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Effects of dung and urine amendments on the isotopic content of N 2 O released from grasslands
Author(s) -
Yamulki S.,
Wolf I.,
Bol R.,
Grant B.,
Brumme R.,
Veldkamp E.,
Jarvis S. C.
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/1097-0231(20000815)14:15<1356::aid-rcm30>3.0.co;2-c
Subject(s) - chemistry , nitrous oxide , delta , flux (metallurgy) , diurnal temperature variation , morning , nitrogen , precipitation , denitrification , environmental chemistry , grassland , zoology , soil water , stable isotope ratio , atmospheric sciences , ecology , soil science , environmental science , botany , meteorology , physics , organic chemistry , quantum mechanics , geology , engineering , biology , aerospace engineering
The temporal and diurnal changes in nitrous oxide (N 2 O) fluxes were measured between 29 th September and 2 nd November 1999 from urine and dung patches from cattle deposited on grazed grassland. The δ 15 N and δ 18 O values of the N 2 O emitted from soil from both treatments were examined on four occasions during this period. The diurnal fluxes of N 2 O were measured by a chamber technique that provides hourly measurement of N 2 O fluxes. The 15 N and 18 O analysis of N 2 O were determined by isotope ratio mass spectrometry. N 2 O fluxes from the excreta patches were large, with peak emissions up to 1893 ng N m −2 s −1 occurring after heavy precipitation, measured one month after the treatment applications. Emissions from the urine patches were significantly greater than from the dung. The results showed that excretal patches are an important source of atmospheric N 2 O. The flux pattern showed a strong diurnal variation with maximum fluxes generally occurring in late afternoon or early morning, and generally not in phase with the soil temperature changes. The isotopic content of 15 N and 18 O in the N 2 O showed a similar trend to that of the N 2 O flux. The 15 N and 18 O values of the N 2 O emitted from the soil indicated that denitrification was the major process involved. After heavy precipitation on the 6 th October, the larger δ 15 N and δ 18 O values suggested a consumption of the N 2 O by total denitrification. Copyright © 2000 John Wiley & Sons, Ltd.