秸秆还田配施复合肥对茉莉园温室气体排放的影响

Effect of straw returning combined with compound fertilizer on greenhouse gas emission from Jasmine Garden

为了阐明秸秆还田配施复合肥对温室气体排放的影响,采用静态箱—气相色谱法,对福州茉莉园秸秆与复合肥配施处理下温室气体排放及其影响因子进行了测定与分析。结果表明:秸秆还田条件下,对照(CK)、减半、正常、倍增施肥量处理CO2排放通量均值分别为(331.58±15.65)、(375.22±71.98)、(397.53±59.42)、(642.01±72.79) mg·m-2·h-1,CO2排放通量与土壤温度极显著正相关(P<0.01),与pH、总铁、Fe3+极显著负相关(P<0.01); CK、减半、正常、倍增施肥量处理CH4排放通量均值分别为(56.18±17.09)、(33.58±14.42)、(67.86±16.26)、(14.16±4.21)μg·m-2·h-1,CK处理CH4排放通量与土壤温度呈极显著负相关(P<0.01); CK、减半、正常、倍增施肥量处理N2O排放通量均值分别为(28.95±4.10)、(4.71±1.28)、(29.50±1.30)、(6.12±1.27)μg·m-2·h-1,N2O排放通量与土壤温度呈极显著正相关(P<0.01),与pH、总铁呈极显著负相关(P<0.01)。与CK相比,减半处理降低了CH4和N2O排放通量。CK处理的综合温室效应低于其他配施复合肥处理。

In order to clarify the ettects of mixed application of straw returning and compound tertilizer on greenhouse gas emissions, the greenhouse gas emission and its influencing thctors under straw returning combined with ditterent dose compound fertilizers were measured by static chamber-gas chromatography analysis in Fuzhou Jasmine Garden. The results showed that the mean CO： emission fluxes of the control （ only straw）, halving （ straw＋half amount of compound tertilizer）, normal （ straw＋standard amount of compound teailizer） and double （ straw ＋ double amount of compound tertilizer） groups were （ 331.58 ± 15.65 ）, （ 375.22 ± 71.98 ）, （397.53±59.42）, and （642.01±72.79） mg· m^-2·h^-1, respectively. The CO2 emission flux was significantly positively con＇elated with soil temperature （P〈0.01）, but significantly negatively cmTelated with pH, total iron, and Fe^3＋（P〈0.01）. The mean CH4 emission fluxes of the control, halving, normal, and double groups were （56.18± 17.09）, （ 33.58± 14.42）, （67.86± 16.26）, and （14.16±4.21） μg · m^-2 · h^-1 respectively. The CH4 emission flux of the control treatment was significantly negatively ton＇elated with soil temperature （P〈0.01）. The mean N20 emission fluxes of the control, halving, nonnal, and doubled groups were （28.95±4.10）, （4.71±1.28）, （29.50±1.30）, and （6.12±1.27） μg · m^-1· h^-1, respectively. The N：O flux was significantly positively ton＇elated with soil temperature （P〈0.01）, but was significantly negatively ton＇elated with soil pH and total iron （P〈0.01）. Com- pared to the control treatment, the halving mixed treatment reduced the CH4 and N： 0 gas emission fluxes. The comprehensive green- house gas emission effect of the single straw returning （control） application was lower than that of other doses of compound terfilizer.