摘要
采用静态箱-气相色谱法,对西双版纳热带次生林崖豆藤群落中的蚁巢土壤N_(2)O排放通量的季节动态进行定位研究,分析蚂蚁筑巢引起土壤碳氮库及温湿度等土壤性质变化对N_(2)O排放的影响特征。结果表明:蚂蚁筑巢显著影响热带森林土壤N_(2)O排放,蚁巢土壤N_(2)O排放通量(0.67 mg·m^(-2)·h^(-1))显著高于非蚁巢土壤(0.48 mg·m^(-2)·h^(-1)),较非蚁巢土壤增加了40.2%;蚁巢与非蚁巢土壤N_(2)O排放通量具有显著的季节变化,6月分别为0.90和0.83 mg·m^(-2)·h^(-1),显著高于3月(分别为0.38和0.19 mg·m^(-2)·h^(-1));蚂蚁筑巢显著增加了土壤含水率、温度、有机碳、全氮、水解氮、铵态氮、硝态氮和微生物生物量碳,相较于非蚁巢增加了7.1%~74.1%,蚁巢土壤pH相较于非蚁巢土壤降低了9.9%。结构方程结果表明,土壤氮库、碳库和温湿度均对N_(2)O排放通量具有显著促进作用,土壤pH则表现为显著的抑制作用;土壤氮库、碳库、温湿度和pH对N_(2)O排放通量变化的解释量分别为37.2%、27.7%、22.9%和9.4%。蚂蚁筑巢主要通过改变热带次生林土壤硝化与反硝化底物(硝态氮、铵态氮)、碳库含量及微生境(如温湿度)而调控N_(2)O排放动态。
We assessed the seasonal dynamics of N_(2)O emission in ant nests soils in secondary tropical Millettia lep⁃tobotrya forest of Xishuangbanna by using the static chamber⁃gas chromatography method,and determined the lin⁃kages between ant⁃mediated changes in soil properties(e.g.,carbon pool,nitrogen pool,and temperature and humidity)and N_(2)O emission.The results showed that ant nesting significantly affected soil N_(2)O emission.The ave⁃rage soil N_(2)O emission(0.67 mg·m^(-2)·h^(-1))in ant nests was 40.2%higher than that in the control(0.48 mg·m^(-2)·h^(-1)).N_(2)O emission in ant nests and the control showed substantial seasonal variation,with higher rate in June(0.90 and 0.83 mg·m^(-2)·h^(-1),respectively)than that in March(0.38 and 0.19 mg·m^(-2)·h^(-1),respectively).Ant nesting significantly increased the values(7.1%-74.1%)of moisture,temperature,organic carbon,total nitrogen,hydrolytic nitrogen,ammonium nitrogen,nitrate nitrogen,and microbial biomass carbon,but decreased pH(9.9%)compared with the control.Results of structural equation model showed that soil N_(2)O emission was pro⁃moted by soil C and N pool,temperature,and humidity,but was inhibited by soil pH.The explained extents of soil nitrogen pool,carbon pool,temperature and humidity,and pH for N_(2)O emission changes were 37.2%,27.7%,22.9%and 9.4%,respectively.Therefore,ant nesting regulated N_(2)O emission dynamics by changing nitrification and denitrification substrates(e.g.,nitrate and ammoniacal nitrogen),carbon pool,and micro⁃habitat(tempera⁃ture and moisture)of soil in the secondary tropical forest.
作者
张昆凤
王邵军
王平
张路路
樊宇翔
解玲玲
肖博
王郑钧
郭志鹏
ZHANG Kun-feng;WANG Shaojun;WANG Ping;ZHANG Lulu;FAN Yuxiang;XIE Lingling;XIAO Bo;WANG Zhengjun;GUO Zhipeng(College of Ecology and Environment,Southwest Forestry University,Kunming 650000,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2023年第5期1218-1224,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(32271722,32060281)
云南省教育厅科学研究基金项目(2022Y596)资助。
