| 森林土壤微生物与植物碳源的磷脂脂肪酸及其单体同位素研究 |
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| 引用本文： | 姜懿珊,孙迎韬,张干,罗春玲.森林土壤微生物与植物碳源的磷脂脂肪酸及其单体同位素研究[J].地球化学,2022,51(1):9-18. |
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| 作者姓名： | 姜懿珊 孙迎韬 张干 罗春玲 |
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| 作者单位： | 中国科学院 广州地球化学研究所 有机地球化学国家重点实验室, 广东 广州 510640;武汉科技大学 绿色制造工程研究院, 湖北 武汉 430081;中国科学院大学, 北京 110049;中国科学院 广州地球化学研究所 有机地球化学国家重点实验室, 广东 广州 510640 |
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| 基金项目： | 有机地球化学国家重点实验室开放基金课题(SKLOG202106)资助； |
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| 摘 要： | 森林生态系统的土壤微生物群落组成和活性,是影响生物地球化学循环、有机质代谢和土壤质量的关键因素.磷脂脂肪酸(PLFA)是一类可有效表征活体微生物群落结构的生物标志物,而其单体稳定碳同位素(δ13C)水平对土壤微生物植物碳代谢具有独特的指示作用.本次研究以土壤PLFA为对象,分析了我国位处纬度梯度带上(24°N～47°N...
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| 关 键 词： | 森林土壤微生物 磷脂脂肪酸 单体稳定碳同位素 群落结构 碳源 |
Mountain forest soil microbial communities and carbon source study by phospholipid fatty acid structure and compound-specific isotope analysis |
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| JIANG Yishan,SUN Yingtao,ZHANG Gan,LUO Chunling.Mountain forest soil microbial communities and carbon source study by phospholipid fatty acid structure and compound-specific isotope analysis[J].Geochimica,2022,51(1):9-18. |
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| Authors: | JIANG Yishan SUN Yingtao ZHANG Gan LUO Chunling |
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| Institution: | (State Key Laboratory of Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;Academy of Green Manufacturing Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Soil microbial structures and their activity in forest ecosystems plays a key role in soil biogeochemical cycles,soil organic matter metabolism,and soil quality.Phospholipid fatty acid(PLFA)is a biomarker of living microbial structure,and its natural stable carbon isotope abundance( δ13C)is indicative of the microbial plant carbon sources.In this study,four microbial communities(bacteria,fungi,gram-positive bacteria,and gram-negative bacteria)as well as total microbial biomass,structures,plant carbon sources and their relationship with environmental factors were discussed based on the abundance,composition,and δ13C of their representative PLFA in nine mountain forests distributed on a latitudinal gradient(24°N-47°N)in China.The total microbial biomass(28.2-253μg/g)was significantly different in the nine forests,as was the biomass of the four microbial communities and the ratio of gram-positive bacteria to gram-negative bacteria(GP/GN)(p<0.01).The principal components of PLFA in forests located at relatively high latitudes and low elevations are similar to those in forests located at relatively low latitudes and high elevations,indicating a similar microbial structure in these forests.Soil pH,soil organic carbon(SOC),and total nitrogen(TN)were significantly correlated with soil microbial biomass(p<0.01),while mean annual temperature(MAT),soil temperature,and the ratio of soil carbon and nitrogen were significantly correlated with the soil microbial structure(p<0.01).This indicates that the microbial biomass was mainly influenced by soil properties,but the microbial structure was determined in combination with climatic conditions.The δ13C of soil microbes varied from ?35‰ to ?17‰,which was similar to that of C3 plants,indicating a principal C3 plant microbial carbon source in these forests.There was a significant relationship between the total and the four microbial δ13C values and mean annual temperature,mean annual precipitation,soil organic carbon,and total nitrogen(p<0.05),suggesting that the choice of microbial plant carbon source is influenced by soil fertility and climatic conditions. |
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| Keywords: | forest soil microbes phospholipid fatty acid stable carbon isotope microbial community microbial carbon source |
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