Mitigation of N2O emissions from urine treated acidic soils by liming.
Mitigation of N2O emissions from urine treated acidic soils by liming.
复制标题
DOI：
10.1016/j.envpol.2019.113237
复制
发表时间：
2019-12
影响因子：
8.9
通讯作者：
M. Shaaban;R. Hu;Yu-peng Wu;A. Younas;Xiangyu Xu;Zheng Sun;Yanbin Jiang;Shan Lin
中科院分区：
文献类型：
--
作者：
M. Shaaban;R. Hu;Yu-peng Wu;A. Younas;Xiangyu Xu;Zheng Sun;Yanbin Jiang;Shan Lin
一氧化二氮(N2O)是一种毁灭性的温室气体，主要从土壤释放到大气中。牧场土壤，特别是酸性土壤，通过尿氮的沉积，是大气N2O的主要贡献者。制定减少酸性土壤中N2O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N2O排放的可能效果。土壤施尿增加了土壤中NH_4~+-N、NO_3、−-N、微生物量碳和溶解有机碳的产生量，导致N2O排放量高于对照(只施土壤)。最高的N2O排放速率(1.35 μg N2O-N kg−1h−1)和累积通量(408 μg N2O-N kg−1)出现在只施尿的土壤中。白云石的添加，尤其是较高的施用量，通过改善土壤pH值，大大减少了N2O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N2O排放的一种较好的可行途径。
Nitrous oxide (N2O) is a devastating greenhouse gas mainly released from soils to the atmosphere. Pasture soils, particularly acidic in nature, are large contributors of atmospheric N2O through deposition of urine-N. Devising strategies for reducing N2O 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 N2O emissions from urine treated acidic soil. Application of urine to soil enlarged the production of NH4+-N, NO3−-N, microbial biomass C (MBC) and dissolved organic C (DOC), resulting in higher N2O emissions as compared to the control (soil only). The highest N2O emission rate (1.35 μg N2O-N kg−1h−1) and cumulative flux (408 μg N2O-N kg−1) occurred in urine only treated soil. Dolomite addition, especially higher application dose, greatly reduced N2O emissions through improved soil pH. The results suggest that increasing pH of acidic soils is a good applicable approach for reducing N2O emissions from urine-treated soils.