Technical Report: Impacts of Land Management and Climate on Agroecosystem Greenhouse Gas Exchange in the Upper Midwest United States

Timothy J. Griffis ; John M. Baker

关键词: CARBON;    CLIMATES;    ECOSYSTEMS;    GREENHOUSE GASES;    ISOTOPE RATIO;    MANAGEMENT;    PHOTOSYNTHESIS;    RESPIRATION;    SEASONAL VARIATIONS;    STABLE ISOTOPES climate Change;    greenhouse gases;    carbon cycle;    AmeriFlux;    agricultural ecosystems;   

DOI  :  10.2172/953624
RP-ID  :  FG02-03ER63684-3
PID  :  OSTI ID: 953624
Others  :  TRN: US201002%%342

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Our research is designed to improve the scientific understanding of how carbon is cycled between the land and atmosphere within a heavily managed landscape that is characteristic of the Upper Midwest. The Objectives are: 1) Quantify the seasonal and interannual variation of net ecosystem CO2 exchange of agricultural ecosystems in the Upper Midwest grown under different management strategies; 2) Partition net ecosystem CO2 exchange into photosynthesis and ecosystem respiration by combining micrometeorological and stable isotope techniques; 3) Examine the seasonal variation in canopy-scale photosynthetic discrimination and the isotope ratios of ecosystem respiration and photosynthesis.