Agroforestry systems can play an important role in mitigating the effects of climate change given their capacity to increase tree diversity and to store more carbon than conventional farming. This study aims at assessing carbon stocks and the use of shade trees in different coffee growing systems in the Northeast Peruvian Amazon. Carbon stocks in trees were estimated by field-based measurements and allometric equations. Carbon stocks in dead wood, litter and soil (upper 60 cm) were determined using field sampling and laboratory analysis. The diversity analysis drew on the Shannon–Weiner diversity index, and focus groups were used to obtain information about the local use of shade trees. The total carbon stock in the polyculture-shaded coffee system was 189 t C/ha, while the Inga-shaded and unshaded systems totalled 146 and 113 t C/ha, respectively. The soil compartment contributed the largest carbon stock in the coffee growing systems and contained 67, 82 and 96% of the total carbon stock in the polyculture-shaded, Inga-shaded and unshaded coffee systems, respectively. The Shannon–Weiner index and tree species richness values were highest for the polyculture-shaded coffee system, with a total of 18 tree species identified as important sources of fodder, food, wood, firewood and medicine. Therefore, coffee agroforestry systems play a significant role in carbon storage, while promoting conservation of useful trees in agricultural landscapes in the Peruvian Amazon.

El presente trabajo se desarrolló con la finalidad de optimizar una metodología de propagación vegetativa de sacha inchi (Plukenetia volubilis L.) a través del enraizamiento de estacas juveniles en cámaras de subirrigación. El estudio se realizó en 2 ensayos consecutivos en el Instituto de Investigaciones de la Amazonía Peruana, IIAP-San Martín. En el primer ensayo se probaron 2 tipos de sustratos y 5 dosis de ácido indolbutírico para la inducción de enraizamiento y en el segundo ensayo se evaluó 3 longitudes de estacas y 4 áreas foliares. Se logró el enraizamiento de estacas juveniles de sacha inchi en cámaras de subirrigación empleando arena de textura media como sustrato con aplicación de 0.2% de ácido indolbutírico como inductor hormonal y el uso de estacas basales o intermedias de 8 cm de longitud con áreas foliares de 50 y 100 cm2. El enraizamiento de estacas juveniles nos permitirá disponer de plantones con uniformidad genética y contribuirá al aprovechamiento sostenible de genotipos seleccionados por su aptitud agroindustrial.

The seeds of Plukenetia polyadenia have high levels of unsaturated fatty acids and are used as medicine and food for native people in the Peruvian and Brazilian Amazon. The objective of this study was to develop a method for vegetative propagation of Plukenetia polyadenia by rooting of cuttings. The experiment was laid out in a randomized complete block design with 12 treatments and 3 replications of 8 cuttings, in a 3 × 4 factorial arrangement. The factors were: 3 levels of leaf area (25, 50 and 75%) and 3 indole-3-butyric acid -IBA concentrations (9.84, 19.68 and 29.52mM) and a control without IBA. Data were submitted to analysis of variance and means were compared by Tukey test at 5% probability. Our results show that the use of cuttings with 50% of leaf area and treatment with 29.52mM of IBA induced high percentages of rooting (93%) and the best root formation. Vegetative propagation of Plukenetia polyadenia by cuttings will be used as a tool to conserve and propagate germplasm in breeding programs.Keywords: Plukenetia polyadenia, rooting, leaf area, IBA. Propagação vegetativa de Plukenetia polyadenia por estacas: efeitos de área foliar e concentração de ácido indol-3-butírico ResumoAs sementes de Plukenetia polyadenia têm altos níveis de ácidos graxos insaturados e são utilizadas como medicamentos e alimentos para as pessoas nativas da Amazônia Peruana e Brasileira. O objetivo do trabalho foi desenvolver um método de propagação vegetativa de Plukenetia polyadenia por meio do enraizamento de estacas em câmeras de sub-irrigação. Foi utilizado um delineamento de blocos ao acaso com 12 tratamentos e 3 repetições de 8 estacas, e esquema fatorial 3 × 4. Os fatores foram: 3 níveis de área foliar (25, 50 e 75%) e 3 doses de ácido indol-3-butírico -AIB (9,84; 19,68 e 29,52mM) e um controle sem AIB. Os dados foram submetidos à análise de variância e as médias foram comparadas pelo teste de Tukey a 5% de probabilidade. A maior taxa de enraizamento de estacas (93%) foi obtida com 29,52mM de AIB como indutor hormonal e estacas com área foliar de 50%. A propagação vegetativa de Plukenetia polyadenia por estacas será usada como ferramenta para conservar e propagar germoplasma em programas de melhoramento.Palavras-chave: Plukenetia polyadenia, enraizamento, área foliar, AIB.