Modelling understorey light for seedling regeneration in continuous cover forestry canopies

Journal Article (Academic article)

Continuous cover forestry (CCF) aims at enhancing stand structural diversity and favouring natural regeneration. To give guidance on how to manage a CCF stand to achieve seedling growth below canopy, an estimate of light transmittance is required. So far, in the UK, only stand-level parameters have been used by managers to predict the understorey light in CCF stands. We assessed a UK Sitka spruce stand undergoing transformation to CCF and measured canopy transmittance using hemispherical pictures. Stand-level characteristics were found to be highly stand specific and not appropriate to predict seedling growth in CCF stands. We parameterized a detailed light model (4C-A-RTM) and a simple one-layer turbid medium model (BL). A sensitivity analysis was performed to test the effect of key stand structural parameters on the modelled transmittance. Measured transmittance from hemispherical photographs was used to validate the models. Both models tended to underestimate canopy transmittance but were positively related to current-year growth of the below canopy seedlings (R(2) = 0.92, P

Full Text

Duke Authors

Cited Authors

  • Bertin, S; Palmroth, S; Kim, HS; Perks, MP; Mencuccini, M; Oren, R

Published Date

  • October 2011

Published In

Volume / Issue

  • 84 / 4

Start / End Page

  • 397 - 409

International Standard Serial Number (ISSN)

  • 0015-752X

Digital Object Identifier (DOI)

  • 10.1093/forestry/cpr026