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不同利用方式红壤反硝化势和气态产物排放特征
ZULKARNAEN Nanang,程 谊,张金波
1.南京师范大学地理科学学院;2.江苏省地理环境演化国家重点实验室培育建设点;3.江苏省地理信息资源开发与利用协同创新中心;4.南京师范大学虚拟地理环境教育部重点实验室
摘要:
采用厌氧培养-乙炔抑制法测定了4种不同利用方式红壤的反硝化势和气态产物N2O和N2的排放速率。结果表明,不同利用方式红壤反硝化势和N2O和N2的排放速率差异明显,土壤反硝化势强弱顺序依次为:竹林>茶园>林地>旱地。反硝化势与土壤有机碳(P<0.05)、厌氧培养期间土壤CO2累积排放量(P<0.01)、nirS基因丰度( P<0.05)和nirK基因丰度(P<0.05) 呈显著正相关关系。逐步回归分析结果表明,CO2累积排放量表征的易矿化碳是造成不同利用方式红壤反硝化势差异的主要原因,可以解释反硝化势变化的66%(P<0.01)。不同利用方式红壤N2O和N2排放速率差异明显,旱地红壤N2O和N2排放速率均最低,表明土壤pH的提升并没有增加旱地红壤的反硝化损失风险和N2O排放速率。土壤易矿化有机碳含量也是影响不同利用方式红壤N2O和N2排放速率的主要因素。反硝化功能基因nirS、nirK和nosZ的丰度均与CO2累积排放量呈显著正相关关系,进一步支持了土壤易矿化有机碳含量是影响不同利用方式红壤反硝化势和气态产物排放的主要因子。土壤pH是影响不同利用方式红壤反硝化气态产物N2/N2O的主要因素,但是pH影响红壤N2/N2O的微生物机制仍需要进一步研究。
关键词:  酸红壤  反硝化势  N2O排放速率  N2排放速率  利用方式
DOI:10.13758/j.cnki.tr.2020.02.018
分类号:S151.9
基金项目:江苏高校优势学科建设工程资助项目(164320H116)资助。
Denitrification Potential and Gas Emission in Red Soils Under Different Land Use Types
ZULKARNAEN Nanang1,2,3,4, CHENG Yi5, Zhang Jinbo5
1 School of Geography Science, Nanjing Normal University, Nanjing 210023, China;2 State Key Laboratory Cultivation Base of Geographical Environment Evolution, Nanjing 210023, China;3 Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;4 Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China;5.School of Geography Sciences,Nanjing Normal University
Abstract:
In this study, soil samples were collected from four land use types, i.e. forest (F), bamboo (B), tea plantation (TP) and upland (U), and the denitrification potential and N2O and N2 emission were determined by using an anaerobic incubation method. The results showed that there were significant differences in the potential denitrification in soils under different land use types. The denitrification potential was in the following order: B > TP > F > U. The denitrification potential was significantly positively correlated with SOC (P<0.05), CO2 emission (P<0.01), nirS (P<0.05) and nirK (P<0.05). The stepwise regression analysis showed that the mineralized C was the key factor controlling the denitrification potential, which could explain 66% of variation of the denitrification potential in soils under different land use types. The differences in N2O and N2 emission were also significant in soils under different land use types, the lowest N2O and N2 emission were observed in soil of upland, indicating the enhancing pH did not increase the potential N loss via denitrification and N2O emission. The mineralized C was also the key factor controlling N2O and N2 emission in soils under different land use types. The significant relationship between nirS, nirK, nosZ and the mineralized C further supported our conclusions. Soil pH was the key factor regulating the ratio of N2/N2O, but the mechanisms of pH regulating the ratio of N2/N2O need further study.
Key words:  Red soil  Denitrification potential  N2O emission  N2 emission  Land use type

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