草业学报2016，Vol.25Issue(8)：27-35,9.DOI:10.11686/cyxb2016012
青藏高原高寒湿地温室气体释放对水位变化的响应
Responses of greenhouse gas emissions to water table fluctuations in an alpine wetland on the Qinghai-Tibetan Plateau
摘要
Abstract
A mesocosm experiment was conducted to study the effect of water table level on greenhouse gas (CO2 ,CH4 ,N2 O)emissions in alpine wetland on the Qinghai-Tibetan Plateau.Two treatments were adopt-ed;stable water table (SW;about 0 cm or at soil surface)and dynamic water table (DW;0 cm reducing to 45 cm and returning to 0 cm).The results showed that alpine wetland water table changes had no significant effect on soil dissolved organic carbon (DOC),but promoted transformations of ammonium (NH4 +-N)and nitrate (NO3 --N).The cumulative emissions of CO2 were 235.2 and 209.7 g/m2 for SW and DW treatment,respec-tively but were not significantly different.However,there was a significant treatment difference on CH4 emis-sions.Cumulative emission of CH4 for DW (0.86 g/m2 )decreased by 52.18%,compared with SW (1.79 g/m2 ).The cumulative emission of N2 O for SW (6.72 mg/m2 )was significantly higher than that for DW (7.36 mg/m2 ).There was a positive correlation between CO2/CH4 release and soil temperature in the alpine wetland with soil temperatures below about 10 ℃.The drop in the water table increased the sensitivity of CO2/CH4 release to soil temperature.Models of the response of CO2 ,CH4 and N2 O emissions to water table chan-ges were different in alpine wetland on the Qinghai-Tibetan Plateau.关键词
高寒湿地/水位/温室气体/DOC/全球变化Key words
alpine wetland/water table/greenhouse gases/DOC/global change引用本文复制引用
王冬雪,高永恒,安小娟,王瑞,谢青琰..青藏高原高寒湿地温室气体释放对水位变化的响应[J].草业学报,2016,25(8):27-35,9.基金项目
国家重点基础研究计划项目（2012CB417101）和国家自然科学基金项目（41271276）资助。 （）
