The main controlling factors and coupling relationship of functional gene abundance in carbon and nitrogen cycling in dryland red soil with biochar and biogas slurry co-application

为研究生物质炭-沼液配施条件下碳氮生物地球化学循环特征，本研究以典型旱地红壤为对象，按0%和2%生物质炭添加量（C0和C1）与0%和100%沼液替代比例（B0和B1）配施，探究配施条件下4年间土壤基本理化性质、碳-氮循环功能基因丰度变化特征及其相互耦合关系。结果显示：与空白处理（CK）相比，生物质炭与沼液的联合施用处理（C1B1）土壤pH提升了1.92个单位，容重降低了19.2%，全氮含量则提高了268.6%。多元非线性回归模型显示，铵态氮（NH4+-N）、硝态氮（NO3--N）和水溶性有机碳（WSOC）是影响碳氮循环功能基因丰度的主要因子。相关性热图则表明反硝化功能基因（narG、nirK、...

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Published inJournal of agricultural resources and environment Vol. 41; no. 4; p. 835
Main Authors Zheng Yiling, Fan Xumiao, Zhong Zhelun, Yao Guangwei, Chen, Lin, Gu Jiayan, Jin Zewen, Ping Lifeng, Shengdao, Shan
Format Journal Article
LanguageChinese
Published Tianjin Journal of Agricultural Resources and Environment (JARE) 01.01.2024
Subjects
Abundance
Agricultural land
Ammonium
Arid zones
Biogas
Biogeochemical cycles
Bulk density
Carbon
Carbon cycle
Carbon fixation
Charcoal
Coupling
Cycles
Genes
Liquid manure
Nitrates
Nitrogen
Nitrogen cycle
Organic carbon
Physicochemical properties
Regression analysis
Regression models
Slurries
Soil analysis
Soil chemistry
Soil fertility
Soil improvement
Soil investigations
Soil pH
Soil properties
Soil quality
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Summary:为研究生物质炭-沼液配施条件下碳氮生物地球化学循环特征，本研究以典型旱地红壤为对象，按0%和2%生物质炭添加量（C0和C1）与0%和100%沼液替代比例（B0和B1）配施，探究配施条件下4年间土壤基本理化性质、碳-氮循环功能基因丰度变化特征及其相互耦合关系。结果显示：与空白处理（CK）相比，生物质炭与沼液的联合施用处理（C1B1）土壤pH提升了1.92个单位，容重降低了19.2%，全氮含量则提高了268.6%。多元非线性回归模型显示，铵态氮（NH4+-N）、硝态氮（NO3--N）和水溶性有机碳（WSOC）是影响碳氮循环功能基因丰度的主要因子。相关性热图则表明反硝化功能基因（narG、nirK、nirS和nosZ）与碳降解（chiA、pgu、naglu和gcd）、碳固定（rbcL、frdA、pccA和mct）、甲烷代谢功能基因（mxaF和pmoA）呈正相关关系。研究表明，生物质炭与沼液配施显著提升土壤质量，并通过影响土壤碳氮形态和含量改变碳氮循环功能基因丰度，Carbon-nitrogen biogeochemical cycling characteristics under the combined application of biochar and biogas slurry is critical for analyzing the agricultural soil fertility enhancement. The subject of this study was typical upland red soil. Over a four-year field trial, biochar was applied at rates of 0% and 2%（C0 and C1）, in combination with replacing 0% and 100% of liquid slurry（B0 and B1）to investigate changes in soil physicochemical properties, abundance of carbon and nitrogen cycling functional genes, and their coupling relationships. The combined application of biochar and bio
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ISSN:2095-6819
2095-6819
DOI:10.13254/j.jare.2023.0357