Effects of agricultural land use on dissolved organic carbon and nitrogen in surface runoff and subsurface drainage

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Manninen , N J , Soinne , H S , Lemola , R , Hoikkala , L K & Turtola , E 2018 , ' Effects of agricultural land use on dissolved organic carbon and nitrogen in surface runoff and subsurface drainage ' , The Science of the Total Environment , vol. 618 , pp. 1519-1528 . https://doi.org/10.1016/j.scitotenv.2017.09.319

Title: Effects of agricultural land use on dissolved organic carbon and nitrogen in surface runoff and subsurface drainage
Author: Manninen, Noora Johanna; Soinne, Helena Susanna; Lemola, Riitta; Hoikkala, Laura Kristiina; Turtola, Eila
Contributor organization: Department of Agricultural Sciences
Doctoral Programme in Interdisciplinary Environmental Sciences
Environmental Soil Science
Faculty of Agriculture and Forestry
Helsinki Institute of Sustainability Science (HELSUS)
Environmental Sciences
Date: 2018-03-15
Language: eng
Number of pages: 10
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2017.09.319
URI: http://hdl.handle.net/10138/237874
Abstract: Dissolved organic carbon (DOC) load in discharges from cultivated soils may have negative impacts on surface waters. The magnitude of the load may vary according to soil properties or agricultural management practices. This study quantifies the DOC load of cultivated mineral soils and investigates whether the load is affected by agricultural practices. Discharge volumes and concentrations of DOC and dissolved organic nitrogen (DON) were continually measured at three sites from surface runoff and artificial subsurface drainage or from combined total discharge over a two-year period (2012-2014). Two experimental sites in South-West Finland had clayey soils (with soil carbon contents of 2.7-5.9% in the topmost soil layer), and the third site in West-Central Finland had sandy soil (soil carbon contents of 4.3-6.2%). Permanent grassland, organic manure application, mineral fertilization, and conventional ploughing or no-till activities were studied. Furthermore, the biodegradable DOC pool of surface runoff and subsurface drainage water from no-till and ploughed fields was estimated in a 2-month incubation experiment with natural bacterial communities collected from the Baltic Sea seawater. The annual DOC and DON loads were affected by discharge volume and seasonal weather conditions. The loads varied between 25-52 kg ha(-1) and 0.8-3.2 kg ha(-1), respectively, and were comparable to those from boreal forests with similar soil types. The DOC load increased with increasing topsoil carbon content at all sites. There were slightly higher DOC concentrations and DOC load from permanent grassland, but otherwise we could not distinguish any clear management-induced differences in the total DOC loads. While only 6-17% of the DOC in discharge water was biologically degraded during the 2-month incubation, the proportion of biodegradable (labile) DOC in surface runoff appeared to increase when soil was ploughed compared to no-till. (c) 2017 Elsevier B.V. All rights reserved.
Subject: 1172 Environmental sciences
415 Other agricultural sciences
Agricultural management
Discharge route
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion

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