氢化钙对稻田甲烷和氧化亚氮排放及温室效应的影响

Effects of Calcium Hydride on Methane and Nitrous Oxide Emissions and Greenhouse Effect from Rice Fields

摘要: 为了减少稻田甲烷和氧化亚氮的排放，采用有机肥配施并添加Ca(CN)₂，并通过7组施肥试验测定不同处理早稻产量情况及产量构成因子差异、不同处理早稻分蘖期分蘖数情况、早稻分蘖期不同处理叶绿素SPAD值及早稻CH₄、N₂O季节排放通量情况、早稻各生育期CH₄累积排放量等。通过对比试验证明，肥料添加Ca(CN)₂不仅能够为水稻提供充足的后续氮素营养，还能够减排CH₄气体，添加Ca(CN)₂处理较牛粪处理减排7.54%~34.58%的CH₄，对早期CH₄排放的抑制效果较为明显，对减少稻田温室效应提供一些理论基础。

Abstract: Organic fertilizers were combined with Ca(CN)₂ to reduce the emission of methane and nitrous oxide in paddy fields with 7 sets of fertilization experiments conducted to determine the yield of early rice in different treatments and their differences of yield components, the number of tillers in early rice in different treatments, the chlorophyll SPAD value of different treatments at the tillering stage of early rice, the seasonal emission flux of CH₄ and N₂O of early rice, and the cumulative emission of CH₄ during each growth period of early rice. Comparative experiments have shown that the addition of Ca(CN)₂ in fertilizer can not only provide sufficient nitrogen nutrition for rice, but also reduce CH₄ gas. Adding Ca(CN)₂ treatment reduces CH₄ by 7.54%~34.58% compared with cow manure treatment. In the early stage, the effect of suppressing CH₄ emission was obvious, providing some theoretical bases for reducing the greenhouse effect of rice fields.