The Spatial Suitable Habitat Model of Acacia decurrens in Mount Merbabu National Park

Yoko Untoro, Agus Hikmat, Lilik Budi Prasetyo

Abstract


Green wattle (Acacia decurrens) is an invasive alien species (IAS) found in the  Mount Merbabu National Park (TNGMb). This study aim to obtain spatially studies on habitat suitability models of A. decurrens in TNGMb region. In fact, this species became as a high invasive and dominance in the TNGMb and contributes the negative impact to the ecosystem. In addition, the result of this study should be useful for monitoring and controling efforts of A. decurrens. This research was conducted during April to May 2016 in TNGMb. Collecting and processing data were started the building a thematic maps that represent predictor variables (Altitude, Slope, Rainfall, Surface Temperature, River Distance, NDVI, NDMI, distance from the climbing route, and distance from the post-fired area). The survey was conducted with random sampling of presence or absence of A. decurrens by marking the coordinate point of location using GPS. Data analysis in this research was used binary logistic regression enter method. Binary logistic regression involves the data acquisition of the presence and absence of A. decurrens as the y variable, while the predictor variable map as the variable x. The type of spatial distribution of A. decurrens in the TNGMb was identified as clumped distribution. In addition, the Nagelkerke R2 values obtained in the model amounted to 39.2%, while 60.8% was explained by other variables not used in the model. The small value of Nagelkerke R2 in this study was due to the other variables (biophysical and disturbance variables) which high influence on the model have not been found. The results of the logistic regression model showed a high percentage of suitability of 64.29%, a medium suitability of 28.57%, and a low suitability of 7.14% then the Implications for monitoring and controlling activities of A. decurrens in TNGMb could be prioritized in high suitability habitat..

 

Keywords: Acacia decurrens, Green wattle, invasive, spatial suitable habitat 


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