Measurement Guidelines For The Sequestration Of Forest Carbon

Measurement guidelines for forest carbon sequestration were developed to support reporting by public and private entities to greenhouse gas registries. These guidelines are intended to be a reference for designing a forest carbon inventory and monitoring system by professionals with a knowledge of sampling, statistical estimation, and forest measurements. This report provides guidance on defining boundaries; measuring, monitoring, and estimating changes in carbon stocks; implementing plans to measure and monitor carbon; and developing quality assurance and quality control plans to ensure credible and reproducible estimates of the carbon credits.

Measurement guidelines for forest carbon sequestration were developed to support reporting by public and private entities to greenhouse gas registries. These guidelines are intended to be a reference for designing a forest carbon inventory and monitoring system by professionals with a knowledge of sampling, statistical estimation, and forest measurements. This report provides guidance on defining boundaries; measuring, monitoring, and estimating changes in carbon stocks; implementing plans to measure and monitor carbon; and developing quality assurance and quality control plans to ensure credible and reproducible estimates of the carbon credits. Expected users include entities, e.g., individual landowners, industrial forestry companies and managers of utility company lands, within the United States who are interested in implementing forestry activities and projects designed to generate carbon credits that could be traded as an offset, or for registering carbon dioxide reductions using the U.S. Department of Energy 1605(b) voluntary reporting registry.

Measurement guidelines for forest carbon sequestration were developed to support reporting by public and private entities to greenhouse gas registries. Although developed primarily for reporting about forestry "activities"-the categories of actions comprising forestry-rather than "projects," which are specifi c carbon management undertakings, the guidelines are based on experience with methods for the latter and thus are broadly useful for carbon estimation. The national greenhouse gas registry, known as 1605(b) in reference to the original authorizing language contained in the Energy Policy Act of 1992, accepts reports by entities about their forestry activities as a bundle (Birdsey 2006). Other greenhouse gas registries, such as that maintained by the state of California, accept reports about specific forestry projects.

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.

There is increasing interest in tools for measuring and reducing emissions of carbon dioxide, a major greenhouse gas. Two tools that have been receiving a lot of attention include carbon markets and carbon registries. Carbon registries are established to record and track net carbon emission levels over time. These registries provide quantifiable and verifiable carbon for trade within a market. This report discusses the benefits and major elements of registries and then describes a selection of existing registries and protocols with forest carbon components. The report focuses on forests because of their carbon storage potential. The purpose of this report is to provide a starting point for any state government or other party considering the development of a carbon registry with a forestry component.

Contents: (1) Background: Congressional Interest in Carbon Sequestration; (2) Carbon Cycling in Forests: The Forest Cycle; Forest Types: Tropical Forests; Temperate Forests; Boreal Forests; (3) Measuring and Altering Forest Carbon Levels: Forest Carbon Accounting; Land Use Changes; Forestry Events and Management Activities: Vegetation and Soil Carbon; Forest Events ¿ Wildfires; Forestry Practices; Wood Energy; Leakage: Land Use Leakage; Product Demand Leakage; Federal Government Programs: Federal Forests; Federal Assistance for State and Private Forestry; Federal Tax Expenditures; Federal Programs Affecting Land Use; Accounting for Forest Carbon Sequestration; (4) Conclusions. Table.

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.