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Nitrogen oxides and nitrous oxide fl...

Walsh, Margaret Karen.

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Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity./
作者:	Walsh, Margaret Karen.
面頁冊數:	65 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 1340.
Contained By:	Dissertation Abstracts International63-01B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3038665
ISBN:	9780493516066

Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity.
Walsh, Margaret Karen.

Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity. - 65 p.

Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 1340.

Thesis (Ph.D.)--Colorado State University, 2001.

This item must not be sold to any third party vendors.

Chinese agriculture represents one of the most intensively managed and biogeochemically important ecosystems in the world. High fertilizer application rates and poor nutrient use efficiency by crops result in high nitrogen losses to the surrounding environment, with consequences to atmospheric composition, groundwater quality, public health, and ironically, agriculture itself. One loss mechanism, the gaseous production of NOx and N 2O is examined here.

ISBN: 9780493516066Subjects--Topical Terms:

545717
Biogeochemistry.

Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity.
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245 1 0 $a Nitrogen oxides and nitrous oxide fluxes in an upland agroecosystem of the north China plain: Field measurements, biogeochemical simulation, and climatic sensitivity.
300 $a 65 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 1340.
500 $a Advisers: David S. Schimel; Dennis S. Ojima.
502 $a Thesis (Ph.D.)--Colorado State University, 2001.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Chinese agriculture represents one of the most intensively managed and biogeochemically important ecosystems in the world. High fertilizer application rates and poor nutrient use efficiency by crops result in high nitrogen losses to the surrounding environment, with consequences to atmospheric composition, groundwater quality, public health, and ironically, agriculture itself. One loss mechanism, the gaseous production of NOx and N 2O is examined here.
520 $a Flux measurements revealed seasonal emission factors of 1.24% and 0.22% of added nitrogen for NOx and N2O, respectively. An unequivocal relationship between the amount of added nitrogen and the magnitude of gaseous efflux was evident. A relationship to organic matter amendment, whose proportions have been steadily declining in China, was significant only for N2O. Relative seasonal fluxes were lower than those determined by other authors, possibly the result of particularly high ammonia volatilization under Chinese management regimes.
520 $a Mathematical simulations with the biogeochemical model DAYCENT adequately represented the temporal dynamic and peak size of measured fluxes. Ammonia volatilization levels were important considerations in comparing measured versus simulated trace gas fluxes. DAYCENT tended to underestimate the number of very small fluxes, however overall seasonal fluxes were similar for measured versus simulated fluxes.
520 $a In response to sensitivity to the climatic variables of temperature and precipitation, standard biogeochemical diagnostics including soil carbon, organic soil nitrogen, grain yield, net primary productivity, and actual evapotranspiration behave according to expectations. Emissions of NO and N2O, however, show a complex and nonlinear response, reflecting interactions and fluctuations within the many driving parameters of trace gas production.
590 $a School code: 0053.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Ecology. $3 516476
650 4 $a Agronomy. $3 2122783
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710 2 $a Colorado State University. $3 675646
773 0 $t Dissertation Abstracts International $g 63-01B.
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792 $a 2001
793 $a English
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