Effects of temperature, soil moisture, soil type and their interactions on soil carbon mineralization in Zoig alpine wetland, Qinghai-Tibet Plateau
Effects of temperature, soil moisture, soil type and their interactions on soil carbon mineralization in Zoig alpine wetland, Qinghai-Tibet Plateau
复制标题
温度、土壤湿度、土壤类型及其相互作用对若尔格土壤碳矿化的影响
DOI：
10.1007/s11769-011-0439-3
复制
发表时间：
2011-02-01
影响因子：
3.4
通讯作者：
Zhang Mingxiang
中科院分区：
文献类型：
--
作者：
Gao Junqin;Ouyang Hua;Zhang Mingxiang
湿地储存了大量的碳，并可能对全球气候变化的争论做出巨大贡献。然而，全球气候变化对青藏高原若尔盖高寒湿地碳矿化的影响研究较少。通过室内培养试验，研究了温度、土壤水分、土壤类型（沼泽土和泥炭土）及其交互作用对若尔盖高寒湿地CO2和CH 4排放速率的影响。结果表明，当温度从5A ℃升高到35 A ℃时，沼泽土和泥炭土的CO2排放速率在非淹没处理下分别增加3.3-3.7倍和2.4-2.6倍，在淹没处理下分别增加2.2-2.3倍和4.1-4.3倍。淹水处理下沼泽土和泥炭土的CO2排放速率分别比未淹水处理降低6%~ 44%和20%~ 60%。CO2排放速率受温度和土壤类型（p < 0.001）、土壤水分和土壤类型（p < 0.001）的联合作用影响显著，CH 4排放速率受温度和土壤水分的交互作用影响显著（p < 0.001）。CO2排放速率的Q（10）值在5A ℃ ~ 25 A ℃范围内高于25 A ℃ ~ 35 A ℃范围，表明若尔盖高寒湿地碳矿化对低温更为敏感。
Wetland stores substantial amount of carbon and may contribute greatly to global climate change debate. However, few researches have focused on the effects of global climate change on carbon mineralization in Zoig alpine wetland, Qinghai-Tibet Plateau, which is one of the most important peatlands in China. Through incubation experiment, this paper studied the effects of temperature, soil moisture, soil type (marsh soil and peat soil) and their interactions on CO2 and CH4 emission rates in Zoig alpine wetland. Results show that when the temperature rises from 5A degrees C to 35A degrees C, CO2 emission rates increase by 3.3-3.7 times and 2.4-2.6 times under non-inundation treatment, and by 2.2-2.3 times and 4.1-4.3 times under inundation treatment in marsh soil and peat soil, respectively. Compared with non-inundation treatment, CO2 emission rates decrease by 6%-44%, 20%-60% in marsh soil and peat soil, respectively, under inundation treatment. CO2 emission rate is significantly affected by the combined effects of the temperature and soil type (p < 0.001), and soil moisture and soil type (p < 0.001), and CH4 emission rate was significantly affected by the interaction of the temperature and soil moisture (p < 0.001). Q (10) values for CO2 emission rate are higher at the range of 5A degrees C-25A degrees C than 25A degrees C-35A degrees C, indicating that carbon mineralization is more sensitive at low temperature in Zoig alpine wetland.