小兴安岭典型沼泽湿地生态系统呼吸及其影响因子

Ecosystem respiration and its affecting factors in typical marsh and shrub swamp in Xiaoxing'an Mountains

2007和2008年在植物生长季内采用静态箱-气相色谱法,研究了小兴安岭典型修氏苔草（Carexschmidtii）沼泽和油桦-修氏苔草（Betula ovalifolia-C.schmidtii）灌丛沼泽生态系统呼吸排放CO2通量的季节动态、年际动态及其与环境因子的关系,并估算了排放总量。结果表明：草丛沼泽和灌丛沼泽2007年生长季排放CO2总量分别为17841.78和20130.56kg.hm-2;2008年分别为16331.78和18294.24kg.hm-2。草丛沼泽和灌丛沼泽排放CO2通量具有明显的季节变化,最大排放量出现在夏季,其中,2007年CO2排放平均通量分别为487.89和549.62mg.m-2.h-1;2008年分别为391.53和438.31mg.m-2.h-1,年际间差异不显著,不同类型间排放差异显著。温度是季节和年际变化的关键因子,CO2排放通量和空气温度、箱内温度、0-20cm的地温均呈显著或极显著正相关,潜水位是不同类型间排放差异的主要控制因子。

By using static chamber and gas chromatography,the seasonal and inter-annual variations of CO 2 fluxes in the Carex schmidtii marsh and Betula ovalifolia-C.schmidtii shrub swamp ecosystems in Xiaoxing＇an Mountains were studied in the growth seasons of 2007 and 2008,with the relationships between these variations and environmental factors analyzed.The annual total CO 2 emissions from C.schmidtii marsh and B.ovalifolia-C.schmidtii shrub swamp were 17841.78 and 20130.56 kg·hm-2 in 2007,and 16331.78 and 18294.24 kg·hm-2 in 2008,respectively.There was an obvious seasonal variation in the CO 2 emissions during the whole observation period,with the peak in summer（487.89 and 549.62 mg·CO 2 m-2 ·h-1 in 2007,and 391.53 and 438.31 mg·CO 2 m-2 ·h-1 in 2008 for the marsh and shrub swamp,respectively）.A significant difference in the CO 2 emissions was observed between the two ecosystems,but no difference was found between years.Temperature was the key factor affecting the seasonal and inter-annual variations of CO 2 fluxes,and there existed significant positive relationships between the CO 2 fluxes and the air temperature,temperature inside the chamber,and soil temperature at 0-20 cm depth.Ground water level was also the main factor controlling the CO 2 emissions.