نتایج جستجو برای: high vegetation

تعداد نتایج: 2095458  

1994
Jason Beringer Stuart Chapin Catharine C. Thompson David McGuire

Surface energy exchanges were measured in a sequence of five sites representing the major vegetation types in the transition from arctic tundra to forest. This is the major transition in vegetation structure in northern high latitudes. We examined the influence of vegetation structure on the rates of sensible heating and evapotranspiration to assess the potential feedbacks to climate if high-la...

2017
Kelly Elschot Anke Vermeulen Wouter Vandenbruwaene Jan P. Bakker Tjeerd J. Bouma Julia Stahl Henk Castelijns Stijn Temmerman

The relative impact of top-down control by herbivores and bottom-up control by environmental conditions on vegetation is a subject of debate in ecology. In this study, we hypothesize that top-down control by goose foraging and bottom-up control by sediment accretion on vegetation composition within an ecosystem can co-occur but operate at different spatial and temporal scales. We used a highly ...

Journal: :Remote Sensing 2010
Grant M. Casady Stuart E. Marsh

Ecosystem response to disturbance is influenced by environmental conditions at a number of scales. Changes in climate have altered fire regimes across the western United States, and have also likely altered spatio-temporal patterns of post-fire vegetation regeneration. Fire occurrence data and a vegetation index (NDVI) derived from the NOAA Advanced Very High Resolution Radiometer (AVHRR) were ...

Journal: :Remote Sensing 2023

Mid- to high-latitude Asia (MHA) is one of the regions with strongest warming trend and it also a region where ecosystems are most sensitive climate variability. However, how vegetation in will change future remains uncertain. Using observation-based Leaf Area Index (LAI) meteorological data multiple regression method, this study analyzes response MHA elements during 1982–2020. Then, machine le...

2011
Michael J. H. Hickford David R. Schiel

Anthropogenic impacts, including urbanization, deforestation, farming, and livestock grazing have altered riparian margins worldwide. One effect of changes to riparian vegetation is that the ground-level light, temperature, and humidity environment has also been altered. Galaxias maculatus, one of the most widely distributed fishes of the southern hemisphere, lays eggs almost exclusively beneat...

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...

2013
DANIEL G. GAVIN LINDA B. BRUBAKER D. NOAH GREENWALD

The mode and tempo of forest compositional change during periods of rapid climate change, including the potential for the fire regime to produce nonlinear relationships between climate and vegetation, is a long-standing theme of forest ecological research. In the old conifer forests of the coastal Pacific Northwest, fire disturbances are sufficiently rare that their relation to climate and thei...

2010
Timothy B. Harrington Stephen H. Schoenholtz

Although considerable research has focused on the influences of logging debris treatments on soil and forest regeneration responses, few studies have identified whether debris effects are mediated by associated changes in competing vegetation abundance. At sites near Matlock, Washington, and Molalla, Oregon, studies were initiated after timber harvest to quantify the effects of three logging de...

Journal: :Remote Sensing 2015
Linlin Lu Claudia Kuenzer Cuizhen Wang Huadong Guo Qingting Li

Understanding the spatial and temporal dynamics of vegetation is essential in drylands. In this paper, we evaluated three vegetation indices, namely the Normalized Difference Vegetation Index (NDVI), the Soil-Adjusted Vegetation Index (SAVI) and the Enhanced Vegetation Index (EVI), derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) Surface-Reflectance Product in the Xinjiang...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2014
R J V Alves N G Silva J A Oliveira D Medeiros

Currently campo rupestre (CR) is a name accepted and used internationally by botanists, zoologists, and other naturalists, usually applied to a very specific ecosystem, despite the lack of a consensual published circumscription. We present a tentative geographic circumscription of the term, combining data on climate, geology, geomorphology, soil, flora, fauna and vegetation. The circumscription...

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