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Renumeration
Renumeration

... In late September, 2007, soil samples from the top 10cm of the soil profile were obtained from three different agroecosystems and a natural ecosystem located in Unity, Maine (Colby Biology Dept., 2007A). A total of twelve replicate samples were obtained from each ecosystem. Four of the silage corn s ...
Clash of Classes Review Ecology 2014 2015.notebook
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... D carrying capacity 19 What must occur in a population for it to grow? A The birthrate becomes higher than the death rate B The birthrate stays the same and the death rate increases C The birthrate becomes lower than the death rate D The birthrate and the death rate remain the same 20 Which are two  ...
2. Ecology - Deepwater.org
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... c. Abiotic factors: nonliving factors - air, temperature, water, light, soil ...
Managing Agricultural Greenhouse Gases Brochure
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Ecology Unit AP Biology

... 2. Define and compare gross primary production, net primary production, and standing crop. 3. Explain why energy flows but nutrients cycle within an ecosystem. 4. Explain what factors may limit primary production in aquatic ecosystems. 5. Distinguish between the following pairs of terms; primary and ...
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Biodiversity Risks from Fossil Fuel Extraction

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NATIONAL 5 BIOLOGY Life on Earth
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... in mid-June 1998. The above species were selected for the experiment because they are the most abundant submersed vascular plant species occurring in freshwater marshes near the Great Salt Lake, Utah (Cox and Kadlec 1995). Potamogeton pectinatus tubers were bought from a nursery in Wisconsin (Kester ...
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Ecology of Ecosystems
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... activities is as important as the changes wrought by natural processes. Human agricultural practices, air pollution, acid rain, global deforestation, overshing, eutrophication, oil spills, and illegal dumping on land and into the ocean are all issues of concern to ecologists and conservationists. ...
NATIONAL 5 BIOLOGY Life on Earth
NATIONAL 5 BIOLOGY Life on Earth

... Species produce more offspring than the environment can support due to the limited resources available. A struggle for survival then takes place as they compete for these limited resources. Differences exist between members of a population – this is called variation. Those organisms which are best s ...
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Human impact on the nitrogen cycle



Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.
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