CAJ | 학술논문

全球温带森林土壤是影响陆地主要温室气体--二氧化碳（CO2）、甲烷（CH4）和氧化亚氮（N2O）的重要源和汇，土壤温湿度的交互作用是影响温室气体吸收与释放的重要影响因素，但目前针对温带森林土壤的温湿度变化对温室气体的影响研究甚少。本研究用自动控制温湿度的人工气候箱模拟不同温度（5、10、15℃）和土壤水分含量（最大田间持水量的20%、40%、60%、80%）环境，比较研究3种我国温带典型森林土壤CO2、N2O、CH4的通量动态变化及其综合增温潜势（GWP）。结果表明：温度和土壤含水量增加会导致3种森林土壤的CO2和N2O表现为排放源、CH4为弱吸收汇。其中，阔叶林和针叶林土壤CO2排放通量变化幅度相近，针阔混交林的排放通量波动范围较小于二者；针阔混交林和阔叶林土壤的N2O排放通量变化幅度相近，而针叶林土壤的排放通量波动范围明显高于二者；阔叶林土壤 CH4吸收通量随温度和土壤含水量增加的幅度较其他2种林型显著。3种林型土壤GWP受温度和土壤含水量影响的敏感性由高到低依次为阔叶林＞针叶林＞针阔混交林。
전구온대삼림토양시영향륙지주요온실기체--이양화탄（CO2）、갑완（CH4）화양화아담（N2O）적중요원화회，토양온습도적교호작용시영향온실기체흡수여석방적중요영향인소，단목전침대온대삼림토양적온습도변화대온실기체적영향연구심소。본연구용자동공제온습도적인공기후상모의불동온도（5、10、15℃）화토양수분함량（최대전간지수량적20%、40%、60%、80%）배경，비교연구3충아국온대전형삼림토양CO2、N2O、CH4적통량동태변화급기종합증온잠세（GWP）。결과표명：온도화토양함수량증가회도치3충삼림토양적CO2화N2O표현위배방원、CH4위약흡수회。기중，활협림화침협림토양CO2배방통량변화폭도상근，침활혼교림적배방통량파동범위교소우이자；침활혼교림화활협림토양적N2O배방통량변화폭도상근，이침협림토양적배방통량파동범위명현고우이자；활협림토양 CH4흡수통량수온도화토양함수량증가적폭도교기타2충림형현저。3충림형토양GWP수온도화토양함수량영향적민감성유고도저의차위활협림＞침협림＞침활혼교림。
Global temperate forest soil has a significant influence on main greenhouse gas such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) source and sink. Interaction of soil temperature and humidity has been an important environmental effecting element. However, fluxes variation of these trace gases in temperate forest soil have been scarcely quantified with condition of soil temperature and humidity interacting. In this study, we investigated variation and global warming potential of soil CO2, CH4 and N2O fluxes of undisturbed woodland soil including coniferous forest, broad-leaved forest, coniferous and broad-leaved mixed forest in temperate region of China. The soil samples put in the controlled chambers were dealt with different soil water contents as 20%, 40%, 60%, and temperatures as 5 ℃, 10 ℃ and 15 ℃. The results shows that all the treatments result in carbon emission source of CO2, N2O and light carbon sink of CH4 to 3 kinds of temperate forest soil. Among of them, CO2 flux of coniferous forest and broad-leaved forest soil has a similar variation, which is a little lower than that of coniferous and broad-leaved mixed forest. N2O emission flux of broad-leaved forest and mixed forest was close, but which is higher than that of coniferous forest. With the increase of temperature and soil moisture content, absorbed flux of CH4 in broad-leaved forest soil higher than others. The sensitivity of global warming potential of 3 forest soils in different temperature and soil water content from high to low is broad-leaved forest, coniferous forest, coniferous and broad-leaved forest.