منابع مشابه
Nitrogen saturation in stream ecosystems.
The concept of nitrogen (N) saturation has organized the assessment of N loading in terrestrial ecosystems. Here we extend the concept to lotic ecosystems by coupling Michaelis-Menten kinetics and nutrient spiraling. We propose a series of saturation response types, which may be used to characterize the proximity of streams to N saturation. We conducted a series of short-term N releases using a...
متن کاملNitrogen cycling and nitrogen saturation in temperate forest ecosystems.
The last decade has seen a dramatic shift in the focus of nitrogen cycling research in forest ecosystems. Concerns over nitrogen deficiencies and effects of removal in harvest have given way to concerns over excess nitrogen availability and the potential for forest decline and surface water pollution. Driving this paradigm shift is the increase in atmospheric deposition of nitrogen to forests d...
متن کاملNitrogen Saturation in Temperate Forest Ecosystems Hypotheses revisited
N itrogen emissions to the atmosphere due to human ace tivity remain elevated in industrialized regions of the world and are accelerating in many developing regions (Galloway 1995). Although the deposition of sulfur has been reduced over much of the United States and Europe by aggressive environmental protection policies, current nitrogen deposition reduction targets in the US are modest. Nitro...
متن کاملNitrogen Uptake, Retention and Cycling in Stream Ecosystems: An Intersite N-15 Tracer Experiement
II. BACKGROUND, RESEARCH OBJECTIVES AND SIGNIFICANCE A. Nitrogen cycling in streams Nitrogen is an element of considerable interest in lotic ecosystems. It limits productivity in some flowing waters (e. g. Grimm and Fisher 1986), while in others it is present to such excess that legislators have called for a 50% reduction by the year 2000 ( Haycock et al. 1993). In the U. S. nitrogen loading ha...
متن کاملHabitat saturation drives thresholds in stream subsidies.
Understanding how abundance regulates the effects of organisms on their ecosystems remains a critical goal of ecology, especially for understanding inter-ecosystem transfers of energy and nutrients. Here we examined how territoriality and nest-digging by anadromous salmon mediate trophic subsidies to stream fishes. Salmon eggs become available for consumption primarily by the digging of salmon ...
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ژورنال
عنوان ژورنال: Ecology
سال: 2006
ISSN: 0012-9658
DOI: 10.1890/0012-9658(2006)87[3140:nsise]2.0.co;2