Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan.
College of Resources and Environment, Huazhong Agricultural University, Wuhan, China.
Environ Pollut. 2019 Dec;255(Pt 1):113237. doi: 10.1016/j.envpol.2019.113237. Epub 2019 Sep 13.
Nitrous oxide (NO) is a devastating greenhouse gas mainly released from soils to the atmosphere. Pasture soils, particularly acidic in nature, are large contributors of atmospheric NO through deposition of urine-N. Devising strategies for reducing NO emissions in acidic soils are the utmost need of the time. Therefore, the present study was carried out to investigate the possible efficacy of dolomite application to reduce NO emissions from urine treated acidic soil. Application of urine to soil enlarged the production of NH-N, NO-N, microbial biomass C (MBC) and dissolved organic C (DOC), resulting in higher NO emissions as compared to the control (soil only). The highest NO emission rate (1.35 μg NO-N kg h) and cumulative flux (408 μg NO-N kg) occurred in urine only treated soil. Dolomite addition, especially higher application dose, greatly reduced NO emissions through improved soil pH. The results suggest that increasing pH of acidic soils is a good applicable approach for reducing NO emissions from urine-treated soils.
一氧化二氮（NO）是一种破坏性很强的温室气体，主要从土壤释放到大气中。牧场土壤，尤其是酸性土壤，通过尿液中氮的沉积，是大气中 NO 的主要贡献者。因此，制定减少酸性土壤中 NO 排放的策略是当务之急。因此，本研究旨在探讨应用白云石减少尿液处理酸性土壤中 NO 排放的可能性。将尿液施用于土壤会增加 NH-N、NO-N、微生物生物量 C（MBC）和溶解有机 C（DOC）的产生，与仅施土壤的对照相比，会导致更高的 NO 排放。仅用尿液处理的土壤中，NO 排放速率最高（1.35μg NO-N kg h）和累积通量（408μg NO-N kg）。白云石的添加，特别是较高的施用量，通过提高土壤 pH 值，大大减少了 NO 的排放。结果表明，提高酸性土壤的 pH 值是减少尿液处理土壤中 NO 排放的一种可行方法。
