C in soil increased by bioehar. Different indicators were affected by the amount of biochar, which were sensitive during the transplanting date of western celery. The membership functions of different indicators were compared. In TR2 treatment, the optimization results of soil environment were the best, and the production of western celery were the highest. The membership functions of different conducts were higher than that of the control, when the western celery were harvested. The comprehensive physical and chemical characters of soil were better in TR5 treatment, but the comprehensive representation was not good enough and the production increase were lower. The high amount of biochar might have hibitory effect of cope at the beginning, so the recommended amount of biochar was 4 500 kg/hm2-6 750 kg/hm2 in Ningxia greenhouse.