Title :
Study on the Nitrous Oxide Emission and Denitrification Losses from Loess Plateau under Different Water Regimes and Nitrogen Fertilizer Rates
Author :
Li Wei ; Zhang Guoming ; Li Zhaojun
Author_Institution :
Sch. of Resource & Environ., Shanxi Univ., Taiyuan
Abstract :
A middle- term laboratory research was performed by monitoring three types of loess soils of NH4+ and NO3- dynamics and N2O production and denitrification. Results showed that there were no significant differences in the total amount of N2O production and denitrification loss over 22 day between fertilized and unfertilized soils. This study also indicated that soil moisture had significant effect on N2O production and denitrification loss. From 80% to 110% WFPS, the amounts of N2O production and denitrification loss increased by 16-41 and 17-22 folds, respectively. The maximum N2O emission rates and denitrification rates from all treatments occurred after rewetting of dry soil. The peaks maintained transitorily in the two clay loess soils, however, the higher fluxes remained for several days in sandy loess soil. The total N2O production and denitrification from the sandy loess soil were significantly higher than that from clay loess soils. Soil moisture could be the most important factor controlling N2O emissions and denitrification loss when a rich N supply existed in soil.
Keywords :
fertilisers; soil; soil pollution; denitrification losses; loess plateau; loess soils; nitrogen fertilizer; nitrous oxide emission; water regimes; Atmosphere; Atmospheric measurements; Fertilizers; Nitrogen; Polyethylene; Production; Rubber; Soil moisture; Temperature; Water resources; N2O; denitrification loss; loess soil; urea-N; water content;
Conference_Titel :
Education Technology and Training, 2008. and 2008 International Workshop on Geoscience and Remote Sensing. ETT and GRS 2008. International Workshop on
Conference_Location :
Shanghai
Print_ISBN :
978-0-7695-3563-0
DOI :
10.1109/ETTandGRS.2008.30