Effects of Soil Temperature, Flooding, and Organic Matter Addition on N₂O Emissions from a Soil of Hongze Lake Wetland, China

Abstract

The objectives of this study were to test the effects of soil temperature, flooding, and raw organic matter input on N2O emissions in a soil sampled at Hongze Lake wetland, Jiangsu Province, China. The treatments studied were—peat soil (I), peat soil under flooding (II), peat soil plus raw organic matter (III), and peat soil under flooding plus organic matter. These four treatments were incubated at 20°C and 35°C. The result showed that temperature increase could enhance N2O emissions rate and cumulative emissions significantly; moreover, the flooded soil with external organic matter inputs showed the lowest cumulative rise in N2O emissions due to temperature increment. Flooding might inhibit soil N2O emissions, and the inhibition was more pronounced after organic matter addition to the original soil. Conversely, organic matter input explained lower cumulative N2O emissions under flooding. Our results suggest that complex interactions between flooding and other environmental factors might appear in soil N2O emissions. Further studies are needed to understand potential synergies or antagonisms between environmental factors that control N2O emissions in wetland soils.

N<sub>2</sub>O fluxes from the littoral zone of a Chinese reservoir

“…grassland and farmland), the environment of the littoral zone is more diverse and dynamic in terms of soil moisture, plant species and soil nutrients across scales of both space and time (Peng et al, 2011;Ahn et al, 2014;Trost et al, 2013). These variables may be expected to influence N 2 O production (Lu and Xu, 2014). Limited previous studies on N 2 O emissions of the littoral zone suggested significant spatio-temporal variations.…”

The impact of tillage intensity and meteorological conditions on soil temperature, moisture content and CO2 effluxin maize and spring barley cultivation

“…There has been found a relationship between soil temperature and CO 2 and NO 2 efflux: with increasing soil temperature, the efflux of these gases into the atmosphere increase as well. Thus, this effect becomes a positive feedback in the climate system (Haei et al, 2013;Lu, Xu, 2014;Albergel et al, 2015). The changes in soil temperature and evaporation are conditioned by the heat efflux in it.…”

Dirvožemio terminis režimas Lietuvoje

“…Nustatyta, kad dirvožemio temperatūra turi ryšį su CO 2 ir NO 2 emisija: šylant dirvožemiui šių dujų išskyrimas į atmosferą didėja. Taigi šis efektas tampa teigiamu grįž tamuoju ryšiu klimato sistemoje (Haei ir kt., 2013;Lu, Xu, 2014; Albergel ir kt., 2015).…”

“…Nustatyta, kad dirvožemio temperatūra turi ryšį su CO 2 ir NO 2 emisija: šylant dirvožemiui šių dujų išskyrimas į atmosferą didėja. Taigi šis efektas tampa teigiamu grįž tamuoju ryšiu klimato sistemoje (Haei ir kt., 2013;Lu, Xu, 2014; Albergel ir kt., 2015).Dirvožemio terminis režimas itin svarbus ro diklis žemės ūkiui. Vidutinėse ir aukštosiose pla tumose augalams svarbus vasarą dirvožemyje su kaupiamos šilumos kiekis, o rudenį ir žiemą -įšalo…”