نتایج جستجو برای: ecoregion

تعداد نتایج: 734  

2011
J. E. HALOFSKY D. C. DONATO D. E. HIBBS J. L. CAMPBELL M. DONAGHY CANNON J. B. FONTAINE J. R. THOMPSON R. G. ANTHONY B. T. BORMANN L. J. KAYES B. E. LAW D. L. PETERSON T. A. SPIES

Although mixed-severity fires are among the most widespread disturbances influencing western North American forests, they remain the least understood. A major question is the degree to which mixed-severity fire regimes are simply an ecological intermediate between lowand high-severity fire regimes, versus a unique disturbance regime with distinct properties. The Klamath-Siskiyou Mountains of so...

2007
Robert Costanza Brendan Fisher Kenneth Mulder Shuang Liu

Article history: Received 21 December 2005 Received in revised form 6 March 2006 Accepted 27 March 2006 Available online 19 May 2006 Biodiversity (BD) and Net Primary Productivity (NPP) are intricately linked in complex ecosystems such that a change in the state of one of these variables can be expected to have an impact on the other. Usingmultiple regression analysis at the site and ecoregion ...

2014
Ian R. Waite Jonathan G. Kennen Jason T. May Larry R. Brown Thomas F. Cuffney Kimberly A. Jones James L. Orlando

We developed independent predictive disturbance models for a full regional data set and four individual ecoregions (Full Region vs. Individual Ecoregion models) to evaluate effects of spatial scale on the assessment of human landscape modification, on predicted response of stream biota, and the effect of other possible confounding factors, such as watershed size and elevation, on model performa...

Journal: :Global Ecology and Biogeography 2022

Aim The aim was to characterize fire regimes and estimate regime parameters (area burnt, size, intensity, season, patchiness pyrodiversity) at broad spatial scales using remotely sensed individual-fire data. Location Western part of the Palaearctic realm (i.e., Europe, North Africa Near East). Time period 2001–2021. Methods Initially, I divided study area into eight large ecoregions based on th...

Journal: :Global change biology 2016
Keryn I Paul Stephen H Roxburgh Jerome Chave Jacqueline R England Ayalsew Zerihun Alison Specht Tom Lewis Lauren T Bennett Thomas G Baker Mark A Adams Dan Huxtable Kelvin D Montagu Daniel S Falster Mike Feller Stan Sochacki Peter Ritson Gary Bastin John Bartle Dan Wildy Trevor Hobbs John Larmour Rob Waterworth Hugh T L Stewart Justin Jonson David I Forrester Grahame Applegate Daniel Mendham Matt Bradford Anthony O'Grady Daryl Green Rob Sudmeyer Stan J Rance John Turner Craig Barton Elizabeth H Wenk Tim Grove Peter M Attiwill Elizabeth Pinkard Don Butler Kim Brooksbank Beren Spencer Peter Snowdon Nick O'Brien Michael Battaglia David M Cameron Steve Hamilton Geoff McAuthur Jenny Sinclair

Accurate ground-based estimation of the carbon stored in terrestrial ecosystems is critical to quantifying the global carbon budget. Allometric models provide cost-effective methods for biomass prediction. But do such models vary with ecoregion or plant functional type? We compiled 15 054 measurements of individual tree or shrub biomass from across Australia to examine the generality of allomet...

Journal: :Journal of environmental quality 2010
D Longing B E Haggard

Acquisition and compilation of water-quality data for an 11-yr time period (1996-2006) from 589 stream and river stations were conducted to support nutrient criteria development for the multistate Red River Basin shared by Arkansas, Louisiana, New Mexico, Oklahoma, and Texas. Ten water-quality parameters were collected from six data sources (USGS, Arkansas Department of Environmental Quality, L...

2013
Catherine Bodart Andreas B Brink François Donnay Andrea Lupi Philippe Mayaux Frédéric Achard

AIM This study provides regional estimates of forest cover in dry African ecoregions and the changes in forest cover that occurred there between 1990 and 2000, using a systematic sample of medium-resolution satellite imagery which was processed consistently across the continent. LOCATION The study area corresponds to the dry forests and woodlands of Africa between the humid forests and the se...

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