The Influence of Organic Carbon on Nitrogen Transformations in Five Wetland Soils

Soil Science Society of America Journal - Tập 64 Số 3 - Trang 1129-1136 - 2000
Torbjörn Davidsson1, Mattias Ståhl1
1Dep. of Limnology Ecology Building, Lund Univ. S‐223 62 Lund Sweden

Tóm tắt

Today we see an increased use of wetlands for N removal in agricultural catchments. Since the most important process for nitrate (NO−3) removal, denitrification, requires organic C, different soils could be expected to be differently suited for wetland construction. In this study, we evaluate the importance of soil organic C and the effects of added dissolved organic C on N transformations in existing and proposed wetlands. We used 15N‐labeled NO−3 to study N transformations in soil columns from five locations (a forest peaty soil, a field peaty soil, a silt loam, a loam, and a sandy loam). All five soils removed NO−3 at substantial rates (13–73% of the load). The field peaty soil had highest denitrification rate (11 mmol m−2 d−1), while sandy loam soil had the lowest rate (2 mmol m−2 d−1). Dissolved organic C did not seem to limit N removal in the soils, as glucose additions affected N turnover only slightly. The forest peat soil differed from the others by exhibiting low nitrification, and relatively high production of nitrite (NO−2), probably a result of low pH. Nitrate removal in the field peat soil and the sandy loam soil was counteracted by production of ammonium (NH+4) and dissolved organic N, causing net N release. Although there was a positive relationship between soil organic matter and NO−3 consumption, we conclude that all soils were suited for N removal. The lack of response to glucose additions indicate that there was no short‐term lack of electron donor in any of the soils, including the sandy loam soil.

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Soil Science Society of America Journal

Tập 64 Số 3

1129-1136

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