Diurnal Variations of Greenhouse Gas Fluxes from Mixed Broad-leaved and Coniferous Forest Soil in Dinghushan

编号 zgly0000360868

文献类型 期刊论文

文献题名 Diurnal Variations of Greenhouse Gas Fluxes from Mixed Broad-leaved and Coniferous Forest Soil in Dinghushan

学科分类 220.1060;森林生态学

作者 ZHOUCunyu  ZHANGDeqiang  WANGYuesi  ZHOUGuoyi  LIUShizhong  TANGXuli 

作者单位 SouthChinaBotanicalGardenChineseAcademyo(Sciences  Guangz  hou510650  P.R.China  InstituteofAtmosphericPhysics.ChineseAcademyofSciences.Beijing100029.P.R.China 

母体文献 中国林业科技: 英文版 

年卷期 2005,4(2)

页码 1-7

年份 2005 

分类号 S718.56 

关键词 鼎湖山  温室气体  辐射  吸收  流量  日变化  针阔混交林  森林土壤  森林生态效益 

文摘内容 The subtropical mixed broad-leaved and coniferous forest, a typical successional monsoon forest, is one of the major forests in the subtropics of China. Therefore, it is very important to estimate the fluxes of the greenhouse gases from the forest soil in order to evaluate the impact of subtropical forests on the greenhouse gas emissions or absorptions. This study investigated the diurnal variations of fluxes of three greenhouse gases (CO2, CH4, and N2O) from a mixed broad-leaved and coniferous forest soil. A static chamber-gas chromatograph technique was used to measure the fluxes of three greenhouse gases. By using the improved gas chromatography sampling system, the fluxes were analyzed with a single injection. In order to find out the effects of litter and seedling on the emissions or absorptions of these greenhouse gases, three treatments were set in the fleld:(1)bare soil surface (litter was removed previously); (3) litter + soil; (3) seedling + litter + soil. The experimental results demonstrated that the forest soil was a source of CO2, N2O and a weak sink of CH4.The daily fluxes of CO2, CH4, and N2O from the soil surface were in the range of 488.99～700.57, 0.049～0.108 and -0.025～ -0.053 mg/(m^2·h ), respectively. CO2 from the litter decomposition accounted for about 1/3 of the total CO2 emission from the soil surface, while the litter and seedling had no significant effect on the fluxes of CH4 and N2O. The fluxes of CO2 and N2O measured at 9:00 -11:00 a.m. were significantly different from their daily averages. Therefore, caution must be taken if the CO2 and N2O fluxes measured within 9:00-11:00 a.m. are used for extrapolation。