Influência da precipitação pluviométrica nas taxas de crescimento de raízes na floresta nacional de Caxiuanã-Pa

• Autor(a) principal: Souza Júnior, José Augusto de
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5241
• topic: Floresta; Raízes; Precipitação pluviométrica; Forest; Roots; Rainfall; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA::MICROMETEOROLOGIA

Studies about root biomass estimates and its growth, particularly in forest ecosystems, has been intensified lately by the role played by forests in carbon sequestration and the possible consequences under conditions of climate change. This study aimed to analyze the behavior of root growth of trees in the Caxiuanã PA forest under different soil temperature and moisture and rainfall exposure conditions, from January 2009 to March 2010. This experiment was done in Caxiuanã National Forest - PA, in the site of the ESECAFLOR Project (Experiment of Dry in Forest), located in the Ferreira Penna Scientific Station (FPSS), municipality of Melgaço - PA. The monitoring data of soil temperature and moisture and the root growth was made in two areas, one hectare each that belongs to ESECAFLOR Project (A and B). The parcel "A", consisted of an area under natural conditions, called control parcel. In parcel B , was made the installation of 5000 plastic panels to a height of 1.5 to 4 meters above the ground, enabling the exclusion of approximately 90% of rainwater. Data collection of root growth was assessed monthly, from October 2009 to February 2010, using 18 rhizotrons. The total root growth rate was higher in the control parcel A , where the root growth rate was positively correlated with precipitation, showing the high dependence of water for forest development.