نتایج جستجو برای: ecosystem cycles
تعداد نتایج: 171643 فیلتر نتایج به سال:
[1] Soil surface temperature is a critical boundary condition for the simulation of soil temperature by environmental models. It is influenced by atmospheric and soil conditions and by vegetation cover. In sophisticated land surface models, it is simulated iteratively by solving surface energy budget equations. In ecosystem, permafrost, and hydrology models, the consideration of soil surface te...
We use a simple model of ecosystem management to demonstrate that apparently rational management approaches can lead to ecological collapse. Our model of the ecosystem management of lake eutrophication integrates lake dynamics, management decision-making, and learning in a framework that is deliberately simplified to highlight the role of model uncertainty. The simulated lake can switch between...
Introduction: Urban soils are large pools of carbon, nitrogen, and other elements, supporting plant growth, sustaining biogeochemical cycles, and serving as the foundation for maintaining ecosystem function and services of urban green spaces (UGS). Quantifying urban soil properties is essential for assessing urban ecosystem services and detecting pollution. Characterizing spatial heterogeneity ...
Ecosystem analysis has established nutrient cycling as an important area of ecology involving biological, chemical, and geological interactions. Studying the flow of elements through ecosystems provides us with a tool for understanding the functioning of ecosystems. For example, if an ecosystem component has a rapid flux of elements through it, or if it stores large amounts of an element, that ...
Ecosystem models are useful tools for evaluating environmental controls on carbon and water cycles under past or future conditions. In this paper we compare annual carbon and water fluxes from nine boreal spruce forest ecosystem models in a series of sensitivity simulations. For each comparison, a single climate driver or forest site parameter was altered in a separate sensitivity run. Driver a...
The searching efficiency of predators depends on the balance between adaptations predator and counter-adaptations prey. In this evolutionary race, prey should normally have upper hand, as it can perform tradeoffs in resource use ability to avoid predators. terrestrial predator–herbivore systems, however, huge difference food quality seems give an advantage. productive ecosystems, thus chronical...
Fr ed eric Barraquand, Stilianos Louca, Karen C. Abbott, Christina A. Cobbold, Flora Cordoleani, Donald L. DeAngelis, Bret D. Elderd, Jeremy W. Fox, Priscilla Greenwood, Frank M. Hilker, Dennis L. Murray, Christopher R. Stieha, Rachel A. Taylor, Kelsey Vitense, Gail S.K. Wolkowicz and Rebecca C. Tyson Abstract Population cycling is a widespread phenomenon, observed across a multitude of taxa in...
Abstract Black-tailed prairie dogs (Cynomys ludovicianus) exhibit boom and bust cycles in landscapes where they are affected by outbreaks of plague caused the introduced bacterium Yersinia pestis. We examined spatiotemporal dynamics black-tailed dog colonies Thunder Basin National Grassland, Wyoming over a period 21 years. The colony complex experienced three epizootics during that time, conseq...
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