14 research outputs found
Long-term nutrient addition increased CH4 emission from a bog through direct and indirect effects
Peatlands are globally significant sources of atmospheric methane (CH4). While several studies have examined the effects of nutrient addition on CH4 dynamics, there are few long-term peatland fertilization experiments, which are needed to understand the aggregated effects of nutrient deposition on ecosystem functioning. We investigated responses of CH4 flux and production to long-term field treatments with three levels of N (1.6-6.4 g m-2 yr-1 as NH4NO3), potassium and phosphorus (PK, 5.0 g P and 6.3 g K m-2 yr-1 as KH2PO4), and NPK in a temperate bog. Methane fluxes were measured in the field from May to August in 2005 and 2015. In 2015 CH4 flux was higher in the NPK treatment with 16 years of 6.4 g N m-2 yr-1 than in the control (50.5 vs. 8.6 mg CH4 m-2 d-1). The increase in CH4 flux was associated with wetter conditions derived from peat subsidence. Incubation of peat samples, with and without short-term PK amendment, showed that potential CH4 production was enhanced in the PK treatments, both from field application and by amending the incubation. We suggest that changes in this bog ecosystem originate from long-term vegetation change, increased decomposition and direct nutrient effects on microbial dynamics
Photoelastic analysis input into the design of an exfoliation specimen
NRC publication: Ye
Preprocessing of Edge of Light Images: Towards A Quantitative Evaluation
Peer reviewed: YesNRC publication: Ye
EFFECT OF EXFOLIATION CORROSION ON THE STRUCTURAL INTEGRITY OF 7075-T6 UPPER WING SKINS - Abstract Only
Peer reviewed: YesNRC publication: Ye
PROTOTYPE INSTALLATION OF A SURFACE MOUNTABLE CRACK SENSOR - abstract only
NRC publication: Ye
Crack Detection on Composite and Metallic Aerospace Structures - Abstract Only
Peer reviewed: YesNRC publication: Ye
EFFECT OF EXFOLIATION CORROSION ON THE STRUCTURAL INTEGRITY OF 7075-T6 UPPER WING SKINS - FULL PAPER
Peer reviewed: YesNRC publication: Ye
Quantifying Surface Deformation with An Enhanced Visual Inspection: Edge of Light
NRC publication: Ye
Effects of Ultrasonic Impact Surface Treatment on Exfoliated Aluminum Alloys - ABSTRACT ONLY
Peer reviewed: YesNRC publication: Ye