1.College of Resource and Environment, Anhui Science and Technology University,Fengyang;2.College of Resource and Environment, Anhui Science and Technology University
Supported by the National Key R&D Program of China (No. 2017YFD0301302) and the Innovative Training Program for College Students of Anhui Science and Technology University of China (No. X202010879009)
水肥管理对农田土壤肥力质量和环境质量有重要影响。依托安徽科技学院长期定位试验小区，通过设置两种灌溉模式（控制灌溉C1和常规灌溉C2）以及三个施氮水平(低氮N1、中氮N2和高氮N3)，研究水氮互作对稻田温室气体CH4、N2O和CO2排放及土壤理化性质的影响。结果表明，与常规灌溉相比，控制灌溉可显著降低稻田中的CH4和N2O的累计排放量，降幅分别为43.12%和23.53%；常规灌溉条件下，低、中、高施氮处理的土壤铵态氮含量分别为35.26、38.90和35.20 mg?kg-1，而控制灌溉分别为33.08、34.30和42.40 mg?kg-1；控制灌溉条件下，CO2排放量高于常规灌溉，且随施氮水平的提高而增加。根据总体温室效应分析，控制灌溉下稻田的全球增温潜势（global warming potential，GWP）为0.55 t?hm-2（以CO2当量计），远低于常规灌溉下稻田0.82 t?hm-2，且中氮处理下稻田的GWP远低于低氮和高氮处理。水氮耦合是稻田N2O排放的主要影响因素，且在中、高氮施肥条件下，稻田N2O排放对于温室效应的贡献大于CH4。因此，采用控制灌溉结合氮肥减量施用，可有效减少农田温室气体CH4和N2O的排放，维持较高的土壤铵态氮水平，这对提高土壤肥力质量和发展可持续农业具有重要意义。
【Objective】In order to study the effects of water management-nitrogen fertilizer on greenhouse gas (CH4, N2O and CO2) emission and soil physicochemical properties.【Method】Two irrigation modes including controlled irrigation (C1) and normal irrigation (C2), and three nitrogen application levels (low nitrogen, N1; medium nitrogen, N2 and high nitrogen, N3) were set up under a long-term pilot plot. 【Result】 The results showed that compared with normal irrigation, controlled irrigation significantly reduced the cumulative emissions of CH4 and N2O by 43.12% and 23.53%, respectively. Under normal irrigation, the contents of soil ammonium nitrogen in low nitrogen, medium nitrogen and high nitrogen treatments were 35.26, 38.90 and 35.20 mg?kg-1, respectively, while those under controlled irrigation were 33.08, 34.30 and 42.40 mg?kg-1, respectively. Under the condition of controlled irrigation, CO2 emission was higher than that of conventional irrigation and increased with the increase of nitrogen application level. According to the overall analysis of the Greenhouse Effect, the GWP (global warming potential) of 0.55 t?hm-2 under controlled irrigation was much lower than that of 0.82 t?hm-2, under conventional irrigation, while the GWP of 0.65 t?hm-2 under N2 treatment was much lower than that of 0.74 t?hm-2 under N1 treatment and 0.67 t?hm-2 under N3 treatment. The coupling of water and nitrogen was the main factor affecting N2O emission from the paddy field, and under medium and high concentration of nitrogen application, the contribution of N2O emission from the paddy field to the Greenhouse Effect was greater than that of CH4. 【Conclusion】Therefore, the application of controlled irrigation combined with reduced nitrogen fertilizer can effectively decrease the emissions of greenhouse gases, maintain a high level of soil ammonium nitrogen in paddy soil, which is of great significance for improving soil fertility quality and developing sustainable agriculture.
曹开勋,赵 坤,金王飞飞,朱同云,单新亮,梅 航,朱礼洋,钱丽丽,王 峰,肖 新.水氮互作对稻田温室气体排放的影响[J].土壤学报,2022,59(5). DOI:10.11766/trxb202011250646 CAO Kaixun, ZHAO Kun, JIN Wangfeifei, ZHU Tongyun, SHAN Xinliang, MEI Hang, ZHU Liyang, QIAN Lili, WANG Feng, XIAO Xin. Effects of Water-nitrogen Interaction on Greenhouse Gas Emissions in a Paddy Soil[J]. Acta Pedologica Sinica,2022,59(5).复制