氰氨化钙与生物炭配施对设施菜地土壤N_(2)O、NH_(3)排放的影响

Effects of combined application of calcium cyanamide and biochar on N_(2)O and NH3 emissions from greenhouse vegetable soil

为了探索施用氰氨化钙(石灰氮)设施菜地土壤N_(2)O和NH_(3)的协同减排技术,本研究通过室内模拟试验,采用静态箱法和动态箱法测定了氰氨化钙(LN)、氰氨化钙+酸性生物炭(LN+MB)、氰氨化钙+中性生物炭(LN+WB)、氰氨化钙+碱性生物炭(LN+AB)4个处理N_(2)O和NH_(3)的排放量与排放特征。结果表明:与单施氰氨化钙相比,配施酸性和碱性生物炭使土壤N_(2)O累积排放量分别降低了66.70%和55.45%。配施3种生物炭均使土壤NH_(3)累积挥发量降低,降幅为7.26%~59.61%,另外提高土壤NO3--N含量8.05%~23.57%,降低土壤NH_(4)^(+)-N含量19.00%~43.12%。配施酸性生物炭对土壤N_(2)O、NH_(3)联合减排效果最佳,土壤N_(2)O、NH_(3)和GHG比单施氰氨化钙分别降低了66.70%、59.61%和64.55%。

In order to investigate the synergistic reduction ofN2O and NH_(3)from vegetable soils applied with calcium cyanamide,this study analyzed the impacts of applying calcium cyanamide(LN)and with acidic(LN+MB),neutral(LN+WB)or alkaline(LN+AB)biochar on N2O and NH_(3)emissions from vegetable soil in lab using static and dynamic chamber method.The results showed that the combined application of calcium cyanamide with acidic and alkaline biochar reduced the cumulative emission of N2O by 66.70%and 55.45%respectively compared with that of LN.Combined application of three kinds of biochar reduced the cumulative volatilization of soil NH_(3)by 7.26%-59.61%,increased the content of soil NO3-N by&05%-23.57%,and reduced the content of soil NH_(4)^(+)-N by 19.00%-43.12%.Among the three biochar,acid biochar had the best effect on the combined emission reduction of soil N2O and NH_(3).The soil N2O,NH_(3)and GHG were reduced by 66.70%,59.61%and 64.55%respectively compared with that of LN.