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中文摘要：
采用田间原位采集系统,于2010年7月25日～2010年9月11日对小白菜生长期间土壤剖面7cm,15cm,30cm与50cm N2O浓度进行田间原位监测。结果表明,土壤剖面间N2O浓度呈现较大的时空变异性。同一土层中,N2O浓度的变异性达到31%～135%。7cm与15cm,30cm与50cm土壤剖面间土层间N2O浓度呈显著的正相关。30cm与50cm土层的N2O浓度显著大于7cm与15cm土层的N2O浓度。小白菜地的30～50cm土层是N2O产生的主要位点。此外蔬菜地土壤剖面有明显的硝酸盐积累现象,同时表层土壤pH低于底层土壤。
英文摘要：
Using in situ multilevel soil gas sampling probes, nitrous oxide （N2 O） concentrations at 7,15,30 and 50 cm soil profile were monitored during the baby bok choy（Brassica rapa Chinensis L. ） growing from 25 July to 1l Septem- ber in 2010. The results showed that N20 concentration of soil profile had highly Tempospatial variations. At the same soil profile, N20 concentration variation amounted to 31% - 135 %. N2 O concentrations between 7 and 15 corn showed significant positive correlation, as well as between 30 and 50 cm. N20 concentrations from 30 and 50 cm soil profile were significantly higher than those from 7 and 15 cm soil profile. Main production site of N20 was from 30 to 50 cm soil profile. In addition, there was obvious nitrate accumulation. And pH from surface layer was lower than that from bottom layer in vegetable soil profile.
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