Resources and Environment College, Southwest University, No.1 Tiansheng Road, Chongqing, 400716, China.
Institute of New Rural Development, Guizhou University, Huaxi District, Guiyang, 550025, China.
Environ Sci Pollut Res Int. 2018 Oct;25(29):29096-29103. doi: 10.1007/s11356-018-2875-4. Epub 2018 Aug 15.
Ammonium (NH) in biogas slurries is readily nitrified into very mobile soil nitrate (NO) to promote nitrogen (N) leaching concerning which a few studies, however, have been reported. These slurries are regularly applied through irrigation to purple soil in the Three Gorges Reservoir Area, and therefore we explored the consequent N leaching there with a plot experiment. Biogas slurry irrigation was carried out with nitrogen application rates of 0, 48, 144, 240, 336, and 480 kg N/ha. As a result, the last two rates have triggered N leaching being detrimental to groundwater safety. In addition, N leaching was negatively correlated with soil microbial biomass, diversity, and respiration, indicating a potential technique to prevent it with soil heterotrophs activated by increased ratios of carbon to nitrogen (C/N) in biogas slurries.
沼气液中的氨（NH）很容易被硝化成为非常易移动的土壤硝酸盐（NO），从而促进氮（N）的淋失，尽管已有一些相关研究，但报道很少。这些沼液经常通过灌溉的方式应用于三峡库区的紫色土中，因此我们通过田间试验来探索由此产生的氮淋失情况。沼气液灌溉的氮施用量分别为 0、48、144、240、336 和 480 kg N/ha。结果表明，后两个施用量导致了氮淋失，对地下水安全构成威胁。此外，氮淋失与土壤微生物生物量、多样性和呼吸呈负相关，表明可以通过增加沼气液中碳氮比（C/N）来激活土壤异养生物，从而防止氮淋失，这是一种潜在的技术。
