College of Resources and Environmental Sciences, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China.
Environ Pollut. 2013 May;176:198-207. doi: 10.1016/j.envpol.2013.01.040. Epub 2013 Feb 19.
Here, we report on a two-years field experiment aimed at the quantification of the emissions of nitrous oxide (N2O) and methane (CH4) from the dominant wheat-maize double cropping system in North China Plain. The experiment had 6 different fertilization strategies, including a control treatment, recommended fertilization, with and without straw and manure applications, and nitrification inhibitor and slow release urea. Application of N fertilizer slightly decreased CH4 uptake by soil. Direct N2O emissions derived from recommended urea application was 0.39% of the annual urea-N input. Both straw and manure had relatively low N2O emissions factors. Slow release urea had a relatively high emission factor. Addition of nitrification inhibitor reduced N2O emission by 55%. We conclude that use of nitrification inhibitors is a promising strategy for N2O mitigation for the intensive wheat-maize double cropping systems.
本研究在华北平原典型农田开展了为期两年的田间试验，旨在量化冬小麦-夏玉米轮作体系中氧化亚氮（N2O）和甲烷（CH4）的排放。该试验设置了 6 种不同的施肥策略，包括对照、推荐施肥、秸秆还田、有机肥、硝化抑制剂和控释尿素。施氮略微降低了土壤对 CH4 的吸收。推荐施尿素直接导致的 N2O 排放量占年尿素-N 投入的 0.39%。秸秆和有机肥的 N2O 排放因子相对较低。控释尿素的排放因子相对较高。添加硝化抑制剂可减少 55%的 N2O 排放。因此，我们认为硝化抑制剂的使用是减少集约化冬小麦-夏玉米轮作体系 N2O 排放的一种有前途的策略。
