温度对大兴安岭北坡多年冻土湿地泥炭有机碳矿化的影响  

EFFECTS OF TEMPERATURE ON THE CARBON MINERALIZATION OF PEAT IN THE PERMAFROST WETLAND IN THE DA HING'AN MOUNTAINS

作　　者：王宪伟[1,2,3] 李秀珍[1] 吕久俊[1,2] 孙菊[1,2] 李宗梅[1,2] 吴志丰[1,2] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049 [3]中国科学院东北地理与农业生态研究所,长春130012

出　　处：《第四纪研究》2010年第3期591-597,共7页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:40671013和40871245)资助

摘　　要：温度是影响湿地土壤有机碳累积和分解的主要环境因子之一。通过室内培养实验分析温度对大兴安岭北坡连续多年冻土区湿地泥炭有机碳矿化的影响,其中采样点北极村、图强和壮林(52°45′～53°12′N,122°16′～122°46′E)位于大兴安岭的西北坡,而飞虎山和呼中(51°45′～52°09′N,122°57′～123°02′E)位于大兴安岭的东北坡。室内培养实验在4个温度梯度下(5℃,10℃,15℃和20℃)进行,湿地土壤有机碳矿化释放的CO_2采用碱液吸收法测量。结果表明随着温度的升高,有机碳的矿化具有增加的趋势,在40天的培养期内,泥炭总的矿化量变化范围为24.87～112.92mg/g;同一温度下,泥炭矿化率随着培养时间具有先降低后稳定的趋势,两层泥炭(10～20cm和20～30cm)对温度的响应趋势基本相同,不过表层泥炭的矿化率和矿化量要高于深层泥炭。有机碳矿化温度敏感性系数Q_(10)值变化范围为2.03～2.41,而深层泥炭的Q_(10)值相对较大,表明冻土湿地深层泥炭对增温的响应也较敏感,并且大兴安岭东北坡冻土湿地的Q_(10)值要大于西北坡的冻土湿地,表明大兴安岭东北坡的冻土湿地对于气候变暖的响应将更强烈。并且基于Q_(10)值的二元动力学方程很好的反映了大兴安岭北坡冻土湿地泥炭矿化随温度和时间的动态变化。Temperature is the one of the important environmental factors that affects the accumulation and decomposition of soil organic carbon. In this paper, the effects of temperature on soil organic carbon mineralization were studied through indoor incubation experiments of peat samples. The peat samples were collected from the peatlands of Beijicun,Tuqiang and Zhuanglin （52°45＇～53°12＇N,122°16＇～122°46＇E）on the northwest slope of of the Da Hing＇an Mountains and the peatlands of Huzhong and Feihushan（51°45＇～52°09＇N,122°57＇～123°02＇E） on the northeast slope. The incubation experiments was carried out under well controlled temperatures（5℃, 10℃, 15℃ and 20℃ ）and the soil carbon mineralization was determined using alkali traps by absorbing CO2 production from the peat samples. The experiment results show that the peat carbon mineralization increased with rising temperature. During 40 day incubation, the total carbon mineralization ranged from 24. 87mg/g to 113.92mg/g. Under the same temperature, there was a trend that the rates of carbon mineralization early decreased and then increased until becoming stable. In the experiment including two superimposed peat layers（ 10- 20cm and 20 30cm） ,they had similar carbon mineralization responses to warming temperature. But the carbon mineralization in the upper peat layer was larger than that in the lower layer. The values of the temperature-sensitive coefficient Q10 of organic carbon varied from 2.03 to 2.41 ,but the values in the deeper peat layers were close to those in the upper layers, suggesting that the deeper peat would also be sensitive to warming temperature. Calculations by a temperature-sensitive equation of the carbon mineralization show that the Q10 values of soils of permafrost wetlands on the northeastern slope of the Da Hing＇an Mountains are larger than the Q10 values on the northwestern slope. It means that permafrost wetlands on the northeastern slope would be more sensitive to climate warming. Also, a dynam

关 键 词：大兴安岭 冻土湿地 有机碳矿化 

分 类 号：S153.62[农业科学—土壤学] X14[农业科学—农业基础科学]