Spatial Variability of CO2, CH4, and N2O Fluxes during Midsummer in the Steppe of Northern China | |
Cheng, JZ; Lee, XQ; Theng, BKG; Fang, B; Yang, F; Wang, B; Zhang, LK | |
2014 | |
发表期刊 | Polish JournalL of EnvironmentalL Studies |
卷号 | 23期号:2页码:319-328 |
摘要 | Spatial variability is a major source of uncertainty in estimating the fluxes of greenhouse gases between steppe and atmosphere. The fluxes of CO2, CH4, and N2O were carried out between 08:00 and 10:00 h. of the following day during the midsummer period from a transect (area: 5.25x10(6) ha) in the semiarid steppe of northern China, using the dark static chamber technique and gas chromatography. Two land uses were chosen for this study: soils with plant covers and bare soils. Daily average GHG fluxes from the steppe transect were: 1.3x10(5) t C for CO2, -66.3 t C for CH4, and 1.1 t N for N2O. The emission of CO2 from soils with plant cover was significantly higher (P < 0.05) than that from the corresponding bare soils. The canopy effect, however, was observed for neither CH4 (P = 0.058) nor N2O (P = 0.772). Air temperature and relative humidity were the major factors affecting the diurnal variation in site-based CO2 flux (P < 0.05), while soil pH controlled its spatial variation (P < 0.05). The spatial uptake of CH4 correlated negatively with soil total N (TN) content (P < 0.05), while the flux of N2O significantly increased with soil organic carbon (P = 0.031) and TN (P = 0.022), indicating that soil organic matter is an important factor determining the N2O flux in the steppe of northern China. |
关键词 | Carbon Cycle Greenhouse Gas Climate Change Grassland Semiarid Region |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/352002/5213 |
专题 | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
推荐引用方式 GB/T 7714 | Cheng, JZ,Lee, XQ,Theng, BKG,et al. Spatial Variability of CO2, CH4, and N2O Fluxes during Midsummer in the Steppe of Northern China[J]. Polish JournalL of EnvironmentalL Studies,2014,23(2):319-328. |
APA | Cheng, JZ.,Lee, XQ.,Theng, BKG.,Fang, B.,Yang, F.,...&Zhang, LK.(2014).Spatial Variability of CO2, CH4, and N2O Fluxes during Midsummer in the Steppe of Northern China.Polish JournalL of EnvironmentalL Studies,23(2),319-328. |
MLA | Cheng, JZ,et al."Spatial Variability of CO2, CH4, and N2O Fluxes during Midsummer in the Steppe of Northern China".Polish JournalL of EnvironmentalL Studies 23.2(2014):319-328. |
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