摘要
微生物碳源利用效率(CUE)是指微生物将吸收的碳(C)转化为自身生物量C的效率,土壤微生物CUE的研究对深入认识土壤C循环过程十分重要.利用^(18)O-H_(2)O-DNA标记法,研究戴云山不同海拔(980~1765 m)天然林土壤微生物CUE、微生物生长速率(C_(growth))和呼吸速率(C_(respiration))的变化特征和影响机制.结果表明,微生物CUE在0.1~0.4之间变化,并随海拔升高而增加;微生物CUE与C_(growth)、C_(respiration)和单位微生物生长正相关,而与呼吸熵负相关,说明随海拔的增加,微生物通过增加个体生长和抑制个体呼吸来提高CUE;温度是影响CUE的主要因素,微生物CUE与温度负相关,说明随海拔增加,温度下降是促进土壤微生物CUE升高的关键因素.
Microbial carbon use efficiency(CUE) refers to the C transformation to microbial biomass from C uptake.The study of soil microbial CUE is very important for understanding the soil C cycle.Here,CUE,C_(growth),and C_(respiration) were measured using the ^(18)O-H_(2)O-DNA labeling method at six elevational sites(980-1 765 m) in Daiyun Mountain,a subtropical montane forest,to understand the variation characteristics and influencing mechanisms.The results showed that:CUE varied from 0.1 to 0.4 and increased linearly with elevation;CUE was positively correlated with C_(growth),C_(respiration),and q_(growth) but negatively correlated with qCO_(2),indicating that CUE increased with elevation by increasing microbial growth and inhibiting respiration;and temperature was the first controlling factor for the elevation variation in microbial CUE in the subtropical forest ecosystem.
作者
吕坤
王晶晶
吴国朋
林思诺
苏延桂
黄刚
Lü Kun;WANG Jing-jing;WU Guo-peng;LIN Si-nuo;SU Yan-gui;HUANG Gang(Institute of Geography,Fujian Normal University,Fuzhou 350007,China;Key Laboratory for Humid Sub-tropical Eco-Geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350007,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2022年第8期4364-4371,共8页
Environmental Science
基金
国家自然科学基金项目(41671115,32171643)
NSFC-新疆联合基金项目(U1703332)。
关键词
温度
土壤元素计量比
土壤-微生物计量不平衡
亚热带
山地森林
temperature
soil element stoichiometric ratio
soil-microbial stoichiometric imbalance
subtropical region
montane forest
