Strong N2O uptake capacity of paddy soil under different water conditions

• DOI: 10.1016/j.agwat.2023.108146
• Publication Date: 2023-01-13T11:21:20Z
• Authors: Jinmei Zhong; Yaqi Song; Man Yang; Wei Wang; Zhaohua Li; Liya Zhao; Kun Li; Ling Wang
• Keywords: Paddy field; Soil texture; Gravimetric analysis

Paddy field is a major global land use form. However, frequent fluctuations in soil water content make paddy fields important N2O emission sources. The contribution of uptake to the reduction net from varies with content. Nevertheless, little known about impact physicochemical factors, microbial regulatory mechanisms, and on soil. We designed conducted microcosm experiment controlled for gravimetric applied exogenous three soils differing texture parent material. During incubation period, we monitored headspace content, measured ammonia-N, nitrate-N, dissolved organic carbon analyzed number nosZ-containing microorganisms. For all soils, total was > 50.71% at 20% increased exponentially (R2 ≥ 0.96) throughout period. highest range (73.94–78.44%) detected 70% Hence, can absorb consume abundant different prolonging flooding period could enhance uptake. Furthermore, strongly positively correlated consumption increase nosZ gene abundance (P < 0.001). Under various average silty clay loam 385.20 μg•kg−1 which significantly higher than those sandy (351.98 μg•kg−1, P 0.05). Moreover, substantially SCL other soils. Future research should endeavor determine mechanisms by NH4+-N pH, affect types