REAL CONSERVATION SCENARIOS FOR THE MATO GROSSO STATE
Analysis of landscape structural indexes for the microregions of Alto Teles Pires and Aripuanã.
Lima, INPE, firstname.lastname@example.org
Shimabukuro, INPE, email@example.com
Ribeiro, USP/LEPaC, firstname.lastname@example.org
Silva, UVic, email@example.com
Rizzi, INPE, firstname.lastname@example.org
Freitas, INPE, email@example.com
The state of Mato Grosso has been the historical entry route for occupation of the Brazilian Amazon. This process has been accelerated since the 1960s, and natural habitats were intensively converted into pasture and agricultural systems. This transformation, however, is not homogenous; varying degrees of anthropization can be found within the regions of Mato Grosso. Two areas were selected from the state’s land cover map, corresponding to the microregions of Alto Teles Pires (ATP) and Aripuanã (ARI). These were selected as they present distinct levels of degradation. The following classes compose the LC map: 1.Forest, 2.Cerrado, 3.Anthropized Area-I (pasture/ vegetation on initial succession stages), 4. Anthropized Areas-II (soybean cultures). In order to compare the spatial structure of these sites, two landscape metrics were selected: percent of class cover (PLAND) and distance from nearest neighbor (ENN). Sampling points were selected randomly at both study sites for statistical analysis. For each sampling point, were calculated initially for the forest class. Normality and ANOVA tests were applied considering location as the source of variation. Preliminary results show that mean PLAND for the Forest class were significantly different between regions (p < 0.05): PLAND(ARI) = 58.75% and PLAND(ATP) = 16.20%. Similar results were observed for ENN (U - test, p < 0.001) for the Forest class: ENN(ARI) = 1900m and ENN(ATP) = 14,051m. This result confirms the higher degree of anthropization at the ATP site and the good conservation status of ARI. ATP indexes indicated the presence of few remaining forest patches presenting a large degree of isolation. This scenario implies in loss of biodiversity by high habitat reduction and genetic flow impediment by isolation. In general, these results suggest that ARI may offer good conditions for maintenance of biodiversity, and that means should be established to prevent degradation of this site as observed for ATP. The latter region requires restoration practices, as it exhibits natural cover percentages and fragmentation worse than what is considered appropriate to maintain local biodiversity levels. A more comprehensive analysis considering metrics for all cover classes is being presently evaluated, to better understand the landscape structure of both sites and fully support the present conservation status hypothesis.
Science Theme: LC (Land Use and Land Cover Change)