为研究加气条件下土壤过氧化氢酶活性（CAT）和番茄生长对土壤CO2排放的影响，试验于2017年4月至7月采用静态暗箱/气相色谱法对加气灌溉（AI）和常规膜下滴灌（CK）两个处理下的温室番茄地土壤CO2排放进行原位监测；并同时测定各处理CAT、土壤充水孔隙率（WFPS）、土壤温度和番茄株高。结果表明：在番茄整个生育期内，各处理土壤CO2排放通量均呈现先增加后减小的趋势；CAT呈现波动性变化，在生育末期达到最大值。AI处理CO2累积排放量（9031.08 kg/hm2）较CK处理增加了2.4%，但不显著（P>0.05）。此外，加气灌溉促进了番茄的生长，增加了CAT和土壤温度，但降低了WFPS，且处理间各指标差异性均不明显（P>0.05）。土壤CO2排放通量与CAT、土壤温度和番茄株高均呈正相关（P>0.05），与WFPS呈极显著负相关（P<0.01）。
Abstract
In order to study the effects of soil catalase activity (CAT) and tomato growth on soil CO2 emission under the condition of aerated irrigation, an experiment was conducted by using the static closed chamber/gas chromatography method from April to July, 2017. The experiment adopted two treatments: aerated irrigation (AI) and traditional subsurface drip irrigation (CK). Soil CO2 flux, CAT, soil water-filled pore space (WFPS), soil temperature and plant height of tomato were measured simultaneously. The results indicated that throughout the whole growth stage of tomato, soil CO2 fluxes showed a first increasing then decreasing under the two treatments, and soil catalase activity presented a fluctuating change and reached the maximum value at the end of tomato growing period. Compared to CK, AI increased cumulative soil CO2 emissions by 2.4%, but the treatment effect was not significant (P>0.05). AI promoted tomato growth, increased CAT and soil temperature, while decreased WFPS, but the differences between the two treatments did not reach a significant level (P>0.05). Positive correlations between soil CO2 fluxes with CAT, soil temperature and plant height were observed (P>0.05). Significant negative relationships among soil CO2 fluxes and WFPS were reported (P<0.01)
关键词
加气灌溉 /
土壤 CO2 /
过氧化氢酶活性 /
番茄
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Key words
aerated irrigation /
soil CO2 /
soil catalase activity /
tomato
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基金
国家重点研发计划项目( 2016YFC0400200) ; 国家自然科学基金项目( 51309192) 。
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