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Abstract (from: http://link.springer.com/article/10.1007/s00442-014-2881-2): Forest biomass growth is almost universally assumed to peak early in stand development, near canopy closure, after which it will plateau or decline. The chronosequence and plot remeasurement approaches used to establish the decline pattern suffer from limitations and coarse temporal detail. We combined annual tree ring measurements and mortality models to address two questions: first, how do assumptions about tree growth and mortality influence reconstructions of biomass growth? Second, under what circumstances does biomass production follow the model that peaks early, then declines? We integrated three stochastic mortality models with...
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Abstract (from http://www.srmjournals.org/doi/abs/10.2111/REM-D-13-00079.1): Big sagebrush, Artemisia tridentata Nuttall (Asteraceae), is the dominant plant species of large portions of semiarid western North America. However, much of historical big sagebrush vegetation has been removed or modified. Thus, regeneration is recognized as an important component for land management. Limited knowledge about key regeneration processes, however, represents an obstacle to identifying successful management practices and to gaining greater insight into the consequences of increasing disturbance frequency and global change. Therefore, our objective is to synthesize knowledge about natural big sagebrush regeneration. We identified...
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File-based data for download: https://www.sciencebase.gov/catalog/item/632a1290d34e71c6d67b9061Related report with figures: https://doi.org/10.3133/ofr20221081Location and extent of the human modification threat across the sagebrush biome in the United States for 2020. Blue areas (dark and light,representing core sagebrush areas [CSAs] and growth opportunity areas [GOAs], respectively) are locations of high sagebrush ecological integrityand could serve as anchor points in an overall biome-wide strategy. A separate, high-resolution portable document format (PDF) version of this mapis available at https://doi.org/10.3133/ofr20221081 so that stakeholders can zoom in and see the results at much smaller scales. By zooming...
Categories: Data;
Tags: Arizona,
California,
Colorado,
Complete,
Data, All tags...
Data.gov USFWS Science Applications,
Idaho,
Montana,
Nebraska,
Nevada,
New Mexico,
North Dakota,
Oregon,
SA Science Catalog,
South Dakota,
USFWS AGOL,
USGS:62d57e89d34e87fffb2dda62,
Utah,
Washington,
Wyoming,
biogeography,
biota,
climate change,
conservation,
conservation design,
core sagebrush areas,
data release,
ecological integrity,
ecological processes,
ecosystem resilience,
environment,
geographic patterns,
growth areas,
growth opportunity areas,
habitats,
human impacts,
human modification,
natural resource management,
other rangeland areas,
overlay,
quantitative data,
remediation,
remote sensing,
restoration,
sagebrush,
sagebrush biome,
sagebrush threats,
temporal scale,
threats,
time series datasets,
western United States,
wildlife habitat, Fewer tags
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These data were compiled in order to represent long-term (multi-decadal) forest growth across eight different experimental forests in the United States, each with replicated levels of density treatments, as well as an important drought index correlated to growth. Forests around the world are experiencing severe droughts and elevated competitive intensity due to increased tree density. These data can be utilized to not only examine differences in within-stand competition, as well the trends and impact of drought in different forests across a broad climatic gradient, but also the influence of interactions between drought and competition on forest growth. Growth is measured as a treatment level, annual basal area increment...
Categories: Data;
Tags: Argonne Experimental Forest,
Arizona,
Bartlett Experimental Forest,
Birch Lake Experiment,
Black Hills Experimental Forest, All tags...
Black Hills National Forest,
Chequamegon National Forest,
Chippewa National Forest,
Climate,
Climatology,
Competition,
Cutfoot Experimental Forest,
Data Visualization & Tools,
Dendrochronology,
Drought,
Drought,
Drought, Fire and Extreme Weather,
Flagstaff,
Forest Density,
Forest Health,
Forestry,
Forests,
Fort Valley Experimental Forest,
Landscapes,
Maine,
Minnesota,
National CASC,
New Hampshire,
Nicolet National Forest,
Ohio,
Orono,
Penobscot Experimental Forest,
Resilience,
Resistance,
Science Tools For Managers,
Silviculture,
South Dakota,
Superior National Forest,
Taylor Woods,
USGS Science Data Catalog (SDC),
Vinton Furnace Experimental Forest,
White Mountain National Forest,
Wisconsin, Fewer tags
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Drylands cover 40% of the global terrestrial surface and provide important ecosystem services. While drylands as a whole are expected to increase in distribution and aridity in coming decades, temperature and precipitation forecasts vary by latitude and geographic region suggesting different trajectories for tropical, subtropical, and temperate drylands. Uncertainty in the future of tropical and subtropical drylands is well constrained, whereas soil moisture and ecological droughts, which drive vegetation productivity and composition, remain poorly understood in temperate drylands. Here we show that, over the 21st century, temperate drylands may contract by a third, primarily converting to subtropical drylands,...
Categories: Data,
Publication;
Types: Citation;
Tags: Eastern Asia,
North America,
South America,
Southern Africa,
USGS Science Data Catalog (SDC), All tags...
Western Mediterranean,
Western and Central Asia,
climate change,
climatology,
drylands,
ecology,
hydrology,
soil sciences,
vegetation, Fewer tags
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