摘要
[目的]长三角地区森林覆盖率达33.4%,其下垫面土壤对区域温室气体的收支平衡具有重要影响。为探讨该地区森林生态系统土壤CH_(4)和N_(2)O通量变化特征及土壤理化性质和凋落物对该2种温室气体通量的影响。[方法]以浙江省杭州市典型阔叶林地土壤为研究对象,于2022年11月至2023年11月采用静态箱-气相色谱法对土壤-大气界面的CH_(4)和N_(2)O通量进行原位观测。[结果]去除凋落物(S)和保留凋落物(SL)处理下CH_(4)年平均吸收通量分别为(47.82±18.54),(36.80±13.55)μg/(m^(2)·h),N_(2)O年平均排放通量分别为(80.74±45.24),(52.70±25.98)μg/(m^(2)·h)。S和SL处理下CH_(4)吸收通量的季节变化趋势相似,春夏2季的吸收通量高于秋冬2季。2种处理下N_(2)O排放通量也呈现出一致的季节变化规律,夏季排放通量最高,春季次之,秋冬2季较低。凋落物对土壤CH_(4)吸收和N_(2)O的排放有显著影响,去除凋落物处理使得土壤CH_(4)年平均吸收通量提高29.9%,土壤N_(2)O年平均排放通量提高53.2%。相关性分析表明,2种处理下的CH_(4)吸收通量与N_(2)O排放通量分别与土壤有机碳含量和土壤温度呈显著正相关(p<0.05)。SL处理下CH_(4)吸收通量与土壤质量密度呈显著负相关(p<0.05)。[结论]阔叶林地在森林碳汇方面发挥着重要作用,阔叶林地土壤凋落物管理对平衡CH_(4)吸收与N_(2)O排放,减缓气候变暖至关重要。
[Objective]The forest coverage rate in the Yangtze River Delta region reaches 33.4%,and the underlying surface soil may have an important impact on the regional greenhouse gas budget.To explore the characteristics of changes in CH_(4)and N_(2)O fluxes in the forest ecosystem soil in this region,as well as the effects of soil physicochemical properties and litter on these two greenhouse gas fluxes.[Methods]Taking the typical broad-leaved forest soil in Hangzhou,Zhejiang Province as the research object,soil-air interface CH_(4)and N_(2)O fluxes were continuously measured from November 2022 to November 2023 by the static chamber-gas chromatography method.[Results]The average annual absorption fluxes of CH_(4)in the soil without litter(S)and soil with litter(SL)treatments were(47.82±18.54),(36.80±13.55)μg/(m^(2)·h),as well as the average emission fluxes of N_(2)O were(80.74±45.24),(52.70±25.98)μg/(m^(2)·h),respectively.The seasonal variations of CH_(4)absorption fluxes were similar under the two treatments of S and SL,with the absorption flux in spring and summer being higher than that in autumn and winter.The N_(2)O emission fluxes of the two treatments also showed similar seasonal variations,with the highest in summer,followed by spring,and lower in autumn and winter.Litter had a significant impact on CH_(4)absorption and N_(2)O emissions,with litter remove leading to a 29.9%increase in CH_(4)influx and a 53.2%increase in N_(2)O efflux.Correlation analysis revealed that the CH_(4)absorption flux and N_(2)O emission flux under the two treatments were significantly positively correlated with soil organic carbon content and soil temperature,respectively(p<0.05).The CH_(4)absorption flux had a significant negative correlation with soil bulk density under SL treatment(p<0.05).[Conclusion]The research results indicate that broad-leaved forests have an important role in forest carbon sinks,and the management of soil litter in broad-leaved forest is crucial for balancing CH_(4)absorption and N_(2)O emissions,as well as mitigating climate warming.
作者
贾沁琦
徐飞
陈炳江
鲁嫣然
陈丽涵
胡嘉豪
郭娜
方双喜
JIA Qinqi;XU Fei;CHEN Bingjiang;LU Yanran;CHEN Lihan;HU Jiahao;GUO Na;FANG Shuangxi(School of Environment,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Carbon Neutral Innovation Institute,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《水土保持学报》
CSCD
北大核心
2024年第6期195-202,共8页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2023YFC2305205)
国家自然科学基金项目(42275113)。
作者简介
第一作者:贾沁琦(2000-),男,硕士研究生,主要从事大气温室气体相关监测研究。E-mail:221122270149@zjut.edu.cn;通信作者:方双喜(1979-),男,教授,博导,主要从事温室气体及相关微量成分监测技术集成开发及观测研究。E-mail:fangsx@zjut.edu.cn。
