Nitrogen mineralization and H+transfers in a Scots pine (Pinus sylvestrisL.) forest soil as affected by liming
✍ Scribed by G. Arnold; M. L. Beusichem; A. Diest
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 779 KB
- Volume
- 161
- Category
- Article
- ISSN
- 0032-079X
No coin nor oath required. For personal study only.
✦ Synopsis
H + production due to N uptake in a mature Scots pine stand subjected to high NH + deposition was previously estimated to amount to approx. 2.2 kmol ha-x y -1. The question whether H + transfers related to N mineralization (ammonification and nitrification) offset or corroborate this proton production is investigated in the present research. To determine N mineralization, soil cores were used of which both ends were closed with layers of ion exchange resin (IER) to prevent influx and efflux of ions. The effect of liming on N mineralization and the resulting H + production was investigated in 7 incubation periods of each ca. 8 wk. Because of its high mobility NO3 accumulated in both IER layers at the expense of that in the incubated forest floor and mineral soil. Net N mineralization in the soil cores as a whole amounted to 40 and 77 kg N ha-l in 384 d in the control and limed plots, respectively. In both treatments ca. 65% of mineralized N was nitrified. H + production due to N mineralization amounted to approx. 1.2 kmol ha-l y -1 in the control and limed plots. Liming reduced the amount of C in the forest floor, but not forest floor mass, because of an increased mixing with mineral particles.