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Effects of soil temperature on nitric oxide emission from a typical Chinese rice–wheat rotation during the non‐waterlogged period
Author(s) -
ZHENG XUNHUA,
HUANG YAO,
WANG YUESI,
WANG MINGXING,
JIN JISHENG,
LI LAOTU
Publication year - 2003
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1046/j.1365-2486.2003.00610.x
Subject(s) - diurnal temperature variation , arrhenius equation , atmospheric sciences , water content , environmental science , nitrous oxide , soil science , emission intensity , activation energy , chemistry , materials science , physics , photoluminescence , geology , geotechnical engineering , organic chemistry , optoelectronics
Measurements of nitric oxide (NO) emission from a typical Chinese rice–wheat rotation are continuously made during the non‐waterlogged period by using an automatic system based on static chamber techniques. A positive correlation exists between NO emission and soil moisture content when surface soil temperature is > 20 °C. The diurnal variability in NO emission is characterized with day‐peak, night‐peak and irregular patterns, which are in close association with wheat growth. The diurnal NO emission under the day‐peak pattern is correlated with the simultaneously observed surface soil temperature, whereas that under the night‐peak and irregular pattern is dependent on surface soil temperature at 7 ± 2 and 3 ± 2 h before NO observation, respectively. The effect of soil temperature on NO emission is well described by F = α·e β ·T , where F is NO flux, T soil temperature, and α and b empirical coefficients. The parameter Q 10 ; that is, the change in NO emission per 10 °C soil temperature, is correlated with the rates of fertilizer‐N application. An approach orientated from the Arrhenius equation, , is developed in order to predict diurnal NO emission, where T K is the daily average soil temperature, Δ T K the deviation of soil temperature from the daily average, E a the apparent activation energy, R the gas constant, t a given time within the one‐day cycle, t delayed time for appearance of the diurnal NO emission peak, and k an empirical coefficient. Based on the results, the authors recommend that intermittent measurement of NO emission from a similar ecosystem would be best taken around 17:00. The molar ratio of NO/N 2 O over the non‐waterlogged period is > 1 when soil moisture content was less than the field capacity, suggesting that NO emission was mainly derived from nitrification under this condition.