Boreal peatlands represent a large global carbon pool. The relationships between carbon mineralization, soil temperature and moisture in the permafrost peatlands of the Great Hing＇an Mountains, China, were examined. ...Boreal peatlands represent a large global carbon pool. The relationships between carbon mineralization, soil temperature and moisture in the permafrost peatlands of the Great Hing＇an Mountains, China, were examined. The CO2 emissions were measured during laboratory incubations of samples from four sites under different temperatures （5, 10, 15, and 20℃） and moisture contents （0%, 30%, 60%, 100% water holding capacity （WHC） and completely water saturated）. Total carbon mineralization ranged from 15.51 to 112.92 mg C under the treatments for all sites. Carbon mineralization rates decreased with soil depth, increased with temperature, and reached the highest at 60% WHC at the same temperature. The calculated temperature coefficient （Q10） values ranged from 1.84 to 2.51 with the soil depths and moisture. However, the values were not significantly affected by soil moisture and depth for all sites due to the different peat properties （P 〉 0.05）. We found that the carbon mineralization could be successfully predicted as a two-compartment function with temperature and moisture （R^2 〉 0.96） and total carbon mineralization was significantly affected by temperature and moisture （P 〈 0.05）. Thus, temperature and moisture would play important roles in carbon mineralization of permafrost peatlands in the Great Hing＇an Mountains, indicating that the permafrost peatlands would be sensitive to the environment change, and the permafrost peatlands would be potentially mineralized under future climate change.展开更多
当前泥炭所揭示的区域古植被、古气候与环境变化相关工作已广泛开展,然而对于泥炭地本身演化的研究却很少涉及,尤其是对于大兴安岭北部多年冻土泥炭地演化及其影响因素仍不清晰,阻碍了人们对这一特殊类型泥炭地历史动态和未来发展趋势...当前泥炭所揭示的区域古植被、古气候与环境变化相关工作已广泛开展,然而对于泥炭地本身演化的研究却很少涉及,尤其是对于大兴安岭北部多年冻土泥炭地演化及其影响因素仍不清晰,阻碍了人们对这一特殊类型泥炭地历史动态和未来发展趋势的认知。为此基于大兴安岭北部多年冻土泥炭岩芯孢粉证据,利用AMS14C测年技术,重建了区域3500 cal a BP以来植被与气候历史,并与其他古气候指标进行对比,从而揭示区域泥炭地演化及其影响因素。结果表明:3500—2900 cal a BP植被以松属、喜暖乔木及水龙骨科为主,气候温暖湿润成为泥炭孕育期;2900—2250 cal a BP植被以松属、喜暖乔木及蒿属为主,气候温暖潮湿成为泥炭发育启动期;2250—1650 cal a BP植被以松属、桦属及水龙骨科为主,气候寒冷湿润成为泥炭发育旺盛期;1650—1150 cal a BP植被以松属和蒿属为主,气候寒冷干燥成为泥炭发育减缓和停滞期;1150—750 cal a BP阔叶林和湿地植被扩张,气候温暖湿润成为泥炭发育再次启动期,完成由富营养沼泽到中营养沼泽类型的转变;750 cal a BP至今植被以松属、桤木属及莎草科为主,气候寒冷湿润成为泥炭发育再次旺盛期,中营养沼泽开始向贫营养沼泽类型过渡。造成多年冻土泥炭地演化的主导因素并不是地质地貌变动和人类活动,而是来自气候变化及其驱动下多年冻土环境的改变,因此气候变化才是影响多年冻土泥炭地演化的主动力,未来多年冻土泥炭地变化取决于全球气候的发展。展开更多
基金supported by the National Natural Science Foundation of China (No. 40671013,40871245)
文摘Boreal peatlands represent a large global carbon pool. The relationships between carbon mineralization, soil temperature and moisture in the permafrost peatlands of the Great Hing＇an Mountains, China, were examined. The CO2 emissions were measured during laboratory incubations of samples from four sites under different temperatures （5, 10, 15, and 20℃） and moisture contents （0%, 30%, 60%, 100% water holding capacity （WHC） and completely water saturated）. Total carbon mineralization ranged from 15.51 to 112.92 mg C under the treatments for all sites. Carbon mineralization rates decreased with soil depth, increased with temperature, and reached the highest at 60% WHC at the same temperature. The calculated temperature coefficient （Q10） values ranged from 1.84 to 2.51 with the soil depths and moisture. However, the values were not significantly affected by soil moisture and depth for all sites due to the different peat properties （P 〉 0.05）. We found that the carbon mineralization could be successfully predicted as a two-compartment function with temperature and moisture （R^2 〉 0.96） and total carbon mineralization was significantly affected by temperature and moisture （P 〈 0.05）. Thus, temperature and moisture would play important roles in carbon mineralization of permafrost peatlands in the Great Hing＇an Mountains, indicating that the permafrost peatlands would be sensitive to the environment change, and the permafrost peatlands would be potentially mineralized under future climate change.
文摘当前泥炭所揭示的区域古植被、古气候与环境变化相关工作已广泛开展,然而对于泥炭地本身演化的研究却很少涉及,尤其是对于大兴安岭北部多年冻土泥炭地演化及其影响因素仍不清晰,阻碍了人们对这一特殊类型泥炭地历史动态和未来发展趋势的认知。为此基于大兴安岭北部多年冻土泥炭岩芯孢粉证据,利用AMS14C测年技术,重建了区域3500 cal a BP以来植被与气候历史,并与其他古气候指标进行对比,从而揭示区域泥炭地演化及其影响因素。结果表明:3500—2900 cal a BP植被以松属、喜暖乔木及水龙骨科为主,气候温暖湿润成为泥炭孕育期;2900—2250 cal a BP植被以松属、喜暖乔木及蒿属为主,气候温暖潮湿成为泥炭发育启动期;2250—1650 cal a BP植被以松属、桦属及水龙骨科为主,气候寒冷湿润成为泥炭发育旺盛期;1650—1150 cal a BP植被以松属和蒿属为主,气候寒冷干燥成为泥炭发育减缓和停滞期;1150—750 cal a BP阔叶林和湿地植被扩张,气候温暖湿润成为泥炭发育再次启动期,完成由富营养沼泽到中营养沼泽类型的转变;750 cal a BP至今植被以松属、桤木属及莎草科为主,气候寒冷湿润成为泥炭发育再次旺盛期,中营养沼泽开始向贫营养沼泽类型过渡。造成多年冻土泥炭地演化的主导因素并不是地质地貌变动和人类活动,而是来自气候变化及其驱动下多年冻土环境的改变,因此气候变化才是影响多年冻土泥炭地演化的主动力,未来多年冻土泥炭地变化取决于全球气候的发展。
