机械化秸秆还田对稻田土壤碳氮动态的影响
毕业论文关键词：秸秆还田、稻田、碳氮动态
Effects of mechanized straw returning on soil carbon and nitrogen dynamics in paddy soil
Abstract:Straw return to field as an effective straw treatment not only can improve soil fertility, increase crop yield, but also can alleviate farmland ecological pressure. The effect of mechanized straw returning on soil active organic carbon pool, nitrate nitrogen, ammonium nitrogen and total nitrogen could be used to provide a theoretical basis for the proposed method of straw production. Respectively, in Rugao, Jintan, Siyang three arrangements to spin tillage, rotary tillage is not field, plow farming and plowing do not return to field processing, before farming, seedling, tillering, jointing and booting Soil samples were obtained and four indexes were measured and soil carbon and nitrogen dynamics were analyzed. The results of this experiment show that under the short-term conditions, whether the mechanized straw returning method and the straw returning field did not affect the soil organic carbon content in most experiments, nor could it significantly affect the contents of ammonium nitrogen, nitrate nitrogen and total nitrogen Content, but a few experiments in the field of straw and straw does not return between the significant difference, but did not show the specific impact of the law.
Key words:straw return、rice field、carbon and nitrogen dynamic
目录
摘要 3
关键词 3
Abstract 3
Key words 3
引言（或绪论） 3
1.材料与方法 4
1.1实验设计 4
1.2实验方法 4
1.2.1总有机碳含量的测定4
1.2.2铵态氮含量的测定4
1.2.3硝态氮含量的测定 4
1.2.4全氮含量的测定 4
1.3数据分析 4
2.结果与分析 4
2.1不同处理对土壤有机碳含量的影响5
2.2不同处理对土壤铵态氮含量的影响9
2.3不同处理对土壤硝态氮含量的影响11
2.4不同处理对土壤全氮含量的影响12
3.讨论12
致谢13
参考文献13
机械化秸秆还田对稻田土壤碳氮动态的影响
引言：我国作物秸秆资源非常丰富，2005 年全国作物秸秆总产量就已经达到8.42万吨，而且每年都在递增，如何合理有效地处理秸秆已成为当前急需解决的问题。秸秆焚烧不仅污染环境，还会引起土壤微生物数量大量减少，减缓肥料转化速度，降低肥效。秸秆还田作为一种有效的秸秆处理方式，不仅可以增加作物产量，减少温室气体排放，而且可以改善土壤肥力。通过本实验，可以获取稻麦秸秆机械化连续还田对于土壤碳氮动态影响的数据，从而为提高秸秆利用率、发展低碳农业，缓解秸秆处理方式不当导致的气候变暖等全球性生态环境问题提供理论支持，同时也为今后更好的开展秸秆机械化还田技术推广和制定相关政策法规提供技术支撑。麦稻两熟是长江流域粮食主产区主要的耕作制度，江苏省作为种粮大省，稻田耕作面积约有2400万亩，对保障国家粮食安全发挥着十分重要的作用。同时,秸秆还田作为一种农业可持续技术也重新得到重视。随着时代的发展,秸秆的地位发生了很大的改变。但是，秸秆的焚烧给环境带来了巨大的污染。