应用生态学报2024，Vol.35Issue(8)：2025-2034,10.DOI:10.13287/j.1001-9332.202408.008
碳氮有效性对亚热带人工林土壤微生物呼吸及其代谢响应的影响
Effects of carbon and nitrogen availability on soil microbial respiration and its metabolic response in sub-tropical plantations
摘要
Abstract
We examined the metabolic response of microbial respiration to glucose addition with the topsoil(0-10 cm)from five plantation types,including Quercus glauca,Castanopsis kawakamii,Pinus massoniana,Phoebe bournei,and Cinnamomum camphora plantations,in the Sanming Forest Ecosystem National Field Observation and Research Station in Fujian Province.The results showed that glucose addition significantly increased microbial res-piration by 82.4％-349.5％,with significant difference among tree species.In the control,microbial respiration significantly correlated with microbial biomass carbon,soil organic carbon,and the fungi/bacteria ratio,indicating that microbial metabolism was regulated by soil organic carbon content and was associated with microbial biomass and community structure in the absence of labile carbon supply.In the glucose addition treatment,microbial respi-ration positively correlated with soil total nitrogen,dissolved organic nitrogen,and mineral nitrogen,indicating that microbial metabolism was mainly constrained by soil nitrogen content and its availability in the presence of adequate labile carbon supply.The metabolic response of microbial respiration,as indicated by the ratio of microbial respira-tion in the glucose addition treatment to that in the control,was primarily affected by soil carbon/nitrogen ratio,with a decrease in the ratio leading to an increase in the microbial metabolic response.Additionally,soil pH played an important role in mediating microbial metabolic response.The effect of the content and availability of soil carbon and nitrogen on microbial respiration depended on whether microbes were carbon-limited.Soil carbon content media-ted microbial respiration when microbes were carbon-limited,whereas soil nitrogen content and availability media-ted microbial respiration after the alleviation of microbial carbon limitation.关键词
碳限制/化学计量学/外源活性碳输入/微生物群落结构/异养呼吸Key words
carbon limitation/stoichiometry/exogenous labile C input/microbial community structure/hetero-trophic respiration引用本文复制引用
高红,王小红,吴东梅,范爱连,贾林巧,姚晓东,陈光水..碳氮有效性对亚热带人工林土壤微生物呼吸及其代谢响应的影响[J].应用生态学报,2024,35(8):2025-2034,10.基金项目
本文由国家重点研发计划项目(2021YFD2200403)和国家自然科学青年基金项目(32301560)资助. （2021YFD2200403）
