TITLE:
Effect of Vertical Distribution of Soil Water on N2O Emission under Drip Irrigation
AUTHORS:
Weihan Wang
KEYWORDS:
Drip Irrigation, N2O, Emissions, Soil Moisture, Vertical Distribution
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.12,
December
27,
2018
ABSTRACT: N2O emission has obvious water effect, but the current research is not deep
enough. The soil wetting mode of drip irrigation technology is obviously different
from that of conventional irrigation. Using the method of soil box indoor
simulation, the N2O emission under different soil vertical water content
was analyzed. Hydrus Software was used to simulate the soil wetting body
under different drip irrigation technical parameters, the relationship between
the combination of drip irrigation technical parameters and soil vertical water
content was studied, and then the relationship between the N2O emission and
the combination of drip irrigation technical parameters was proposed. The
results showed that soil N2O emission flux increased with the increase of soil
moisture, and the maximum emission flux was three times as much as the
minimum emission flux. Under the condition of uniform distribution of soil
moisture, soil N2O emission flux was smaller than that under non-uniform
distribution of soil moisture. Hydrus software simulation results show that
drip flow rate is 2.0 L/h, the irrigation period is 5 days, the irrigation quota is
12 mm, and the soil N2O emission flux is the largest. Adjusting the combination
of technical parameters of drip irrigation can reduce soil N2O emission
flux.