山东农业大学学报（自然科学版）2025，Vol.56Issue(3)：396-406,11.DOI:10.3969/j.issn.1000-2324.2025.03.003
外源底物输入对滨海盐渍土有机碳矿化的影响
Exogenous Substrate Input on Organic Carbon Mineralization in Coastal Saline Soils
摘要
Abstract
Coastal saline soils serve as critical reserve land resources with significant carbon sequestration potential.Soil organic carbon(SOC)mineralization is a primary process driving soil carbon emissions,while exogenous substrate inputs regulate SOC dynamics by altering soil microbial growth and metabolic activities.However,the effects of these inputs on SOC mineralization in coastal saline soils remain poorly understood.This study examines three saline soils with distinct salinity levels in the Yellow River Delta,applying six treatments:light saline soil+straw(SL),moderate saline soil+straw(SM),heavy saline soil+straw(SH),light saline soil+straw+ammonium nitrate(SNL),moderate saline soil+straw+ammonium nitrate(SNM),and heavy saline soil+straw+ammonium nitrate(SNH).The influence of exogenous substrate inputs on organic carbon mineralization in coastal saline soils is investigated.The main research results are as follows:Straw addition increases SOC to varying degrees.In the treatment of straw combined with ammonium nitrate,SOC content declines significantly during incubation,with SNL,SNM,and SNH decreases by 20.48%,29.16%,and 27.35%,respectively.The combined application of straw and ammonium nitrate significantly increases soil respiration rate compared to straw application alone,with the most pronounced enhancement observed in heavy saline soil.Notably,the respiratory rate in heavy saline soil surpasses those of light and moderate saline soils during the later stages of incubation.Among the three types of coastal saline soils,the combined application consistently produces the most significant increases in soil enzyme activity,thereby accelerating carbon cycling in saline soils.While straw input enhances organic carbon content in coastal saline soils to varying degrees,the combined application of straw and ammonium nitrate accelerate organic carbon mineralization through increased respiration rates and enzyme activities.This leads to a decrease in organic carbon content during the incubation period,with this phenomenon being particularly evident in heavy saline soils.关键词
土壤盐渍化/碳循环/土壤呼吸/土壤胞外酶活性Key words
Soil salinization/carbon cycle/soil respiration/soil extracellular enzyme activity分类
农业科技引用本文复制引用
霍英东,陈恩涛,谷停停,董小涵,胡国庆..外源底物输入对滨海盐渍土有机碳矿化的影响[J].山东农业大学学报（自然科学版）,2025,56(3):396-406,11.基金项目
国家自然科学基金面上项目(42377313) （42377313）
山东省自然科学基金面上项目(ZR2022MD093) （ZR2022MD093）
山东省重点研发计划项目(2021CXGC010801) （2021CXGC010801）
山东省高等学校大学生创新训练计划项目(202410434009) （202410434009）
