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Full-Text Articles in Environmental Sciences
Defoliation Severity Is Positively Related To Soil Solution Nitrogen Availability And Negatively Related To Soil Nitrogen Concentrations Following A Multi-Year Invasive Insect Irruption, Emma Conrad-Rooney, Audrey Barker Plotkin, Valerie J. Pasquarella, Joseph Elkinton, Jennifer L. Chandler, Jaclyn Hatala Matthes
Defoliation Severity Is Positively Related To Soil Solution Nitrogen Availability And Negatively Related To Soil Nitrogen Concentrations Following A Multi-Year Invasive Insect Irruption, Emma Conrad-Rooney, Audrey Barker Plotkin, Valerie J. Pasquarella, Joseph Elkinton, Jennifer L. Chandler, Jaclyn Hatala Matthes
Environmental Conservation Faculty Publication Series
Understanding connections between ecosystem nitrogen (N) cycling and invasive insect defoliation could facilitate the prediction of disturbance impacts across a range of spatial scales. In this study we investigated relationships between ecosystem N cycling and tree defoliation during a recent 2015–18 irruption of invasive gypsy moth caterpillars (Lymantria dispar), which can cause tree stress and sometimes mortality following multiple years of defoliation. Nitrogen is a critical nutrient that limits the growth of caterpillars and plants in temperate forests. In this study, we assessed the associations among N concentrations, soil solution N availability and defoliation intensity by L. dispar …
Near-Real-Time Monitoring Of Insect Defoliation Using Landsat Time Series, Valerie J. Pasquarella, Bethany A. Bradley, Curtis E. Woodcock
Near-Real-Time Monitoring Of Insect Defoliation Using Landsat Time Series, Valerie J. Pasquarella, Bethany A. Bradley, Curtis E. Woodcock
Environmental Conservation Faculty Publication Series
Introduced insects and pathogens impact millions of acres of forested land in the United States each year, and large-scale monitoring efforts are essential for tracking the spread of outbreaks and quantifying the extent of damage. However, monitoring the impacts of defoliating insects presents a significant challenge due to the ephemeral nature of defoliation events. Using the 2016 gypsy moth (Lymantria dispar) outbreak in Southern New England as a case study, we present a new approach for near-real-time defoliation monitoring using synthetic images produced from Landsat time series. By comparing predicted and observed images, we assessed changes in vegetation …