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ALFARO CURITUMAY, Lucero E et al. Dynamics, Aerial Biomass and Population Variables of two Permanent Plots in Montane Forests of Wiñaywayna, Machupicchu Historic Sanctuary, Cusco, Peru. Arnaldoa [online]. 2018, vol.25, n.2, pp.631-652. ISSN 1815-8242.

In the montane forests near Wiñaywayna within the Historic Sanctuary of Machupicchu (SHM), we evaluated the population dynamics, stored aerial biomass and the population variables of trees with DBH≥10, of two permanent plots of 1.0 ha each one, in the sectors of Intipunku (SHM-01) at 2653 m of altitude and Kantupata (SHM-02) at 3200 m of altitude, from September 2013 to November 2016 under the standardized RAINFOR methodology. We registered a total of 69 species in 1286 individuals; in plot SHM-01, 26 families, 36 genera and 45 species in 682 individuals, where the species with higher IVI were Meliosma peytonii with 33.50 %, Hieronyma oblonga with 29.23 % and Gordonia fruticosa with 28.43 %. In plot SHM-02, 22 families, 28 genera and 31 species in 604 individuals, where the species with the highest IVI were Weinmannia crassifolia with 70.82 %, which was also the most abundant and dominant, Ilex andicola with 35.65 % and Hedyosmum angustifolium with 35.09 %. A moderately high diversity was recorded, of 3.063 and 2.477 according to Shannon, 0.93 and 0.87 according to Simpson for Intipunku and Kantupata respectively with a very low similarity among them for sharing only 7 species, which means a different tree species composition in each plot. In SHM-01 there was 1.18 % mortality rate, 0.79 % recruitment rate and 0.99 % annual renewal rate and in SHM-02, 1.21 % mortality rate, 2.05 % recruitment rate and 1.63 % annual renewal rate, with an imbalance between these rates. The stored aerial biomass was higher in Intipunku at 145 ± 2.80 T ha-1, with a net primary productivity of 0.95 Tha-1year-1, the species Gordonia fruticosa and Aniba coto contributed higher biomass with 19 Tha-1 each; the biomass in Kantupata was 101.06 ± 3.46 Tha-1, with a net primary productivity of 1.18 T ha-1 year-1, the Weinmannia crassifolia species contributed greater biomass with 32 Tha-1

Keywords : RAINFOR; montane forest; tree biomass; dynamics; diversity; floristic composition; permanent plots.

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