Nitrapyrin effectiveness in reducing nitrous oxide emissions decreases at low doses of urea in an Andosol  

作　　者：Mayela MONGE-MUÑOZ Segundo URQUIAGA Christoph MÜLLER Juan Carlos CAMBRONEROHEINRICHS Mohammad ZAMAN Cristina CHINCHILLA-SOTO Azam BORZOUEI Khadim DAWAR Carlos E.RODRÍGUEZ-RODRÍGUEZ Ana Gabriela PÉREZ-CASTILLO 

机构地区：[1]Environmental Pollution Research Center(CICA),University of Costa Rica,Montes de Oca 11501(Costa Rica) [2]Embrapa Agrobiology,Rod.BR 465,km 7,Seropédica,RJ,CEP 23891-000(Brazil) [3]Institute of Plant Ecology,Justus Liebig University Giessen,Heinrich-Buff Ring 26,Giessen 35392(Germany) [4]School of Biology and Environmental Science,University College Dublin,Belfield,Dublin 4(Ireland) [5]Soil and Water Management&Crop Nutrition Section,Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture,Department of Nuclear Sciences and Applications,International Atomic Energy Agency,Vienna International Centre,Vienna 1400(Austria) [6]Nuclear Agriculture Research School,Nuclear Science and Technology Research Institute(NSTRI),Karaj 3148644111(Iran) [7]Department of Soil and Environmental Sciences,University of Agriculture,Peshawar 25000(Pakistan)

出　　处：《Pedosphere》2021年第2期303-313,共11页土壤圈（英文版）

基　　金：supported by the International Atomic Energy Agency (IAEA), Vienna, Austria through a Coordinated Research Project (No. CRP D1.50.16) of Soil and Water Management and Crop Nutrition Section, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture;by the University of Costa Rica (No. VI-802-B7-505)

摘　　要：In the tropics,frequent nitrogen(N)fertilization of grazing areas can potentially increase nitrous oxide(N_(2)O)emissions.The application of nitrification inhibitors has been reported as an effective management practice for potentially reducing N loss from the soil-plant system and improving N use efficiency(NUE).The aim of this study was to determine the effect of the co-application of nitrapyrin(a nitrification inhibitor,NI)and urea in a tropical Andosol on the behavior of N and the emissions of N_(2)O from autotrophic and heterotrophic nitrification.A greenhouse experiment was performed using a soil(pH 5.9,organic matter content 78 g kg^(-1),and N 5.6 g kg^(-1))sown with Cynodon nlemfuensis at 60%water-filled pore space to quantify total N_(2)O emissions,N_(2)O derived from fertilizer,soil ammonium(NH_(4)^(+))and nitrate(NO_(3)^(-)),and NUE.The study included treatments that received deionized water only(control,NI).No significant differences were observed in soil NH_(4)^(+)content between the UR and UR+NI treatments,probably because of soil mineralization and NO_(3)^(-)produced by heterotrophic nitrification,which is not effectively inhibited by nitrapyrin.After 56 d,N_(2)O emissions in UR(0.51±0.12 mg N_(2)O-N concluded that the soil organic N mineralization and heterotrophic nitrification are the main processes of NH_(4)^(+)and NO_(3)^(-)production.Additionally,it was found that N_(2)O emissions were partially a consequence of the direct oxidation of the soil's organic N via heterotrophic nitrification coupled to denitrification.Finally,the results suggest that nitrapyrin would likely exert significant mitigation on N_(2)O emissions only if a substantial N surplus exists in soils with high organic matter content.

关 键 词：autotrophic nitrification heterotrophic nitrification mineral N ^(15)N tracer nitrification inhibitor tropical grass 

分 类 号：S154.1[农业科学—土壤学]