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砂姜黑土有机碳与微生物群落特性之间的关系
李敬王1, 史东梅1, 陈林2, 张佳宝2, 周彦芳3
1.西南大学资源环境学院 重庆;2.中国科学院南京土壤研究所 土壤与农业可持续发展国家重点实验室 南京;3.甘肃省农业工程技术研究院 甘肃省特种药源植物种质创新与安全利用重点实验室 甘肃武威
摘要:
砂姜黑土是我国典型的中低产土壤,提升土壤有机质是砂姜黑土改良的重要环节,然而砂姜黑土有机质与微生物之间的关联关系尚不明确。本文采集40个代表性苏北平原砂姜黑土样品,测定土壤有机碳、全氮、可溶性有机碳、微生物生物量碳氮,利用稳定性同位素13C 标记的谷氨酸测定微生物碳利用率、16S rRNA基因高通量测序分析微生物群落结构,研究苏北平原砂姜黑土有机质及关键微生物的关联关系。结果显示:苏北平原砂姜黑土有机碳含量为15.82 g/kg,可溶性有机碳占土壤有机碳含量的2‰,表明有机质的碳有效性较低;砂姜黑土优势菌门为变形菌门,优势菌科以黄单胞菌科、Gaiellaceae、酸杆菌科细菌为主,但高效的碳转化菌群(如酸杆菌纲和放线菌)较少;微生物碳利用率普遍较低,在0.07 ~ 0.20之间,与有机碳、可溶性有机碳和微生物生物量碳含量显著相关。因此,较低的微生物碳利用率、较低的碳转化菌群组成比例制约了砂姜黑土有机质的形成与提升。
关键词:  砂姜黑土  有机质  13C标记  土壤微生物生物量碳  微生物群落
DOI:10.13758/j.cnki.tr.2019.03.010
分类号:S156; S158
基金项目:国家重点研发计划项目(2016YFD0300802)、国家自然科学基金项目(41807017)、江苏省自然科学基金项目(BK20171106)和小麦产业技术体系项目(CARS-03)资助。
Relationship Between Soil Organic Carbon and Microbial Community in Lime Concrete Black Soil
lijingwang1, shidongmei1, chenlin2, zhangjiabao2, zhouyanfang3
1.College of Resources and Environment, Southwest University;2.Institute of Soil Science, Chinese Academy of Sciences;3.Key Laboratory of the Special medicine Source Plant for Germplasm Innovation and Safety Utilization, Gansu Academy of agri-engineering technology
Abstract:
The lime concrete black soil (LCBS) is a typical soil with low productivity and fertility in China. Increasing soil organic matter is extremely important for the improvement of LCBS, but little is known about the relationship between soil organic matter and microbial community characteristics in the LCBS. Here, we collected 40 LCBS samples in the North Jiangsu Plain, measured soil organic carbon (SOC), total nitrogen (TN), dissolved organic carbon (DOC), microbial biomass carbon (MBC) and microbial carbon use efficiency (CUE), and employed high-throughput sequencing technology to determine the bacterial community structure. The results showed that SOC content in LCBS was 15.82 g/kg, but DOC accounted for a very small fraction of SOC (approximately 2‰), indicating that C availability is low in LCBS. Xanthomonadaceae, Gaiellaceae, and Acidobacteriaceae families dominated soil bacterial community. However, there were low abundance of the bacteria associated with C sequestration such as acidobacteria and actinomycetes. The low CUE (ranged from 0.07 to 0.20) was significantly correlated with SOC and DOC. The results suggested that soil organic matter formation and accumulation are restricted in part by the low carbon use efficiency and poor structure of microbial community in LCBS.
Key words:  Lime concrete black soil  Organic matter  13C labeling  Soil microbial biomass carbon  Microbial community

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