Consulta: subjectFacets:"Rangeland"
Registros recuperados: 7
Data/hora: 06/06/2024 02:13:46

Tools for Resilience Management:  Multidisciplinary Development of State-and-Transition Models for Northwest Colorado
Provedor de dados: 7
Autores: Kachergis, Emily J.; Bureau of Land Management, Denver, Colorado; emily.kachergis@gmail.com; Knapp, Corrine N.; Alaska Center for Climate and Policy; corrieknapp@yahoo.com; Fernandez-Gimenez, Maria E.; Department of Forest and Rangeland Stewardship, Colorado State University; Maria.Fernandez-Gimenez@colostate.edu; Ritten, John P.; Department of Agricultural and Applied Economics, University of Wyoming; John.Ritten@uwyo.edu; Pritchett, James G.; Department of Agricultural and Resource Economics, Colorado State University; James.Pritchett@colostate.edu; Parsons, Jay; Western Center for Integrated Resource Management, Colorado State University; Jay.Parsons@colostate.edu; Hibbs, Willow; Wyoming Game and Fish Department and USDA-NRCS; Willow.Hibbs@wy.usda.gov; Roath, Roy; Department of Forest and Rangeland Stewardship, Colorado State University; Roy.Roath@colostate.edu.
Building models is an important way of integrating knowledge.  Testing and updating models of social-ecological systems can inform management decisions and, ultimately, improve resilience.  We report on the outcomes of a six-year, multidisciplinary model development process in the sagebrush steppe, USA. We focused on creating state-and-transition models (STMs), conceptual models of ecosystem change that represent nonlinear dynamics and are being adopted worldwide as tools for managing ecosystems.  STM development occurred in four steps with four distinct sets of models:  (1) local knowledge elicitation using semistructured interviews; (2) ecological data collection using an observational study; (3) model integration using participatory workshops; and (4)...
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive management; Ecology; Ecosystem dynamics; Knowledge integration; Participatory research; Rangeland; Sagebrush steppe.
Ano: 2013

Grazing height management does not change the persistence pathway of Andropogon lateralis in a natural pasture
Provedor de dados: 86
Autores: Giustina Junior,Luis Henrique Paim Della; Zanella,Pablo Giliard; Baldissera,Tiago Celso; Pinto,Cassiano Eduardo; Garagorry,Fabio Cervo; Sbrissia,André Fischer.
Abstract: The objective of this work was to evaluate tiller dynamics and population stability of Andropogon lateralis in a natural pasture subjected to grazing height management under intermittent stocking method. The experiment was carried out in a randomized complete block design with four treatments and four replicates, in 16 experimental units of 875 m2 each. The treatments consisted of four pre-grazing heights of A. lateralis (12, 20, 28, and 36 cm), which was grazed until its initial height was reduced by 40%. Dynamics of tiller birth and death were evaluated using the marked tiller technique over a period of 18 months, from October 2015 to March 2017. The results indicate that the use of different heights for the management of natural pastures does...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy height; Rangeland; Survival strategy; Tiller dynamics.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000104301

Aboveground biomass and concentration of nutrients in semiarid rangeland plant species: Influence of grazing and soil moisture
Provedor de dados: 85
Autores: Gul,B; Islam,M; Ahmad,S; Gul,S.
Spatial and temporal patterns of aboveground biomass and nutritive value of rangeland species with respect to the influence of grazing and soil moisture were investigated. The research was conducted during two years at the Tomagh Research Station, near Sanjawi, Ziarat District, Balochistan, Pakistan. This area is protected from grazing since 1998; however, some of the area is open for grazing. Tree sites were selected for research purposes: a protected plain, a protected hilly, and an unprotected plain grazed area. Sampling was carried out during the spring, summer and autumn seasons. Results revealed that soil moisture was greater at the protected than unprotected sites. The aboveground plant biomass was 66% to 76% lower at unprotected than protected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rangeland; Biomass production; Season; Semiarid; Grazing; Grass.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100013

