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Full Description
In the summer of 2003, a workshop was held in Portsmouth, NH, to discuss land measurement techniques for the North American Carbon Program. Over 40 sci- tists representing government agencies, academia and nonprofit research organi- tions located in Canada, the US and Mexico participated. During the course of the workshop a number of topics were discussed, with an emphasis on the following: • The need for an intermediate tier of carbon measurements. This level of study would be more extensive than state-level inventories of the US Forest Service Forest Inventory and Analysis Program, but less detailed than intensive ecos- tem studies sites such as those in Long Term Ecological Research network. This tier would ideally provide a basis to link and scale remote sensing measurements and inventory data, and supply data required to parameterize existing models (see Wofsy and Harriss 2002, Denning et al. 2005). • The design criteria that such a network of sites should meet. The network and s- pling design should be standardized, but flexible enough to be applied across North America. The design also needs to be efficient enough to be implemented without the need for large field crews, yet robust enough to provide useful information. Finally, the spatial scale must permit easy linkage to remotely sensed data. • The key variables that should be measured at each site, and the frequency of measurement.
Contents
Establishing a Landscape-Scale Forest Carbon Monitoring Site.- Defining a Landscape-Scale Monitoring Tier for the North American Carbon Program.- Study Site Characterization.- Meteorological Measurements.- Measuring Aboveground Carbon Pools.- Estimating Aboveground Carbon in Live and Standing Dead Trees.- Measuring Carbon in Shrubs.- Estimating the Carbon in Coarse Woody Debris with Perpendicular Distance Sampling.- Measuring Aboveground Carbon Fluxes.- Measuring Litterfall and Branchfall.- Methods for Estimating Litter Decomposition.- Measuring the Decomposition of Down Dead-Wood.- Measuring Belowground Carbon Pools and Fluxes.- Measuring Forest Floor, Mineral Soil, and Root Carbon Stocks.- Quantifying Soil Respiration at Landscape Scales.- Measurement of Methane Fluxes from Terrestrial Landscapes Using Static, Non-steady State Enclosures.- Measurement and Importance of Dissolved Organic Carbon.- Supplemental Variables for Carbon Cycle Modeling.- Forest Canopy Structural Properties.- Estimation of Forest Canopy Nitrogen Concentration.- Lessons from the Past and Opportunities in the Future.- Integrating Field Measurements with Flux Tower and Remote Sensing Data.- Landscape-Scale Carbon Sampling Strategy - Lessons Learned.
