 |
| Titel |
Soil microbial nutrient constraints along a tropical forest elevation gradient: a belowground test of a biogeochemical paradigm |
| VerfasserIn |
A. T. Nottingham, B. L. Turner, J. Whitaker, N. J. Ostle, N. P. McNamara, R. D. Bardgett, N. Salinas, P. Meir |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 20 ; Nr. 12, no. 20 (2015-10-26), S.6071-6083 |
| Datensatznummer |
250118138
|
| Publikation (Nr.) |
 copernicus.org/bg-12-6071-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Aboveground primary productivity is widely considered to be limited by
phosphorus (P) availability in lowland tropical forests and by nitrogen (N)
availability in montane tropical forests. However, the extent to which this
paradigm applies to belowground processes remains unresolved. We measured
indices of soil microbial nutrient status in lowland, sub-montane and montane
tropical forests along a natural gradient spanning 3400 m in elevation in
the Peruvian Andes. With increasing elevation there were marked increases in
soil concentrations of total N, total P, and readily exchangeable P, but a
decrease in N mineralization determined by in situ resin bags. Microbial
carbon (C) and N increased with increasing elevation, but microbial
C : N : P ratios were relatively constant, suggesting homeostasis. The
activity of hydrolytic enzymes, which are rich in N, decreased with
increasing elevation, while the ratio of enzymes involved in the acquisition
of N and P increased with increasing elevation, further indicating an
increase in the relative demand for N compared to P with increasing
elevation. We conclude that soil microorganisms shift investment in nutrient
acquisition from P to N between lowland and montane tropical forests,
suggesting that different nutrients regulate soil microbial metabolism and
the soil carbon balance in these ecosystems. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|