黑麦秸秆对土壤中无机氮转化和N_2O、CO_2释放的影响

在欧美国家,黑麦秸秆经常作为有机肥或农业废弃物而归还到农田中。本研究通过培养试验探讨了添加黑麦秸秆对土壤中无机氮的形态转化和N_2O、CO_2释放的影响。研究结果表明,黑麦秸秆的添加量及培养时间对土壤中N_2O、和CO_2释放量、N_2O/CO_2比值和无机氮形态转化均有明显影响。添加的黑麦秸秆越多,培养2周后土壤中的NH_4-N越多,释放的N_2O则越少。N_2O/CO_2比值与黑麦秸秆添加量呈极显著的负相关,与培养时间(T)的函数关系(达到极显著的负相关)则呈对数形式:(N_2O/CO_2)=a b·lnT。

Effects of Rye Straw on Nitrogen Transformation in Soil, N_2O and CO_2 Evalutions, and Soil pH

Rye straw is usually applied as manure to agricultural field or disposed to soils in European countries. The research was carried out to understand effect of application of rye straw on transformation of inorganic nitrogen in soil, and on N2O and CO2 emissions. The results indicated that N2O and CO2 emissions, N2O/CO2 ratio, and inorganic nitrogen transformation were related to the applied amount of rye straw and the incubation time. At the end of 2-week's incubation, NH4-N in the soil increased and N2O emission decreased when more amount of rye straw was added. There was a positively significant relationship between N2O/CO2 ratio and the amount of the straw. The relationships between N2O/CO2 ratios (Y) and incubation time (T) could been described as following equation: Y = a blnT .