天目山常绿落叶阔叶混交林土壤温室气体排放特点  

The characteristics of greenhouse gas emission in the mixed broadleaved evergreen and deciduous forest in Tianmu Mountain soil

作　　者：孙文文[1] 江洪[1,2,3] 陈晓峰[1] 舒海燕[3] 朱靖[4] 张晓山[4] 

机构地区：[1]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,杭州311300 [2]南京大学国际地球系统科学研究所,南京210093 [3]西南大学三峡库区生态环境教育部重点实验室,重庆400715 [4]中国科学院生态环境研究中心,北京100085

出　　处：《生态科学》2016年第5期65-72,共8页Ecological Science

基　　金：国家自然科学基金资助项目(41171324);中科院-挪威研究理事会合作项目(RCN.proj.no.209696/E10;中科院GBHZ1205);国家林业局森林生态系统定位站研究网络天目山定位站建设和运行项目(102/2045210480)

摘　　要：采用静态箱-气象色谱法,将试验样地按照自上而下分为A、B、C、D四个梯度的采样点。研究了浙江天目山常绿落叶阔叶混交林2013年3月—11月期间土壤温室气体排放的时空变化特点,并分析了不同梯度的土壤温湿度与气体排放通量的相关性。结果表明:(1)天目山常绿落叶阔叶混交林土壤CO_2和CH_4两种温室气体排放/吸收季节变化特征较一致,即夏季>春季>秋季;N_2O排放通量季节变化表现为夏季>秋季>春季。其中,CO_2和N_2O表现为土壤的排放源,CH_4为大气的吸收汇。(2)空间上,CO_2通量大小表现为:D采样点>A采样点>C采样点>B采样点;土壤对CH_4吸收速率表现为A采样点>C采样点>B采样点>D采样点;土壤N_2O通量大小依次为:A采样点>C采样点>B采样点>D采样点。(3)温度是影响天目山常绿落叶阔叶混交林土壤CO_2通量重要因子;CH_4的吸收通量随温度的升高和湿度的降低而增大;在海拔较低的地区,温度是N_2O通量的重要影响因子,海拔较高地区,湿度是N_2O通量的重要限制因子。The special-temporal characteristics of greenhouse gas emission in the mixed broadleaved evergreen and deciduous forest soil were measured using static chamber gas chromatograph technique to study in Tianmu Mountain Nature Reserve. The observational results from March to November in 2013 showed that the seasonal variations of CO2 and CH4 emissions were more consistent during the period of observations. The seasonal variations of the two kinds of greenhouse gases emissions fluxes were summer 〉 spring 〉 autumn. But N2O was little different, which was summer 〉 autumn 〉 spring. CO2 and N2O were the emission sources from the mixed broadleaved evergreen and deciduous forest soil; on the contrary, CH4 was as a sink for atmosphere. From top to bottom of hill, the soil was divided into A, B, C, D four sampling sites at different gradients. CO2 flux emission amount was found as D sampling site 〉 A sampling site 〉 C sampling site 〉 B sampling site. For CO2 emission flux, based on the statistical analyses, except B and D sampling sites were different extremely significantly （p〈0.01）; there was no significant change between the rest of the sampling sites （p〉 0.05）. Soil CH4 uptake rate was found as A sampling site 〉 C sampling site 〉 B sampling site 〉 D sampling site. A sampling site was the most soil CH4 （p〈0.01）, D was the least （p〈0.01）, but there was no significant difference between B and C sampling sites （p〉 0.05）. The soil N20 flux emission rates were found as A sampling site 〉 C sampling site 〉 B sampling site 〉 D sampling site, There were no significant differences over all in N20 among the four different emission flux gradients. Through correlation analysis between forest soil temperature, humidity and greenhouse gas emission flux respectively at different gradients, the results showed that temperature was the main impact factor for CO2 flux in the mixed broadleaved evergreen and deciduous forest in Tianmu Mountain Nature Reserve. CH4 absorption increased with

关 键 词：天目山 常绿落叶阔叶阔叶混交林 排放通量 温室气体 森林土壤 

分 类 号：Q945.79[生物学—植物学] S718.5[农业科学—林学]