Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): Winter ecosystem respiration measurements using soda lime, 2010-2019

The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. Soda Lime absorption of CO2 over the winter season is a method of estimating cumulative soil respiration across the site.多年冻土碳实验加热研究（Carbon in Permafrost Experimental Heating Research，CiPEHR）项目旨在解答以下核心问题：1）生态系统升温是否会引发碳从生态系统向大气的净释放？2）占土壤碳库主体的老碳分解，是否会对生态系统碳流失产生影响？3）单独开展或联合实施的冬季与夏季升温，会如何作用于生态系统碳交换过程？本项目结合野外与室内实验手段，在位于阿拉斯加山脉山麓、阿拉斯加希利附近的高地苔原场地的升温实验样地中，测定生态系统碳平衡与放射性碳同位素比值。其中，冬季期间采用碱石灰（Soda Lime）吸收CO₂的方法，可用于估算该研究场地的累计土壤呼吸量。