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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Global Trends In Seasonality Of Normalized Difference Vegetation Index (Ndvi), 1982–2011, J. Ronald Eastman, Florencia Sangermano, Elia Axinia Machado, John Rogan, Assaf Anyamba
Global Trends In Seasonality Of Normalized Difference Vegetation Index (Ndvi), 1982–2011, J. Ronald Eastman, Florencia Sangermano, Elia Axinia Machado, John Rogan, Assaf Anyamba
Publications and Research
A 30-year series of global monthly Normalized Difference Vegetation Index (NDVI) imagery derived from the Global Inventory Modeling and Mapping Studies (GIMMS) NDVI3g archive was analyzed for the presence of trends in changing seasonality. Using the Seasonal Trend Analysis (STA) procedure, over half (56.30%) of land surfaces were found to exhibit significant trends. Almost half (46.10%) of the significant trends belonged to three classes of seasonal trends (or changes). Class 1 consisted of areas that experienced a uniform increase in NDVI throughout the year, and was primarily associated with forested areas, particularly broadleaf forests. Class 2 consisted of areas experiencing …
Comparing Forest Measurements From Tree Rings And A Space-Based Index Of Vegetation Activity In Siberia, Andrew Godard Bunn, Malcolm Kenneth Hughes, Alexander V. Kirdyanov, Mark Losleben, Vladimir V. Shishov, Logan T. Berner, Alexander Oltchev, E. A. (Evgeniĭ Aleksandrovich) Vaganov
Comparing Forest Measurements From Tree Rings And A Space-Based Index Of Vegetation Activity In Siberia, Andrew Godard Bunn, Malcolm Kenneth Hughes, Alexander V. Kirdyanov, Mark Losleben, Vladimir V. Shishov, Logan T. Berner, Alexander Oltchev, E. A. (Evgeniĭ Aleksandrovich) Vaganov
Environmental Sciences Faculty and Staff Publications
Different methods have been developed for measuring carbon stocks and fluxes in the northern high latitudes, ranging from intensively measured small plots to space-based methods that use reflectance data to drive production efficiency models. The field of dendroecology has used samples of tree growth from radial increments to quantify long-term variability in ecosystem productivity, but these have very limited spatial domains. Since the cambium material in tree cores is itself a product of photosynthesis in the canopy, it would be ideal to link these two approaches. We examine the associations between the normalized differenced vegetationindex (NDVI) and tree growth using …
Optimal Placement Of Off-Stream Water Sources For Ephemeral Stream Recovery, Matthew Rigge, Alexander Smart, Bruce Wylie
Optimal Placement Of Off-Stream Water Sources For Ephemeral Stream Recovery, Matthew Rigge, Alexander Smart, Bruce Wylie
Natural Resource Management Faculty Publications
Uneven and/or inefficient livestock distribution is often a product of an inadequate number and distribution of watering points.Placement of off-stream water practices (OSWP) in pastures is a key consideration in rangeland management plans and is criticalto achieving riparian recovery by improving grazing evenness, while improving livestock performance. Effective OSWPplacement also minimizes the impacts of livestock use radiating from OSWP, known as the ‘‘piosphere.’’ The objective of thisstudy was to provide land managers with recommendations for the optimum placement of OSWP. Specifically, we aimed toprovide minimum offset distances of OSWP to streams and assess the effective range of OSWP using Normalized …