CAJ | 학술논문

2011年7月－2012年7月，采用静态箱－气相色谱法同步研究了尕海4种典型湿地类型的 CH4、CO2和N2 O 通量及其与温度因子的关系，并估算了其全球变暖潜势值（GWP）。结果表明，尕海湿地的 CH4、CO2和 N2 O通量具有明显的空间变化特征，CH4、CO2和 N2 O 通量最小值分别为亚高山草甸（－0．014±0．126）mg／（m2·h），沼泽湿地（137．17±284．51）mg／（m2·h）和高山湿地（－0．008±0．022）mg／（m2·h），而最大值分别为沼泽湿地（0．498±0．682）mg／（m2·h），高山湿地（497．81±473．09）mg／（m2·h）和草本泥炭地（0．094±0．117）mg／（m2·h）；同时 CH4、CO2通量有明显的时间变化特征，通量最大值分别出现在2011年的7－10月和2012年的5－7月，而后降低并维持相对稳定的变化趋势；5 cm 地温、气温、地表温度及箱内温度与4种类型湿地 CO2通量呈极显著正相关关系（P ＜0．01），与高山湿地 CH4通量均存在显著正相关关系（P ＜0．05），与其他3种湿地类型 CH4通量的相关性均较差，但与4种湿地类型 N2 O 通量无显著相关性；尕海草本泥炭地、沼泽湿地、高山湿地和亚高山草甸4种类型湿地的温室效应贡献潜力依次为35．311，13．520，34．816和30．236 t CO2／（hm2·a），沼泽湿地能够显著降低温室效应。
2011년7월－2012년7월，채용정태상－기상색보법동보연구료소해4충전형습지류형적 CH4、CO2화N2 O 통량급기여온도인자적관계，병고산료기전구변난잠세치（GWP）。결과표명，소해습지적 CH4、CO2화 N2 O통량구유명현적공간변화특정，CH4、CO2화 N2 O 통량최소치분별위아고산초전（－0．014±0．126）mg／（m2·h），소택습지（137．17±284．51）mg／（m2·h）화고산습지（－0．008±0．022）mg／（m2·h），이최대치분별위소택습지（0．498±0．682）mg／（m2·h），고산습지（497．81±473．09）mg／（m2·h）화초본니탄지（0．094±0．117）mg／（m2·h）；동시 CH4、CO2통량유명현적시간변화특정，통량최대치분별출현재2011년적7－10월화2012년적5－7월，이후강저병유지상대은정적변화추세；5 cm 지온、기온、지표온도급상내온도여4충류형습지 CO2통량정겁현저정상관관계（P ＜0．01），여고산습지 CH4통량균존재현저정상관관계（P ＜0．05），여기타3충습지류형 CH4통량적상관성균교차，단여4충습지류형 N2 O 통량무현저상관성；소해초본니탄지、소택습지、고산습지화아고산초전4충류형습지적온실효응공헌잠력의차위35．311，13．520，34．816화30．236 t CO2／（hm2·a），소택습지능구현저강저온실효응。
A study has been undertaken to estimate fluxes of the greenhouse gases carbon dioxide (CO2 ),meth-ane (CH4 )and nitrous oxide (N2 O)in wetlands,to understand the effects of temperature factors on these processes and to estimate global warming potential (GWP).Using static chamber techniques,we measured CH4 ,CO2 ,and N2 O fluxes from four wetland types in Gansu Gahai Wetlands,China,from July 2011 to July 2012.The results showed high variations in CH4 ,CO2 and N2 O fluxes between the four wetlands,with the smallest values in the subalpine meadow (-0.014 ±0.126 mg/m2 ·h),marsh wetland (137.17 ±284.51 mg/m2 ·h)and mountain wetland (-0.008 ±0.022 mg/m2 ·h)respectively.The highest values of CH4 , CO2 and N2 O fluxes were in marsh wetland (0.498±0.682 mg/m2 ·h),mountain wetland (497.81 ±473.09 mg/m2 ·h)and herbaceous peat (0.094±0.117 mg/m2 ·h)respectively.CH4 and CO2 fluxes varied seasonal- <br> ly.Maximal fluxes occurred between July-October 2011 and May-July 2012,then decreased and remained relatively steady,with some slight fluctuations during the winter and thawing or freezing periods.Further a-nalysis showed that air temperature,soil temperature (at 5 cm),surface temperature and temperature inside the box were highly significantly positively correlated with CO2 flux from the four wetlands.These variables were significantly positively correlated with CH4 flux from mountain wetland but not from the other wetland types.They were significantly negatively correlated with N2 O flux from all four wetland types.The GWP esti-mates were 35.311,13.520,34.816 and 30.236 t CO2/(hm2 · a)from herbaceous peat,marsh wetland, mountain wetland and subalpine meadow respectively.These results show that marsh wetland could signifi-cantly decrease the emission of greenhouse gases from the Gahai Wetlands.