%0 Journal Article
%T Effect of nitrification inhibitor DMPP on nitrogen leaching, nitrifying organisms, and enzyme activities in a rice-oilseed rape cropping system
%A LI Hua
%A LIANG Xinqiang
%A CHEN Yingxu
%A LIAN Yanfeng
%A TIAN Guangming
%A NI Wuzhong
%A <br>LI Hu
%A LIANG Xinqiang
%A CHEN Yingxu
%A LIAN Yanfeng
%A TIAN Guangming
%A NI Wuzhong
%J 环境科学学报(英文版)
%D 2008
%I 
%X DMPP (3,4-dimethylpyrazole phosphate) has been used to reduce nitrogen (N) loss from leaching or denitrification and to improve N supply in agricultural land. However, its impact on soil nitrifying organisms and enzyme activities involved in N cycling is largely unknown. Therefore, an on-farm experiment, for two years, has been conducted, to elucidate the effects of DMPP on mineral N (NH4 -N and NO3--N) leaching, nitrifying organisms, and denitrifying enzymes in a rice-oilseed rape cropping system. Three treatments including urea alone (UA), urea 1% DMPP (DP), and no fertilizer (CK), have been carried out. The results showed that DP enhanced the mean NH4 -N concentrations by 19.1%-24.3%, but reduced the mean NO3--N concentrations by 44.9%-56.6% in the leachate,under a two-year rice-rape rotation, compared to the UA treatment. The population of ammonia oxidizing bacteria, the activity of nitrate reductase, and nitrite reductase in the DP treatment decreased about 24.5%-30.9%, 14.9%-43.5%, and 14.7%-31.6%, respectively, as compared to the UA treatment. However, nitrite oxidizing bacteria and hydroxylamine reductase remained almost unaffected by DMPP.It is proposed that DMPP has the potential to either reduce NO3--N leaching by inhibiting ammonia oxidization or N losses from denitrification, which is in favor of the N conversations in the rice-oilseed rape cropping system.
%K DMPP (3
%K 4-dimethylpyrazole phosphate)
%K nitrification inhibitor
%K nitrifying organisms
%K nitrogen leaching
%K soil enzymes<br>3
%K 4-二甲基吡唑磷酸盐
%K 硝化抑制剂
%K 硝化细菌
%K 土壤酶
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=D0DC96980E42BC97E30D561F52C75DDB&yid=67289AFF6305E306&vid=A04140E723CB732E&iid=0B39A22176CE99FB&sid=EB552E4CFC85690B&eid=7CE3F1F20DE6B307&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=1&reference_num=33