Abstract
This work examines whether management causes changes in evapotranspiration (ET) surface conductance (gs), aerodynamic conductance (ga) and the decoupling factor (Ω) in managed and natural forest sites in a tropical rain forest in the Amazon. The study was conducted in the Tapajos National Forest (FNT) in managed (logged) and natural (unlogged) forests, which have micrometeorological towers for data capture. For ET estimation, the Penman-Monteith (PM) and Eddy Covariance (EC) equations were used. The models were significantly different only for unlogged (PM 134.9±15.9 mm.month-1 and EC 100.9±11.1 mm.month-1), while the means of the logged site were PM 111.1±15.7 mm.month-1 and EC 108.5±18.3 mm.month-1. Each area has different characteristics for the surface variables, ga, gs and Ω, and therefore the sites were different from each other for the study variables. However, logged ET did not differ for the PM, while EC decreased in the year after the management intervention, and was then followed by an increase. Key words: Tapajos, water vapor, surface, aerodynamic conductance, decoupling factor.
Highlights
The Amazon has a key role in regional and global climate systems, in large part due to contributions to evapotranspiration (ET) of the surface and for the global carbon cycle
This work examines whether management causes changes in evapotranspiration (ET) surface conductance, aerodynamic conductance and the decoupling factor (Ω) in managed and natural forest sites in a tropical rain forest in the Amazon
Forest management causes a reduction of the impact on vegetation structure, and it can aid in faster return to evapotranspiration values of a primary forest reduced impact logging
Summary
The Amazon has a key role in regional and global climate systems, in large part due to contributions to evapotranspiration (ET) of the surface and for the global carbon cycle. The Amazon forest currently faces risks due to deforestation pressure and climate change (Randow et al, 2014). Forest management is a method of selective logging that limits damage to the forest by cutting lianas, doing road planning, using skidders with articulated wheels and conducting directional felling (Palace et al, 2007). Forest management research emphasized mainly silvicultural aspects and changes in species composition, but little has been investigated on postoperation changes in biogeochemical cycles and their.
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