A5087616136- Forest ecology and management
- Soil Carbon and Nitrogen Dynamics
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Soil and Water Nutrient Dynamics
- Peatlands and Wetlands Ecology
- Fire effects on ecosystems
- Forest Management and Policy
- Seedling growth and survival studies
- Rangeland and Wildlife Management
- Forest Ecology and Biodiversity Studies
- Tree-ring climate responses
- Agroforestry and silvopastoral systems
- Plant Ecology and Soil Science
- Botany and Plant Ecology Studies
- Soil erosion and sediment transport
- Forest Biomass Utilization and Management
- Climate change and permafrost
- Wildlife Ecology and Conservation
- Hydrology and Watershed Management Studies
- Lichen and fungal ecology
- Plant responses to elevated CO2
- Geology and Paleoclimatology Research
- Conservation, Biodiversity, and Resource Management
- Plant and animal studies
Northern Arizona University
2016-2025
Swedish University of Agricultural Sciences
1997-2017
Colorado State University
2007-2016
Warner University
2009
University of Helsinki
2001
Institut National de Recherche Forestière
2001
Rocky Mountain Research Station
1992-1993
US Forest Service
1993
Duke University
1983-1989
Oregon State University
1981-1984
Some theories and experimental studies suggest that areas of low plant species richness may be invaded more easily than high richness. We gathered nested-scale vegetation data on richness, foliar cover, frequency from 200 1-m2 subplots (20 1000-m2 modified-Whittaker plots) in the Colorado Rockies (USA), 160 (16 Central Grasslands Colorado, Wyoming, South Dakota, Minnesota (USA) to test generality this paradigm. At scale, paradigm was supported four prairie types Grasslands, where exotic...
Forest soils have characteristic properties that set them apart from the usual types of used for growing crops. Often rocky, poor quality, and in mountainous terrain, forest are nevertheless foundation entire ecosystem, supporting a diverse assemblage plants animals. They often fragile soils, easily subject to erosion by road building or logging operation. A proper understanding is an essential component ecology maintaining diversity productivity forested land. This new edition emphasizes...
Abstract Relations among nitrogen load, soil acidification and forest growth have been evaluated based on short‐term (<15 years) experiments, or surveys across gradients of N deposition that may also include variations in edaphic conditions other pollutants, which confound the interpretation effects per se . We report trees soils a uniquely long‐term (30 experiment with annual loading an un‐polluted boreal forest. Ammonium nitrate was added to replicated ( =3) 0.09 ha plots at two doses,...
The decline in aboveground wood production after canopy closure even‐aged forest stands is a common pattern forests, but clear evidence for the mechanism causing lacking. problem fundamental to biology, commercial forestry (the sets rotation age), and carbon storage forests. We tested three hypotheses about mechanisms growth by quantifying complete budget of developing over six years (a full rotation) replicated plantations Eucalyptus saligna near Pepeekeo, Hawaii. Our first hypothesis was...
Abstract An ion exchange resin bag technique was compared to six other methods for estimating N availability. Under a controlled greenhouse environment and with well‐mixed soils, the correlated well more traditional N‐availability indices. However, bags on site in three forest stands yielded different estimates than those greenhouse. This suggests that method may be sensitive on‐site conditions not discerned by widely accepted laboratory techniques.
Abstract Soil degradation is a critical and growing global problem. As the world population increases, pressure on soil also increases natural capital of faces continuing decline. International policy makers have recognized this range initiatives to address it emerged over recent years. However, gap remains between what science tells us about its role in underpinning ecological human sustainable development, existing instruments for development. Functioning necessary ecosystem service...
For more than a century, scientists have considered whether mixtures of tree species may differ in nutrition and yield relative to monocultures. We review the empirical evidence on nutritional interactions mixtures, including information foliar nutrition, soil nutrient supply, rates input, patterns root distribution. Linear effects were most common, with intermediate value between In some cases, values for lower expected, indicating an antagonistic interaction. A few cases that included...
To determine the long—term effect of alder on soil fertility, biogeochemical fluxes were measured and calculated for two pairs adjacent, 55—yr—old stands dominated by conifers, primarily Douglas—fir (Pseudotsuga menziesii), conifers nitrogen—fixing red (Alnus rubra). At a low—fertility site in Wind River Experimental Forest southwestern Washington, biomass alder—conifer stand (289 Mg/ha) exceeded that conifer (171 Mg/ha), aboveground net primary production (ANPP) (10.3 Mg . ha — 1 yr ) was...
ABSTRACT: Forest management activities may substantially alter the quality of water draining forests, and are regulated as nonpoint sources pollution. Important impacts have been documented, in some cases, for undesirable changes stream temperature concentrations dissolved oxygen, nitrate‐N, suspended sediments. We present a comprehensive summary North American studies that examined forest practices on each these parameters quality. In most retention forested buffer strips along streams...