文献类型：期刊文献

中文题名：杉木纯林和混交林土壤温室气体通量的差异

英文题名：Soil greenhouse gas fluxes in pure and mixed stands of Chinese fir

作者：徐睿[1] 姜春前[1] 白彦锋[1] 刘秀红[1] 汪思龙[2]

第一作者：徐睿

机构：[1]中国林业科学研究院林业研究所国家林业和草原局林木培育重点实验室;[2]中国科学院沈阳应用生态研究所

年份：2019

卷号：0

期号：2

起止页码：307-317

中文期刊名：浙江农林大学学报

外文期刊名：Journal of Zhejiang A & F University

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家重点研发计划项目(2017YFC0505604)

语种：中文

中文关键词：森林生态学;杉木纯林;杉木-阔叶树混交林;亚热带森林土壤;二氧化碳(CO2);氧化亚氮(N2O)

外文关键词：forest ecology;pure stands of Chinese fir;mixed stands of Chinese fir;subtropical forest soil;CO2;N2O

分类号：S714

摘要：为了探讨杉木Cunninghamia lanceolata纯林和杉木-阔叶树混交林土壤温室气体通量的差异及其影响因素,采用静态箱-气相色谱法,对杉木纯林及3种杉木-阔叶树混交林(杉木-樟树Cinnamomum camphora混交林、杉木-栲树Castanopsis fargesii混交林、杉木-桤木Alnus cremastogyne混交林)的土壤温室气体通量进行了原位观测。结果表明:杉木纯林土壤二氧化碳(CO_2)的排放通量(490.48 mg·m^(-2)·h^(-1))高于杉木-栲树混交林(254.27 mg·m^(-2)·h^(-1))和杉木-桤木混交林(331.51 mg·m^(-2)·h^(-1)),杉木纯林(32.29μg·m^(-2)·h^(-1))和杉木-桤木混交林(32.24μg·m^(-2)·h^(-1))土壤氧化亚氮(N_2O)的排放通量高于杉木-栲树混交林(2.66μg·m^(-2)·h^(-1))。在杉木-栲树混交林、杉木-桤木混交林和杉木纯林中,土壤二氧化碳排放通量与土壤温度呈线性相关,杉木人工林土壤氧化亚氮排放通量与土壤硝态氮质量分数和土壤孔隙含水量(WFPS)呈极显著相关。回归分析显示:杉木-栲树混交林、杉木-桤木混交林、杉木纯林的土壤氧化亚氮排放通量与土壤WFPS呈指数增长关系, 4种林分中土壤氧化亚氮排放通量与土壤硝态氮质量分数呈线性关系。森林的树种组成对土壤温室气体排放通量有影响。杉木纯林转换为杉木-阔叶树混交林后,土壤二氧化碳排放通量减少。土壤氧化亚氮排放通量的变化来源于样地土壤硝态氮质量分数的变化。
To investigate the differences in soil CO2 and N2O fluxes as well as CO2 and N2O flux factors from Chinese fir(Cunninghamia lanceolata)stands(CL)and mixed stands of Chinese fir and Cinnamomum camphora(CL-CC),Castanopsis fargesii(CL-CF),and Alnus cremastogyne(CL-AC),CO2 and N2O fluxes were quantified with a static chamber-gas chromatography method with 5 replications.Results of one-way ANOVA showed that CO2 fluxes in CL(490.48 mg·m-2·h-1)were significantly higher(P<0.05)than in CL-CF(254.27 mg·m-2·h-1)and CL-AC stands(331.51 mg·m-2·h-1),and N2O fluxes in CL(32.29μg·m-2·h-1)and CL-AC(32.24μg·m-2·h-1)were higher(P<0.05)than in CL-CF(2.66μg·m-2·h-1).In CL-CF,CL-AC,and CL,a linear relationship was observed between CO2 and soil temperature.Also nitrate-N and water filled pore space(WFPS)were significantly correlated with soil N2O flux.In CL-CF,CL-AC,and CL,an exponential relationship was observed between N2O fluxes and WFPS.A linear relationship was also observed between N2O and nitrate-N.Forest species composition,usually considered an important factor influencing CO2 and N2O fluxes,decreased net CO2 emissions with conversion from a pure Chinese fir stand to a mixed Chinese fir stand with differences in soil N2O flux among the stands possibly being attributed to differences in soil NO3-N content.[Ch,7 fig.4 tab.38 ref.].