小白菜地土壤剖面N_2O分布特征与土壤性质变化  

Distribution Characteristics of Nitrous Oxide Concentrations of Soil Profile and Soil Properties from Baby Bok Choy Field

作　　者：贾俊香[1,2] 熊正琴[1] 孙丽英[1] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095 [2]山西农业大学资源与环境学院,山西太谷030801

出　　处：《山西农业大学学报（自然科学版）》2012年第1期48-52,共5页Journal of Shanxi Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金项目(40971139;41171238);教育部新世纪人才支持计划(NCET-10-0475);公益性行业农业科研专项(200903003);中央高校基本科研业务费专项(KYZ201110)

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。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.

关 键 词：氧化亚氮 土壤剖面 小白菜地 分布特征 

分 类 号：P461.4[天文地球—大气科学及气象学] S152.6[农业科学—土壤学]