Decline phenomenon is one of the most important reasons for the destruction and mortality of oak trees in Zagros forests due to the wide variety and diversity of the topography of its determination through track and field operations is not readily possible. Changes in an ecosystem are often gradual changes, but sometimes changes occur in an ecosystem in a short time. This change can cause a catastrophe in the ecosystem, which is difficult to identify. A proposed method for identifying a general change in time series is use the BFAST model, which, by analyzing the time series in the process, season, and residual components, identifies the changes in the time series and also repeatedly estimates the time and amount of the changes, and The path and amount of variation in this study, using this model and satellite images to monitor and evaluate the changes in coverage and decline of oak forests in Lorestan province during the statistical period (2000-2017). The results showed that more than 42804 hectares (1.5%) of the oak forests of the province were lost due to the decline phenomenon during the studied period. Also, according to the BFAST method, the trend diagram is a failover and their frequency variations are irregular. Comparison and study of different forest coverings also showed a decrease in NDVI, which indicates that the process of decreasing forest cover is inclusive. The study of autocorrelation and Kendal coefficient showed that there were significant changes and severity of failure (-0.7) in the area Study. The seasonal chart also has uneven and irregular variations due to changes in oak forests in the region. The results of this research can be used to study the changes in the coverage of oak forests in the area and management and the way to think about this phenomenon.

High-rise buildings, by being recognizable in their context and signaling the introduction of urban integrity, have an impact on the perception and formation of citizens' mental image of the city. The present study examines the environmental perception of citizens in the interpretive, emotional, cognitive, and evaluative dimensions of high-rise buildings in Tehran’s 22th district as a case of study and emphasizes the formal, functional and semantic aspects of these buildings on citizen perception. The search system is intended for interpretive-structuralism research and the content analysis method (documentary method) is used in the theoretical section and the cross-sectional survey method. The population of the study consisted of 100 residents and non-residents of the area who are randomly selected. Data were analyzed by using SPSS software and Pearson correlation tests and one-sample T-test to evaluate the relationship between physical and semantic components in high-rise buildings perception and determine the importance of each environmental perception dimension.The results indicate that “the role of beauty of the form and shape of high-rise buildings” and “the amount of elevation congruence with the environment” in the first and second priorities affecting the level of citizens' environmental perception among physical and “The role of legibility and routing” as an effective factor among the semantic components in the perception of high-rise buildings has been based more on emotional and cognitive perception and less on the interpretative and perceptual dimensions of perceived citizenship.