生态学杂志2025，Vol.44Issue(8)：2497-2505,9.DOI:10.13292/j.1000-4890.202508.013
外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响
Impacts of exogenous organic carbon input and soil properties on priming effect in coastal wetlands of Yellow River Delta,China
摘要
Abstract
Exogenous carbon input may either increase or decrease soil organic carbon(SOC)mineralization,re-sulting in a positive or negative priming effect,respectively,with consequence on soil carbon storage and stability.However,how differences in exogenous carbon input levels and soil properties affect the direction and intensity of the priming effect remains unknown.In this study,we collected soil samples from two coastal wetlands(new and old river channels)in the Yellow River Delta with different soil physicochemical properties,and conducted an incu-bation experiment to test the effects of different levels of isotope-labeled glucose addition(0.2％,0.5％and 2％of SOC)on the priming effect of soil carbon mineralization.The results showed that the 0.2％and 0.5％treatments led to a positive priming effect,whereas the 2％treatment significantly inhibited native SOC mineralization and pro-duced a negative priming effect.There was a significant interaction between wetland type and glucose addition level on the priming effect.There was no significant difference in the priming effect of the two wetlands under the 0.2％and 0.5％treatments.Soil from the old channel wetland produced a stronger negative priming effect than that in the new channel wetland under the 2％treatment.The priming effect was negatively correlated with microbial biomass carbon,suggesting that the differences in soil physicochemical properties,including soil texture,nutrient and or-ganic carbon content,affected soil microbial biomass and activity,thus regulating the response of priming effect to exogenous carbon inputs.Overall,our results suggest that exogenous carbon addition levels and soil physicochemi-cal properties co-regulate the direction and intensity of the priming effect in the coastal wetlands,with important consequence on soil carbon cycle of coastal wetlands.This study provides a scientific basis for understanding soil carbon stability in coastal wetlands.关键词
土壤有机碳/激发效应/葡萄糖添加/碳同位素/滨海湿地Key words
soil organic carbon/priming effect/glucose addition/carbon isotope/coastal wetland引用本文复制引用
胡聪月,张亚茹,韩村,李培广,韩广轩,宋维民..外源物添加量和土壤性质对黄河三角洲滨海湿地土壤激发效应的影响[J].生态学杂志,2025,44(8):2497-2505,9.基金项目
国家重点研发计划项目(2022YFC3105402)、国家自然科学基金委员会-山东联合基金项目(U1906220)、国家自然科学基金项目(41706097)资助. （2022YFC3105402）
