Positive feedbacks to anthropogenic nitrogen deposition in Rocky Mountain alpine tundra

Article Abstract:

Anthropogenic deposition of nitrogen in the Rocky Mountain region is interfering with naturally occurring nitrogen cycles. Alpine tundra is particularly susceptible to alterations of nitrogen cycles due to its lower biological capacity. These alterations can lead to plant species changes through competitive displacement, which will provide positive feedback to further nitrogen increases and in turn affect groundwater ecosystems.

United States, Water, Nitrogen (Chemical element), Water chemistry, Soils, Soil nitrogen, Nitrogen cycle

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Litter effects of two co-occurring alpine species on plant growth, microbial activity and immobilization of nitrogen

Article Abstract:

The effects of the litter from the two co-dominant alpine species, Acomastylis rossii and Deschampsia caespitosa, on microbial respiration and immobilization of N, in two separate laboratory microcosm experiments and in the field are given. The results indicate that Acomastylis litter influences soil N cycling by increasing microbial activity and N immobilization that influence N supply to neighboring plants.

Science & research, Plants, Plants (Organisms), Growth, Microbiology, Plant ecology, Company growth

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Biotic controls over ecosystem response to environmental change in alpine tundra of the Rocky Mountains

Article Abstract:

Research is presented on the influence of atmospheric pollution on primary production, nitrogen deposition, vegetation dynamics and nutrient cycling in alpine tundra ecology. Plant species abundance is the category most affected by pollution-induced climate change, which in turn may have more of an impact on ecosystem functions than the direct impact of climate change.

Colorado, Statistical Data Included, Human beings, Human-environment interactions, Climatic changes, Climate change, Mountains, Tundra ecology, Mountain ecology, Tundras, Alpine ecosystems

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