Abstract
The aim of the present study was to assess the growth and energetic properties of genetic material of eucalyptus grown in several integrated crop-livestock system spatial arrangements in Barra-do-Garças City (MT). The genetic material of 76-month old Eucalyptus spp from eight spatial arrangements were assessed according to the following properties: diameter, height and volume growth, mortality rate, dry matter yield, sapwood to heartwood ratio, form factor, bark volume, basic density, superior calorific value, ash content, volatile matter, fixed carbon and trunk energy. Data analysis was performed by adjusting growth function, test for model identity and parameters equality and ANOVA tests to Scott-Knott’s mean clustering test. Eucalyptus grandis x E. urophylla clones from recorded the highest energy efficiency due to their high yield volume, which was decisive to determine estimated energy available per tree and cropland area. Growth, stem shape and basic density varied among, and within, the same genetic materials, depending on their respective spatial arrangement. However, solid biomass properties (high calorific value, ash content, fixed carbon and volatile matter) remained stable.
Highlights
The afforestation of conventional cropland, known as integrated crop-livestock-forest systems (CLFS) or agroforestry systems, is one of the techniques embraced by the National Plan for Brazilian Low Carbon Emissions in Agriculture (ABC Plan)
H05 was rejected for both variables of CL2, it proved the effect of spatial arrangements on diameter at breast height (DHB)
diameter at breast height (DBH) growth curves between CL1's A6 and A7 was not significant according to H05 and data of A1, A6 and A7 can be grouped for height comparison purposes
Summary
The afforestation of conventional cropland, known as integrated crop-livestock-forest systems (CLFS) or agroforestry systems, is one of the techniques embraced by the National Plan for Brazilian Low Carbon Emissions in Agriculture (ABC Plan). These systems are part of the commitment to reduce greenhouse gas emissions assumed by Brazil at the 15th Conference of the Parties (COP 15) held in Copenhagen, back in 2009. In Mato Grosso, crop-livestock integration covers 89% of this area, with the forestcomponent being present in only 11% of the area occupied (GIL et al, 2015). It is a risky strategy that may trigger insecurity, as the integration of unsuitable tree species into cropping systems and/or spatial arrangements most likely lead to trading issues and to decreased crop yield (DIAS-FILHO; FERREIRA, 2008)
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