Abstract
Up to 2019, tropical rainforests in East Kalimantan has been experiencing very rapid degradation and continues to shrink. Therefore, it is necessary to evaluate mapping and analysis of factors affecting the productivity of tropical rain forests in East Kalimantan. The purpose of this study was to determine the factors that cause shrinkage of tropical rainforests in East Kalimantan based on spatial statistical perspectives. The data used were secondary data from the Indonesian Ministry of Forestry and the Central Bureau of Statistics. The data consisted of 10 districts/cities from East Kalimantan Province. Those data were influenced by spatial dependence and spatial heterogeneity. Nonparametric Geospatial Regression (NGR) is one of the spatial statistical methods used to overcome spatial dependence and spatial heterogeneity. The results of the study obtained was a Nonparametric Geospatial Regression modeling using the Gaussian Kernel geographical weighting function with a minimum CV value of 1.48. The model had R2 values for each district/city ranging from 74.39% - 88.65%.  The goodness of fit of the NGR model was shown by the value of R2 = 0.8865, which stated that the variables that significantly affect the preservation of tropical rainforest by 88.65%  were the area of protected forests, nature reserves and nature preservation, production forests, area of each district/city, economic growth rate and regional development index.
Highlights
According to data from the Ministry of Forestry, the forest area of East Kalimantan in 2012, around 14,981,978 hectares experienced shrinking
Until 2018 the forest area in East Kalimantan continues to shrink; it is necessary to evaluate the handling of tropical rain forests in East Kalimantan
District/city that had the largest area of tropical rainforest was West Kutai District with an area of 2,500,103 hectares
Summary
According to data from the Ministry of Forestry, the forest area of East Kalimantan in 2012, around 14,981,978 hectares experienced shrinking. East Kalimantan has lost a forest area of 6,418,470 hectares in one year, and this value is not small and can have a negative impact if it continues. Tropical rainforests are degraded very quickly, many people and social organizations want to save the forest, but saving the forest will not be easy. This action requires the efforts of many parties who work together in order to preserve the forest and its wild nature; it can survive for future life. The goal of sustainable development in the forestry sector is to manage forests sustainably, to fight desertification, to stop and to reverse land degradation, and to stop the loss of biodiversity
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