Estimating the Net Primary and Net Ecosystem Production of a Southeastern Upland Quercus Forest from an 8-Year Biometric Record

摘要: Although 8 years of manipulated precipitation levels have not produced significant tree-growth responses in an upland Quercus forest eastern Tennessee (Hanson et al. 2001), interannual differences physiological processes (Chapters 3, 4, 6–8, and 10, this volume), storage carbohydrates (Chapter 5, tree sapling growth rates 15, root 16, foliar-litter production 17, volume) suggest that net primary (NPP) ecosystem (NEP) are likely. By accepted definition, NPP is the difference between carbon gain from autotrophic organisms (i.e., gross production, GPP) minus respiration (R auto). NEP annual change defined as heterotrophic hetero). At local scale, may also be reduced non-CO2 losses volatile organic compounds (VOCs) vegetation (Guenther 1996; Isebrands 1999) soils Hoffman 1994) under ambient or flooded conditions loss CH4 soils, respectively (LeMer Roger 2000).