title: [Effects of nitrification inhibitors DCD and DMPP on cinnamon soil' s gross nitrogen mineralization and nitrification rates].
abstract: By using 15N pool dilution technique in combining with in situ soil cultivation, this paper studied the effects of nitrification inhibitors dicyandiamide (DCD) and 3,4-dimethylpyrazole phosphate (DMPP) on the gross nitrogen (N) mineralization and nitrification rates in a saline-alkali cinnamon soil in North China. The experiment was carried out in a maize-wheat rotation field in Yuncheng City of Shanxi Province, and three treatments were installed, i.e., urea, urea + DCD, and urea + DMPP. In the first two weeks after fertilization, DCD and DMPP made the gross N mineralization rate and gross N nitrification rate decreased by 25.5% and 7.3%, and by 60.3% and 59.1%, respectively, with a significant difference in the gross N mineralization rate but less difference in the gross N nitrification rate between the effects of DCD and DMPP. However, significant difference was observed in the gross N nitrification rate between the effects of DCD and DMPP after seven weeks of fertilization. The gross N mineralization and nitrification rates and the NH4+ and NO3-consumption rates after two weeks of fertilization were 7.2-10.0, 5.5-21.5, 9.1-12.2, and 5.1-8.4 times of those before fertilization, respectively, possibly due to the stimulating effect of N fertilization. DCD and DMPP made the fertilizer urea N more maintained in NH(4+)-N form and less accumulated in NO(3-)-N form in soil. The decreases of the gross N mineralization and nitrifications rate in the test soil due to the effects of the inhibitors would benefit the reduction of N2O emission from the soil.
authors.affiliation: Key Laboratory of Terrestrial Ecological Processes, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. zhangyan04141233@163.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.forename: Zong-Wei
authors.initials: ZW
authors.lastname: Xia
authors.forename: Yan-Ling
authors.initials: YL
authors.lastname: Guo
mesh_terms: D017753:Ecosystem; D006146:Guanidines / Q000494:pharmacology*; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis*; D011720:Pyrazoles / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D003313:Zea mays / Q000254:growth & development
chemical_list: C433304:3,4-dimethylpyrazole phosphate; D006146:Guanidines; D011720:Pyrazoles; D012987:Soil; C004711:dicyandiamido; D009584:Nitrogen