Carbon turnover and export by selective logging in NW Mato Grosso, Brazil
Ted
R.
Feldpausch, Cornell University, trf2@cornell.edu
(Apresentador)
Stefan
Jirka, Cornell University, sj42@cornell.edu
Susan
J.
Riha, Cornell University, sjr4@cornell.edu
Carlos
A.
Passos, Universidade Federal de Mato Grosso, capassos@terra.com.br
Johannes
Lehman, Cornell University, cl273@cornell.edu
Franklin
Jasper, Rohden Indústia Lígnea Ltda, franklin@rohden.com
Erick
C.M.
Fernandes, Cornell University, ecf3@cornell.edu
Logging methods such as reduced impact logging strive to minimize damage during logging operations and harvest timber sustainably. We examined carbon export in whole logs and carbon accumulation as coarse woody debris (CWD) produced from forest damage during all phases of the first and second year of a certified timber harvest in SW Amazonia. Our measurements included a 100% survey of roads and log decks, assessment of canopy damage and ground disturbance in skid trails and tree-fall gaps, and measurement of total carbon exported from the site in logs. Road and log deck building crushed 6 and 1 trees per ha logged in the 10-60 cm DBH class, disturbed areas of 100 and 24 m2 ha-1, respectively, and combined disturbed about 1.5% of the forest. Logged gaps constituted the greatest disturbance (11% of the forest) on the basis of both area (202 m2 per tree logged) and CWD generation (18 Mg ha-1). In gaps, felled trees severed or crushed 10 trees ≥10 cm DBH per tree logged, which corresponded to 14.7 Mg ha-1 of CWD. Logging activities significantly reduced leaf area in roads, log decks and gaps, with the greatest reduction (48%) in log decks and least in logged gaps and roads compared to undisturbed forest. A total of 39 species were harvested. Carbon export in whole logs (3.5 Mg ha-1) represented 2.3% of the total standing forest carbon. The spatially explicit logging and harvest intensity data of disturbance, damage, and carbon export and turnover we present advances our understanding of the effect of certified selective logging on tropical forest dynamics of the Amazon Basin. Based on our results, we propose that certified timber harvest under selective logging is a viable option to reduce damage and CWD production compared to traditional selective logging practices.
Submetido por Ted R. Feldpausch em 06-ABR-2005
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)
Sessão: CD-I: Dinâmica do carbono em ecossistemas florestais: vegetação, serrapilheira e solo