نتایج جستجو برای: Vegetation-based scenarios

تعداد نتایج: 3030305  

   Agricultural hillslopes with susceptible loess enters a large amount of runoff and sediment into the Gorgan city annually, due to the inappropriate drainage system which cause a lot of financial losses city. The purpose of this study was to investigate the effect of different vegetation scenarios on the runoff and sediment discharge from three hillslopes of catchment of ​​5.9 hectares. The r...

Journal: :Ecology 2009
Linda B Brubaker Philip E Higuera T Scott Rupp Mark A Olson Patricia M Anderson Feng Sheng Hu

Interactions between vegetation and fire have the potential to overshadow direct effects of climate change on fire regimes in boreal forests of North America. We develop methods to compare sediment-charcoal records with fire regimes simulated by an ecologica model, ALFRESCO (Alaskan Frame-based Ecosystem Code) and apply these methods to evaluate potential causes of a mid-Holocene fire-regime sh...

A. Sadoddin, M.Gh. Halili R. Mostafazadeh V. Sheikh

This research has concentrated on the physical and socio-economic impacts of vegetation-based management scenarios targeting on flooding and soil erosion issues in the Ramian watersheds. The Ramian watershed with an approximate area of 24000 ha is located in Golestan, Iran. For each sub-watershed, four biological actions (activities) and 16 management scenarios have been considered. Physical im...

2013
Y P Liu D Y Yu

The urban heat island (UHI) phenomenon has become a serious problem in recent years. It is necessary to study the mitigation methods and quantify their effects on UHI. In this paper, based on the remote sensed data, an empirical model was established as a negative function of land surface temperature (LST) to vegetation coverage. Urban heat island intensity (UHII) was estimated by a robust stat...

Journal: :Ecological applications : a publication of the Ecological Society of America 2015
Gabriel I Yospin Scott D Bridgham Ronald P Neilson John P Bolte Dominique M Bachelet Peter J Gould Constance A Harrington Jane A Kertis Cody Evers Bart R Johnson

We developed a new climate-sensitive vegetation state-and-transition simulation model (CV-STSM) to simulate future vegetation at a fine spatial grain commensurate with the scales of human land-use decisions, and under the joint influences of changing climate, site productivity, and disturbance. CV-STSM integrates outputs from four different modeling systems. Successional changes in tree species...

2012
Yueyang Jiang Qianlai Zhuang Sibyll Schaphoff Stephen Sitch Andrei Sokolov David Kicklighter Jerry Melillo

This study aims to assess how high-latitude vegetation may respond under various climate scenarios during the 21st century with a focus on analyzing model parameters induced uncertainty and how this uncertainty compares to the uncertainty induced by various climates. The analysis was based on a set of 10,000 Monte Carlo ensemble Lund-Potsdam-Jena (LPJ) simulations for the northern high latitude...

Journal: :Global change biology 2012
Boulangeat Isabelle Philippe Pauline Abdulhak Sylvain Douzet Roland Garraud Luc Lavergne Sébastien Lavorel Sandra Van Es Jérémie Vittoz Pascal Thuiller Wilfried

The pace of on-going climate change calls for reliable plant biodiversity scenarios. Traditional dynamic vegetation models use plant functional types that are summarized to such an extent that they become meaningless for biodiversity scenarios. Hybrid dynamic vegetation models of intermediate complexity (hybrid-DVMs) have recently been developed to address this issue. These models, at the cross...

2017

Vegetation models can be used to assess the impacts of climate change on future food production (i.e. farming). However, vegetation models are computationally expensive to run and to account for the uncertainty in future climate scenarios the models should, ideally, be run using as many different scenarios as possible. One way of reducing the computational cost of this procedure is to fit a sta...

2007
Eric Chown Thomas G. Dietterich

Ecological models based on physical, chemical, and biological processes are diicult to develop and calibrate. Neural network methods provide an attractive alternative where the model is constructed automatically. We compared the MAPSS global vegetation model to a collection of neural network models trained on a data set covering current climate and vegetation distribution in the coterminous Uni...

Journal: :PloS one 2016
Cintia Camila Silva Angelieri Christine Adams-Hosking Katia Maria Paschoaletto Micchi de Barros Ferraz Marcelo Pereira de Souza Clive Alexander McAlpine

A mosaic of intact native and human-modified vegetation use can provide important habitat for top predators such as the puma (Puma concolor), avoiding negative effects on other species and ecological processes due to cascade trophic interactions. This study investigates the effects of restoration scenarios on the puma's habitat suitability in the most developed Brazilian region (São Paulo State...

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