Keyphrases
Grand Canyon National Park
100%
Semi-arid
100%
Roadside
100%
Vehicular Emissions
100%
Roadside Habitat
100%
N Deposition
57%
Pion
28%
Foliage
28%
Nitrogen Oxides
28%
N Enrichment
28%
15N Natural Abundance
28%
Passive Air Sampler
28%
Vehicle Emissions
28%
Direct Measurement
14%
Protected Areas
14%
Management Decisions
14%
NO3-N
14%
Ammonium Ion
14%
Inorganic N
14%
Ecological Communities
14%
Pollution
14%
Atmospheric Nitrogen
14%
Nutrient Pools
14%
Roadway
14%
Plant nutrients
14%
Pine Tree
14%
Traffic Density
14%
Traffic Volume
14%
Low Traffic
14%
N Input
14%
Ecological Indicators
14%
Potential Indicators
14%
Traffic Level
14%
N Pollution
14%
N Emissions
14%
Cost-effective Approach
14%
Ogawa Sampler
14%
Pine Needles
14%
Clean Air Act
14%
Concentration of Nitrogen Oxides
14%
Non-point Source
14%
Roadside Environment
14%
Roadside Pollution
14%
Ecological Integrity
14%
Air Quality Standards
14%
Earth and Planetary Sciences
Emissions
100%
National Parks
100%
Nitrogen Oxide
42%
Traffic Emission
28%
Protected Area
14%
Atmospherics
14%
Ecological Community
14%
Ecological Indicator
14%
Air Quality
14%
Quality Standard
14%
Roadside Environment
14%
Nonpoint Source
14%
Agricultural and Biological Sciences
National Parks
100%
Canyons
100%
Nitrogen Oxide
42%
Pinus
28%
Annuals
14%
Protected areas
14%
Air Quality
14%