保护性耕作模式下早稻田甲烷排放特征

发布时间：2018-07-27 16:51

【摘要】：【目的】研究耕作对早稻田甲烷排放的影响,并分析影响稻田甲烷排放的环境因子,寻找合适的耕作模式以减少稻田甲烷排放。【方法】设免耕不施肥、免耕施肥、常规不施肥和常规施肥4个处理,分别在水稻分蘖期和水稻抽穗期采用静态箱法收集气态甲烷(CH_4),同步观测地温、采气箱内温度、环境温度、地表温度、草面温度、相对湿度及风速,探究早稻田CH_4排放的日排放规律,明确免耕和施肥及环境因素对稻田CH_4排放的影响。【结果】早稻田CH_4的排放与气温、地表温度、5 cm土温、草面温度、相对湿度、风速等密切相关,尤其在分蘖期,各处理均与上述环境因子显著相关(P0.05)。不同耕作与施肥模式下,CH_4日平均通量不同,在水稻分蘖期具体表现为常规施肥常规不施肥免耕施肥免耕不施肥,在水稻抽穗期表现为常规不施肥免耕施肥常规施肥免耕不施肥。【结论】免耕与常规耕作相比,早稻田CH_4的排放量相对降低;施肥导致分蘖期早稻田CH_4排放通量增加,但在抽穗期导致早稻田CH_4排放减少。免耕可以减轻早稻田CH_4的排放,其推广能为稻田减排做贡献。
[Abstract]:[Objective] to study the effects of Tillage on methane emission in early rice fields, and to analyze the environmental factors that affect the methane emission of rice fields, and to find a suitable tillage mode to reduce the methane emission in rice fields. [Methods] 4 treatments were set up without tillage, no tillage, no tillage, conventional fertilization and conventional fertilization, respectively, in the tillering period and the heading stage of rice, respectively. The state box method was used to collect gaseous methane (CH_4), observe geotemperature synchronously, temperature in the gas box, environment temperature, surface temperature, grass surface temperature, relative humidity and wind speed, explore the daily emission law of CH_4 emission in early rice field, and clarify the effect of no tillage and fertilization and environmental factors on the CH_4 emission in paddy field. [results] the emission of CH_4 in early paddy field, temperature, surface temperature, 5 cm soil temperature, grass surface temperature, relative humidity, wind speed and other closely related, especially at the tillering stage, each treatment is significantly related to the above environmental factors (P0.05). The average daily flux of CH_4 is different under different tillage and fertilization mode, and in the tillering period of rice, the specific performance is conventional fertilization, regular fertilization, no tillage and no tillage no tillage, no tillage and no fertilization, in Rice Heading Stage Compared with conventional tillage, the emission of CH_4 in early paddy field was relatively lower than conventional tillage. Fertilization resulted in the increase of CH_4 emission in early rice fields at the tillering stage, but the emission of CH_4 in early rice fields was reduced at the heading stage. No tillage could reduce the emission of CH_4 in early rice fields. Contribution to the field emission reduction.
【作者单位】：甘肃农业大学资源与环境学院;广东省农业科学院农业资源与环境研究所;
【基金】：广东省农业面源污染治理项目(2016B070701009) 广东省科技计划项目(2014B090904068,粤科规财字[2014]208号)
【分类号】：S511.31;X712

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