Using linear mixed models to evaluate stand level growth rates for dipterocarps and Macaranga species following two selective logging methods in Sabah, Borneo

Abstract

To understand and predict the dynamics and productivity of the world's tropical rainforests after logging is a major challenge for ecologists and forest managers. Realistic forest-dynamics models for this biome are largely lacking. Using linear mixed models, we analyse basal area development for the commercially valuable tree species of dipterocarps and the fast-growing pioneer Macaranga spp., following two selective logging methods; supervised logging (SL) and conventional logging (CL) combined with- or without pre-harvest climber cutting (SLC and SL, and CLC and CL, respectively). After logging there was an initial period of about five years before recovery started. During the 18-year study period, the average stand basal area growth rates of the dipterocarp group in the SLC treatment was double that in the CL treatment, revealing a faster recovery. Eighteen years after logging, SL and SLC treatments recovered 93% and 84%, respectively, of the initial standing dipterocarp basal area, compared to 73% and 72% recovery for the CL and CLC treatments. SLC treatments reduced the overall establishment of pioneer species (Macaranga spp.) by about 45% in contrast to CL and CLC treatments. Our study provides a framework for evaluating and comparing growth rates in tropical forests for different logging methods. The results suggest that a combination of directional felling, pre-aligned skid trails and pre-harvest climber cutting can improve future yields in tropical rainforests.

Keywords

Basal area growth; Climber cutting; Dipterocarpaceae; LMM; Reduced impact logging; Sustainable forest management

Published in

Forest Ecology and Management
2019, volume: 437, pages: 372-379

SLU Authors

• Lussetti, Daniel

  • Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
    

• Ranneby, Bo

  • Department of Forest Economics, Swedish University of Agricultural Sciences
    

• Ilstedt, Ulrik

  • Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
    

• Falck, Jan

  • Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
    

• Karlsson, Anders

  • Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
    

Global goals (SDG)

SDG15 Life on land

UKÄ Subject classification

Forest Science

Publication identifier

• DOI: https://doi.org/10.1016/j.foreco.2019.01.044

Permanent link to this page (URI)

https://res.slu.se/id/publ/98575