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- Title
Soil N chemistry in oak forests along a nitrogen deposition gradient.
- Authors
Nilsson, Lars Ola; Wallander, Håkan; Bååth, Erland; Falkengren-Grerup, Ursula
- Abstract
Anthropogenic N deposition may change soil conditions in forest ecosystems as demonstrated in many studies of coniferous forests, whereas results from deciduous forests are relatively scarce. Therefore the influence of N deposition on several variables was studied in situ in 45 oak-dominated deciduous forests along a N deposition gradient in southern Sweden, where the deposition ranged from 10 to 20 kg N ha−1 year−1. Locally estimated NO deposition, as measured with ion-exchange resins (IER) on the soil surface, and grass N concentration (%) were positively correlated with earlier modelled regional N deposition. Furthermore, the δ15N values of grass and uppermost soil layers were negatively correlated with earlier modelled N deposition. The data on soil NO, measured with IER in the soil, and grass N concentration suggest increased soil N availability as a result of N deposition. The δ15N values of grass and uppermost soil layers indicate increased nitrification rates in high N deposition sites, but no large downward movements of NO in these soils. Only a few sites had NO concentrations exceeding 1 mg N l−1 in soil solution at 50 cm depth, which showed that N deposition to these acid oak-dominated forests has not yet resulted in extensive leaching of N. The δ15N enrichment factor was the variable best correlated with NO concentrations at 50 cm and is thus a variable that potentially may be used to predict leaching of NO from forest soils.
- Subjects
FORESTS &; forestry; OAK; NITRATES; NITROGEN compounds; LEACHING; CHEMICAL engineering; IN situ processing (Mining); AGRICULTURE; NATURAL resources
- Publication
Biogeochemistry, 2006, Vol 80, Issue 1, p43
- ISSN
0168-2563
- Publication type
Article
- DOI
10.1007/s10533-005-6220-x