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Simulation of N2O emissions and nitrate leaching from plastic mulch radish cultivation with LandscapeDNDC

Title data

Kim, Youngsun ; Berger, Sina ; Kettering, Janine ; Tenhunen, John ; Haas, Edwin ; Kiese, Ralf:
Simulation of N2O emissions and nitrate leaching from plastic mulch radish cultivation with LandscapeDNDC.
In: Ecological Research. Vol. 29 (2014) Issue 3 . - pp. 441-454.
ISSN 1440-1703

Abstract in another language

Radish is one of the major dry field crops in Asia commonly grown with plastic mulch and high ratesof N fertilization, and potentially harming the environment due to N2O emissions and nitrate leaching. Despitethe widespread use of plastic mulch, biogeochemical models so far do not yet consider impacts of mulch on soil environmental conditions and biogeochemistry. Inthis study, we adapted and successfully tested the LandscapeDNDC model against field data by simulating crop growth, C and N turnover and associated N2Oemissions as well as nitrate leaching for radish cultivation with plastic mulch and in conjunction with differentrates of N fertilization (465–765 kg N ha-1 year-1). Due to the sandy soil texture and monsoon climate, nitrate leaching with rates up to 350 kg N ha-1 year-1 was the dominant reason for overall low nitrogen use efficiency (32–43 %). Direct or indirect N2O emissions (calculated from simulated nitrate leaching rates and IPCC EF ind = 0.0075) ranged between 2 and 3 kg N ha-1 year-1, thus contributing an equal amount to total field emissions of about 5 kg N ha-1 year-1. Based on our results, emission factors for direct N2O emissions ranged between 0.004 and 0.005. These values are onlyhalf of the IPCC default value (0.01), demonstrating the need of biogeochemical models for developing site and/or region specific EFs. Simulation results also revealed that changes in agricultural management by applyingthe fertilizer only to the rows would be an efficient mitigation strategy, effectively decreasing field nitrate leaching and N2O missions by 50–60 %.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER124091
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jul 2015 05:53
Last Modified: 29 Jul 2015 05:53