Plant and Soil

, Volume 364, Issue 1, pp 325–339

Root dynamics of Carex stricta-dominated tussock meadows

  • Beth A. Lawrence
  • Timothy J. Fahey
  • Joy B. Zedler
Regular Article

DOI: 10.1007/s11104-012-1360-y

Cite this article as:
Lawrence, B.A., Fahey, T.J. & Zedler, J.B. Plant Soil (2013) 364: 325. doi:10.1007/s11104-012-1360-y

Abstract

Background and aims

The roots of tussock-forming plants contribute to the formation of microtopographic features in many ecosystems, but the dynamics of such roots are poorly understood. We examined the spatial heterogeneity of tussock fine root dynamics to investigate allocation patterns and the role of root productivity in the persistence of tussock structures.

Methods

We compared the spatial variability of fine root (<1 mm, 1–2 mm) density, biomass, % live, allocation, turnover rate (using bomb 14C), and productivity of four Carex stricta Lam.-dominated tussock meadows in the upper Midwest, USA (3 reference, 1 restored site).

Results

Relative to underlying microsites, tussocks were warm, dry, and high in root density, productivity, % live biomass, and turnover. Root productivity averaged 649 g m−2 yr−1 (±208) in reference sites, comprised 57 % (±10) of total net production, and was concentrated in tussocks (70 % ± 4). Root turnover rate averaged 0.63 yr−1 (±0.08), but tussocks had ~50 % faster root turnover than the underlying soil, and <1 mm roots turned over ~40 % faster than 1–2 mm roots.

Conclusions

Our detailed analysis of the spatial heterogeneity of tussock root dynamics suggests that high allocation and elevated turnover of tussock roots facilitates organic matter accumulation and tussock persistence over time.

Keywords

Bomb 14CProductivityRoot turnoverSedge meadowTussockWetland

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Beth A. Lawrence
    • 1
    • 4
  • Timothy J. Fahey
    • 3
  • Joy B. Zedler
    • 1
    • 2
  1. 1.Department of BotanyUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Department of ArboretumUniversity of Wisconsin-MadisonMadisonUSA
  3. 3.Department of Natural ResourcesCornell UniversityIthacaUSA
  4. 4.Department of Environmental Science and StudiesDePaul UniversityChicagoUSA