氮沉降背景下土壤动物马陆对温室气体排放的调节作用  

The regulating effect of millipedes on soil greenhouse gas emissions under the background of nitrogen deposition

作　　者：李媛媛 刘兴婕[1] 陈月琴 张娜[1] 任源浩 阮宏华 LI Yuanyuan;LIU Xingjie;CHEN Yueqin;ZHANG Na;REN Yuanhao;RUAN Honghua(School of Food Science,Nanjing Xiaozhuang University,Nanjing 211171,China;Department of Ecology,Nanjing Forestry University,Co-Innovation Center for the Sustainable Forestry in Southern China,Nanjing 210037,China)

机构地区：[1]南京晓庄学院食品科学学院,南京211171 [2]南京林业大学生态学系,南方林业协同创新中心,南京210037

出　　处：《生态学杂志》2025年第3期962-967,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(32101339和32071594);江苏省生态学重点学科项目(苏教研函[2022]2号)资助。

摘　　要：大气氮沉降增加是全球变化最重要特征之一,其对陆地生态系统结构和功能的影响是目前生态学领域关注的热点问题。作为土壤生态系统的重要组成成分,大型土壤动物通过取食、挖穴及排泄活动影响土壤物理、化学和生物学性质等,进而影响土壤生态系统的功能。然而,在氮沉降背景下,土壤大型动物如何影响土壤温室气体排放还不清楚。本研究设置了一套微宇宙室内实验,包括两个氮添加处理(N0:无氮添加,N+:添加氮)和土壤动物(无动物,马陆),探讨土壤温室气体CO_(2)、N2O和CH4的排放以及土壤主要环境因子的变化。结果表明:马陆和氮添加的交互效应显著影响土壤CO_(2)排放。没有马陆,氮添加增加了19.4%的土壤CO_(2)排放;有马陆,氮添加降低7.0%的土壤CO_(2)排放。氮添加比没有氮添加增加了206.6%N2O排放,但这种趋势在马陆存在时有所降低。马陆处理显著增加CH4排放。相关分析表明,土壤CO_(2)排放与土壤微生物生物量碳、土壤可溶性有机氮和铵态氮显著相关;土壤N2O排放与总溶解氮、有效氮和可溶性有机碳氮相关;土壤CH4排放与总溶解氮和碳氮比相关。本研究表明,马陆减弱了氮沉降导致的森林土壤CO_(2)和N2O的排放。Atmospheric nitrogen(N)deposition plays an important role in soil greenhouse gas(GHG)emissions.Soil macrofauna activities of feeding,burrowing,and casting affect the biological,chemical,and physical properties of soil.However,the role of soil macrofauna on GHGs under N deposition is not well known.Here,we conducted a microcosm experiment involving two levels of N addition(N0:without N;N+:N addition)and fauna(no fauna and with millipedes).We measured CO_(2),N2O,CH4 emissions,and soil properties.Millipede and N addition interactively impacted soil CO_(2)emission.N addition increased soil CO_(2)emission by 19.4%without millipede,but decreased it by 7.0%with millipede.N addition increased soil N2O emission by 206.6%,and the presence of millipede weakened this effect.Millipede significantly increased soil CH4 emission.Soil CO_(2)emission had a correlation with soil MBC,DON and NH4+-N;soil N2O emission was correlated with soil DON,soil available N and DOC;soil CH4 emission was correlated with TDN and C/N.Our results highlight the importance of millipedes in regulating soil GHGs emission under N addition.

关 键 词：土壤动物 土壤生态系统 微生物生物量碳 可溶性有机氮 

分 类 号：S154.5[农业科学—土壤学]