THE IMPACT OF KNAPWEED ON MONTANA'S ECONOMY
Provedor de dados: 31
Autores: Hirsch,   Steven A.; Leitch,   Jay A.
The economic impact of three invasive, exotic weeds--diffuse, spotted, and Russian knapweed (Centaurea diffusa, C. maculosa, and Acroptilon repens)--on Montana's economy was estimated using a procedure developed for another invasive weed species.  Published data and that from a survey of county weed boards were used to estimate direct negative impacts of over $14 million annually due to infestation of over 2 million acres of rangeland and wildland.  This amounts to about $10.63 on each infested grazing land acre and $3.95 on each infested wildland acre.  Direct plus secondary economic impacts, estimated using an input-output model, are about $42 million annually, which could support over 500 jobs in the state's economy. This first approximation suggests...
Tipo: Working or Discussion Paper
Palavras-chave: Knapweed (Centaurea diffusa; C. maculosa; And Acroptilon repens); Montana; Economic impact; Invasive weeds; Rangeland; Wildland; Resource /Energy Economics and Policy.
Ano: 1996
URL: http://purl.umn.edu/23289

Invasive Weeds, Wildfire, and Rancher Decision Making in the Great Basin
Provedor de dados: 31
Autores: Kobayashi,   Mimako; Harris,   Thomas R.; Rollins,   Kimberly S.
In this article, a numerical stochastic dynamic programming model (SDP) is developed to characterize the decision problem of a rancher operating on rangelands in northern Nevada that are affected by invasive annual grasses and wildfire.  The model incorporates decisions about herd size management of a cow-calf operation and fuels treatment to reduce the size of rangeland wildfires.  Currently, high transactions costs to obtain permits to implement land treatments on federally-owned rangelands appear to limit rancher involvement.  The results of the model suggest that ranch income motives alone are likely insufficient for private ranchers to adopt preventative land treatments.  The current treatment cost ($20 per acre at the minimum) appears to be...
Tipo: Conference Paper or Presentation
Palavras-chave: Stochastic dynamic programming; Cow-calf operation; Rangeland; Ecosystem; Livestock Production/Industries; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/49365

Major Uses of Land in The United States, 2002
Provedor de dados: 31
Autores: Lubowski,   Ruben N.; Vesterby,   Marlow; Bucholtz,   Shawn; Baez,   Alba; Roberts,   Michael J.
This publication presents the results of the latest (2002) inventory of U.S. major land uses, drawing on data from the Census, public land management and conservation agencies, and other sources. The data are synthesized by State to calculate the use of several broad classes and subclasses of agricultural and nonagricultural land over time. The United States has a total land area of nearly 2.3 billion acres. Major uses in 2002 were forest-use land, 651 million acres (28.8 percent); grassland pasture and range land, 587 million acres (25.9 percent); cropland, 442 million acres (19.5 percent); special uses (primarily parks and wildlife areas), 297 million acres (13.1 percent); miscellaneous other uses, 228 million acres (10.1 percent); and urban land, 60...
Tipo: Report
Palavras-chave: Land use; Land-use change; Agricultural land; Nonagricultural land; Cropland; Forest-use land; Forestland; Pasture; Rangeland; Rural residential land; Special uses; Urban land; Land Economics/Use.
Ano: 2006
URL: http://purl.umn.edu/7203

Biological vulnerability in the Elqui Valley (Coquimbo Region, Chile) to economically important arthropods
Provedor de dados: 118
Autores: Pizarro-Araya,Jaime; Cepeda-Pizarro,Jorge; Barriga,Juan E; Bodini,Andrés.
Current climate conditions in north-central Chile (25057'-32013'S,71043'-68°16'W)are characterized by increasing temperatures and decreasing rainfall. Global warming is expected to alter the hydrology and ecoclimatic characteristics of north-central basins with multiple effects, including changes in plant and arthropod phenology and biodiversity. Among these basins, the Elqui Valley (29°50'S, 70°52'W) stands out for its large population and the economic importance of tourism and agriculture. The taxonomic composition of agriculturally and medically important arthropods was studied in three locations in the Elqui Valley by manual capture of specimens and interviews with farmers, agricultural workers, and local leaders. Out of a total of 145 species of...
Tipo: Journal article
Palavras-chave: Arthropods; Climate change; Agricultural cropland; Rangeland; Elqui Valley; Arid zones.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200006