College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China.
Environ Pollut. 2018 Apr;235:625-631. doi: 10.1016/j.envpol.2017.12.066. Epub 2018 Jan 11.
Several studies have been carried out to examine nitrous oxide (NO) emissions from agricultural soils in the past. However, the emissions of NO particularly during amelioration of acidic soils have been rarely studied. We carried out the present study using a rice-rapeseed rotation soil (pH 5.44) that was amended with dolomite (0, 1 and 2 g kg soil) under 60% water filled pore space (WFPS) and flooding. NO emissions and several soil properties (pH, NHN, NO-N, and nosZ gene transcripts) were measured throughout the study. The increase in soil pH with dolomite application triggered soil N transformation and transcripts of nosZ gene controlling NO emissions under both water regimes (60% WFPS and flooding). The 60% WFPS produced higher soil NO emissions than that of flooding, and dolomite largely reduced NO emissions at higher pH under both water regimes through enhanced transcription of nosZ gene. The results suggest that ameliorating soil acidity with dolomite can substantially mitigate NO emissions through promoting nosZ gene transcription.
过去已经进行了多项研究来考察农业土壤中一氧化二氮（NO）的排放。然而，在酸性土壤改良过程中，NO 的排放特别是很少被研究。本研究使用一种水稻-油菜轮作土壤（pH 值为 5.44），在 60%水分充填满孔空间（WFPS）和淹水条件下，用白云石（0、1 和 2 g/kg 土壤）进行了处理。在整个研究过程中，测量了 NO 排放和几种土壤特性（pH 值、NHN、NO-N 和 nosZ 基因转录本）。随着白云石的应用，土壤 pH 值的增加触发了土壤氮转化和控制 NO 排放的 nosZ 基因的转录，这两种水情（60% WFPS 和淹水）下都是如此。在 60% WFPS 条件下，土壤 NO 排放高于淹水条件，而在两种水情下，白云石通过增强 nosZ 基因的转录，在较高 pH 值下大大减少了 NO 的排放。研究结果表明，用白云石改良土壤酸度可以通过促进 nosZ 基因的转录来显著减少 NO 的排放。
