A5054190877- Forest Management and Policy
- Forest ecology and management
- Fire effects on ecosystems
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Remote Sensing and LiDAR Applications
- Conservation, Biodiversity, and Resource Management
- Forest Ecology and Biodiversity Studies
- Soil Carbon and Nitrogen Dynamics
- Peatlands and Wetlands Ecology
- Environmental Impact and Sustainability
- Forest Biomass Utilization and Management
- Plant responses to elevated CO2
- Bioenergy crop production and management
- Remote Sensing in Agriculture
- Climate variability and models
- Coastal wetland ecosystem dynamics
- Ecology and Vegetation Dynamics Studies
- Atmospheric chemistry and aerosols
- Forest Insect Ecology and Management
- Climate Change Policy and Economics
- Tree-ring climate responses
- Soil Geostatistics and Mapping
- Land Use and Ecosystem Services
- Rangeland and Wildlife Management
Woodwell Climate Research Center
2017-2024
US Forest Service
2010-2021
University of Toronto
2019
Utah State University
2019
University of Washington
2019
North Carolina State University
2019
Rocky Mountain Research (United States)
1995-2019
Rocky Mountain Research Station
2019
Nanjing University of Information Science and Technology
2019
University Corporation for Atmospheric Research
2018
Net average global annual uptake of atmospheric carbon dioxide by forests was 1.1 petagrams carbon, roughly one-sixth fossil fuel emissions.
Abstract Estimates of national-scale forest carbon (C) stocks and fluxes are typically based on allometric regression equations developed using dimensional analysis techniques. However, the literature is inconsistent incomplete with respect to large-scale C estimation. We compiled all available diameter-based for estimating total aboveground component biomass, defined in dry weight terms, trees United States. then implemented a modified meta-analysis published develop set consistent, biomass...
Forests are the dominant terrestrial ecosystem on Earth. We review environmental factors controlling their structure and global distribution evaluate current future trajectory. Adaptations of trees to climate resource gradients, coupled with disturbances forest dynamics, create complex geographical patterns in assemblages structures. These increasingly discernible through new satellite airborne observation systems, improved inventories, models. Forest biomass is a property affected by...
For the period 1980-89, we estimate a carbon sink in coterminous United States between 0.30 and 0.58 petagrams of per year (petagrams = 10(15) grams carbon). The net flux from atmosphere to land was higher, 0.37 0.71 year, because 0.07 0.13 exported by rivers commerce returned elsewhere. These land-based estimates are larger than those previous studies (0.08 0.35 year) inclusion additional processes revised some component fluxes. Although uncertain, about one-half total is outside forest...
There is general agreement that terrestrial systems in the Northern Hemisphere provide a significant sink for atmospheric CO2; however, estimates of magnitude and distribution this vary greatly. National forest inventories strong, measurement-based constraints on net carbon uptake. We brought together sector C budgets Canada, United States, Europe, Russia, China were derived from inventory information, allometric relationships, supplementary data sets models. Together, these suggest northern...
Carbon accumulation in forests has been attributed to historical changes land use and the enhancement of tree growth by CO2 fertilization, N deposition, climate change. The relative contribution is estimated using inventory data from five states spanning a latitudinal gradient eastern United States. Land dominant factor governing rate carbon these states, with contributing far less than previously reported. fraction aboveground net ecosystem production due 2.0 +/- 4.4%, remainder use.
Using forests to mitigate climate change has gained much interest in science and policy discussions. We examine the evidence for carbon benefits, environmental monetary costs, risks trade-offs a variety of activities three general strategies: (1) land use increase forest area (afforestation) avoid deforestation; (2) management existing forests; (3) wood as biomass energy, place other building materials, or products storage. found that many strategies can sector mitigation above current...
This paper reviews the effects of past forest management on carbon stocks in United States, and challenges for managing resources 21st century. Forests States were approximate balance with atmosphere from 1600-1800. Utilization land clearing caused a large pulse emissions during 19th century, followed by regrowth net sequestration 20th Recent data knowledge general behavior forests after disturbance suggest that rate is declining. A goal an additional 100 to 200 Tg C/yr achievable, but would...
Abstract. Most forests of the world are recovering from a past disturbance. It is well known that forest disturbances profoundly affect carbon stocks and fluxes in ecosystems, yet it has been great challenge to assess disturbance impacts estimates budgets. Net sequestration or loss CO2 by after follows predictable pattern with recovery. Forest age, which related time since disturbance, useful surrogate variable for analyses impact on carbon. In this study, we compiled first continental age...
Abstract A potentially valuable data source for estimating forest biomass is volume inventory that are widely collected and available throughout the world. In this paper we present a general methodology using such to reliably estimate aboveground density (AGBD) develop expansion factors converting directly AGBD from USDA Forest Service Inventory Analysis (FIA) data. Growing stock stand tables were combined with independently developed regression equations calculate (BEF: convert mass,...
[1] Incorporating ecological disturbance into biogeochemical models is critical for estimating current and future carbon stocks fluxes. In particular, anthropogenic disturbances, such as forest conversion wood harvest, strongly affect dynamics within North America. This paper summarizes recent (2000–2008) rates of extraction, including both derived from national inventories America (the United States, Canada, Mexico). During the 2000s, 6.1 million ha/yr were affected by another 1.0 converted...
Net primary productivity (NPP) is a key flux in the terrestrial ecosystem carbon balance, as it summarizes autotrophic input into system. Forest NPP varies predictably with stand age, and quantitative information on NPP‐age relationship for different regions forest types therefore fundamentally important cycle modeling. We used four terms to calculate NPP: annual accumulation of live biomass, mortality aboveground belowground foliage turnover soil, fine root soil. For U.S. forests first two...
Abstract We develop an approach for estimating net ecosystem exchange ( NEE ) using inventory‐based information over North America NA a recent 7‐year period (ca. 2000–2006). The notably retains on the spatial distribution of , or vertical between land and atmosphere all non‐fossil fuel sources sinks CO 2 while accounting lateral transfers forest crop products as well their eventual emissions. total estimate −327 ± 252 TgC yr −1 sink was driven primarily by uptake in Forest Lands sector (−248...
Recent climate variability (increasing temperature, droughts) and atmospheric composition changes (nitrogen deposition, rising CO 2 concentration) along with harvesting, wildfires, insect infestations have had significant effects on U.S. forest carbon (C) uptake. In this study, we attribute C in the conterminous forests to disturbance non‐disturbance factors help of inventory data, a continental stand age map, an updated Integrated Terrestrial Ecosystem Carbon Cycle model (InTEC). We grouped...