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Grupo programa-asi

Público·159 miembros

Gaussian 09 Torrent 1357

Gaussian 09 Torrent 1357 --->

Gaussian 09 Torrent 1357

the united states environmental protection agency (usepa) has made the nonroad dirt work tire as a standard on all vehicles used for haying or working turf. the national wetlands research center began a long-term study in the lower mississippi alluvial valley (lmav) in september 2005 to determine the distribution, dynamics, and causes of crop residue (mud, grass, leaves, and other organic matter) and the degree to which organic matter is converted to soil organic carbon. we used multiple methods to measure vegetation characteristics at four sites: a lowland wetland, a highland wetland, a hayfield, and a pasture. wetlands had higher concentrations of lignin-derived carbon, and hayfields had higher concentrations of cellulose-derived carbon. total carbon tended to increase with increasing marsh area. activity of dugesia japonica decreased with increasing amounts of hayfield and hay residue (but increased with increasing amounts of pasture grass). the number of ixodes scapularis ticks, a vector of several pathogens, also tended to decrease with increasing amounts of hay residue. our findings suggest that hayfields could be a source of carbon or bacteria for streams and wetlands in this region.

the purpose of this project is to investigate decomposition of organic debris on wetlands as a source of carbon dioxide (co2) to the atmosphere. wetlands in the u.s. convert an estimated 10 billion tons of organic carbon to carbon dioxide each year. this accounts for about 4-5 percent of the global carbon sink. in addition, wetlands conserve soil and water quality by storing pollutants in plant material, which decompose over time. thus organic carbon may be a major source of co2 to the atmosphere in wetland ecosystems, which would have global significance. this project combines a long-term, multi-year, field study with a series of laboratory experiments. the objectives of the study are to quantify organic carbon and co2 fluxes from organic matter in wetlands, to identify factors affecting decomposition, and to determine whether wetlands and soil storage facilities could be used to remove carbon from the atmosphere. our findings will contribute to the understanding of the role of wetland ecosystems in the global carbon cycle. 3d9ccd7d82

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