Projection of tree growth and timber volume following strip clear-cutting in the Peruvian Amazon

Aboveground carbon dynamics following strip clear‐cutting in the Peruvian Amazon

“…The mean annual temperature is 26.5°C and the mean annual precipitation is 2521 mm (Spichiger et al 1989). A relatively dry period occurs from June to August, but rainfall varies highly each month of the year Rondon et al 2009b). Soils are sandy-loam and the vegetation is considered lowland tropical rainforest on high terrace (Spichiger et al 1989).…”

“…AGB (kg) values were divided by 1000 to obtain values in megagrams (Mg), equivalent to 1 ton. To standardize height measurements taken in the postclearing censuses, we developed an allometric equation for total height (h) (3) using diameter and height data of harvested trees in JH (p value £ 0.05, r 2 = 0.83) (Rondon 2008;Rondon et al 2009b).…”

“…Furthermore, commercial stems had low diameter growth rates (<0.3 cm year À1 ) even after the application of silvicultural thinning (Dolanc et al 2003). Growth projections predicted a low timber production (3-8 m 3 ha À1 ) at the time of a second harvest (Rondon et al 2009b), which questions the long-term sustainability of the system Rondon et al 2010).…”

Impacto da exploração madeireira na diversidade genética e área basal de jatobá na Amazônia sul-ocidental

“…For., Piracicaba, v. 44, n. 111, p. 545-555, set. 2016 DOI: dx.doi.org/10.18671/scifor.v44n111.01 regulamentados de manejo sustentável têm revelado que as premissas da sustentabilidade florestal não têm sido alcançadas para a maioria das espécies comumente exploradas (MOSTACEDO; FREDE-RICKSEN, 1999;DAUBER et al, 2005;DEGEN et al, 2006;GOURLET-FLEURY et al, 2005;PARK et al, 2005;SIST, 2007;SEBBENN et al, 2008;RONDON et al, 2009;ROZENDAAL et al, 2010).…”

Assessment of economic sustainability of the strip clear-cutting system in the Peruvian Amazon

“…Furthermore, commercial stems in this system had low diameter growth rates, averaging b0.3 cm/yr even after the application of silvicultural thinning (Dolanc et al, 2003). When the growth of all commercial trees ≥6.5 cm dbh from the strips was projected, realistic and optimistic growth models predicted that only 3-8 m 3 /ha of merchantable timber would be produced at the time of a second harvest, whereas the most optimistic growth model, or growth potential model, predicted a production of 32-38 m 3 /ha (Rondon et al, 2009b). Nevertheless, it is still unknown whether this production would be sufficient to make this system economically sustainable in a second harvest, since high costs for harvesting and implementing this system have been reported Gram, 1997;Southgate, 1998).…”