Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Controls on the Dynamics of Dissolved Organic Carbon and Nitrogen in a Central European Deciduous Forest

Stephan Solinger, Karsten Kalbitz and Egbert Matzner
Biogeochemistry
Vol. 55, No. 3 (Sep., 2001), pp. 327-349
Published by: Springer
Stable URL: http://www.jstor.org/stable/1469963
Page Count: 23
  • Download ($43.95)
  • Cite this Item
Controls on the Dynamics of Dissolved Organic Carbon and Nitrogen in a Central European Deciduous Forest
Preview not available

Abstract

Despite growing attention concerning the role of dissolved organic matter (DOM) in element cycling of forest ecosystems, the controls of concentrations and fluxes of both dissolved organic carbon (DOC) and nitrogen (DON) under field conditions in forest soils remain only poorly understood. The goal of this project is to measure the concentrations and fluxes of DON, NH4+, NO3- and DOC in bulk precipitation, throughfall, forest floor leachates and soil solutions of a deciduous stand in the Steigerwald region (northern Bavaria, Germany). The DOC and DON concentrations and fluxes were highest in leachates originating from the Oa layer of the forest floor (73 mg C L-1, 2.3 mg N L-1 and about 200-350 kg C, 8-10 kg N ha-1 yr-1). They were observed to be highly variable over time and decreased in the mineral topsoil (17 mg C L-1, 0.6 mg N L-1 and about 50-90 kg C, 2.0 to 2.4 kg N ha-1 yr-1). The annual variability of DOC and DON concentrations and subsequential DOC/DON ratios was substantial in all solutions. The DOC and DON concentrations in throughfall were positively correlated with temperature. The DOC and DON concentrations did not show seasonality in the forest floor and mineral soil. Concentrations were not related to litterfall dynamics but did correspond in part to the input of DOC and DON from throughfall. The throughfall contribution to the overall element fluxes was higher for DON than for DOC. Concentrations and fluxes of DON were significantly correlated to DOC in throughfall and the Oi layer. However, the correlation was weak in Oa leachates. In addition, seasonal and annual variation of DOC/DON ratios indicated different mechanisms and release rates from the forest floor for both components. The concentrations of DOC and DON in forest floor leachates were in most cases dependent neither on the pH value or ionic strength of the solution, nor on the water flux or temperature changes. As a consequence, the DOC and DON fluxes from the forest floor into the mineral soil were largely dependent on the water flux if annual and biweekly time scales are considered.

Page Thumbnails

  • Thumbnail: Page 
[327]
    [327]
  • Thumbnail: Page 
328
    328
  • Thumbnail: Page 
329
    329
  • Thumbnail: Page 
330
    330
  • Thumbnail: Page 
331
    331
  • Thumbnail: Page 
332
    332
  • Thumbnail: Page 
333
    333
  • Thumbnail: Page 
334
    334
  • Thumbnail: Page 
335
    335
  • Thumbnail: Page 
336
    336
  • Thumbnail: Page 
337
    337
  • Thumbnail: Page 
338
    338
  • Thumbnail: Page 
339
    339
  • Thumbnail: Page 
340
    340
  • Thumbnail: Page 
341
    341
  • Thumbnail: Page 
342
    342
  • Thumbnail: Page 
343
    343
  • Thumbnail: Page 
344
    344
  • Thumbnail: Page 
345
    345
  • Thumbnail: Page 
346
    346
  • Thumbnail: Page 
347
    347
  • Thumbnail: Page 
348
    348
  • Thumbnail: Page 
349
    349