Growth dynamics of a seasonally dry tropical forest in the brazilian semi-arid

Abstract

Studies that aim to quantify and analyze the dynamics of vegetation growth provide information for the management and conservation of forests over time. Therefore, the main objective of this work was to analyze the dynamics and growth in basal area, at different intervals (2008-2016; 2008-2017 and 2008-2019), in two areas with different disturbance and use histories, in the municipality of Forest - PE. Forty permanent plots measuring 20 mx 20 m were installed, with data collection from the year 2008 to 2019, in two areas, A1: less conserved and A2: more conserved, in which individuals and shafts with a circumference of 1.30 were measured m from the ground ≥ 6 cm. The number of individuals and stems per species was verified, calculating the basal area at different intervals, rates of entry, mortality, gross and net growth, including and excluding entries. A decrease in the number of individuals and stems over the years was observed for both areas, however, there was an increase in the basal area of the A1, 2008: 3.1 m².1.6ha^-1; 2016: 3.8 m².1.6ha^-1; 2017: 3.9 m².1.6ha^-1 and 2019: 4.6 m².1.6ha^-1, while in (A2) the reverse occurred, with an initial basal area of 8.3 m².1.6ha^-1 ; 6.4 m².1.6ha^-1; 6.4 m².1.6ha^-1; and 7.0 m².1.6ha^-1, respectively, it was also found that in years with less rain the basal area had a lower mean value, the inverse is true, higher precipitated volume means an increase in basal area. Although A1 stood out, the high mortality rates of stems and individuals in all studied intervals caused the basal area to gradually decrease, the net growth was affected. basal, showing climate dependence, impacting forest dynamics.

Keywords:
Increment; Caatinga; Density; Ticket; Mortality