不同施肥制度甘蔗地土壤养分对微生物群落结构的影响

The discussion of affecting factors on soil microbial community structure in a sugarcane land under different fertilization treatments

以广西红壤长期定位施肥甘蔗地为研究对象,探讨了不同施肥措施甘蔗地土壤微生物群落特征以及土壤养分对微生物群落结构的影响。结果表明,长期优化施肥可以提高土壤微生物多样性,不施肥土壤微生物生长得到显著抑制。土壤全氮、全钾、速效钾含量与微生物群落结构密切相关,可采取适当增加钾肥用量以增加微生物多样性,提高土壤肥力。土壤中磷素含量与微生物群落结构无显著相关,红壤甘蔗地中磷肥用量应适当,不宜过量施用。

Based on the sugarcane fields of red soil in Guangxi Province, the character of microbial communities and effects of soil nutrients to microbial communities were studied under different fertilization treatments. The results showed that the optimized fertilization could improve soil microbial diversity for a long time and soil microbial growth was significantly suppressed under no fertilizer treatment. The content of total nitrogen, potassium and available potassium was closely related to the microbial community structure. We could appropriately increase the amount of potassium fertilization to stimulate soil microbial diversity and soil fertility. The content of total P was no significantly related to the microbial community structure. Therefore, the amount of phosphorus fertilizer should be applied appropriately in the sugarcane fields, should not be too much.