Successional and physical controls on the retention of nitrogen in an undisturbed boreal forest ecosystem

Oecologia
Richard E BrennerRoger W Ruess

Abstract

Floristic succession in the boreal forest can have a dramatic influence on ecosystem nutrient cycling. We predicted that a decrease in plant and microbial demand for nitrogen (N) during the transition from mid- to late-succession forests would induce an increase in the leaching of dissolved inorganic nitrogen (DIN), relative to dissolved organic nitrogen (DON). To test this, we examined the chemistry of the soil solution collected from within and below the main rooting zones of mid- and late-succession forests, located along the Tanana River in interior Alaska. We also used a combination of hydrological and chemical analyses to investigate a key assumption of our methodology: that patterns of soil water movement did not change during this transition. Between stands, there was no difference in the proportion of DIN below the rooting zone. 84-98% of DIN at both depths consisted of nitrate, which was significantly higher in the deeper mineral soil than at the soil surface (0.46+/-0.12 mg NO(-) (3) -N l(-1) vs 0.17+/-0.12 mg NO(-) (3) -N l(-1), respectively), and 79-92% of the total dissolved N consisted of DON. Contrary to our original assumption that nutrients were primarily leached downward, out of the rooting zone, we found muc...Continue Reading

References

Jul 20, 2002·Science·Anthony A ArendtVirginia B Valentine
Sep 3, 2002·Computer Methods and Programs in Biomedicine·Rodolphe ThiébautDaniel Commenges
Jun 1, 1996·Trends in Ecology & Evolution·J B Jones, R M Holmes

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