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The rapid development and becoming the most dominant growing center at East Java Province, Surabaya City is affected by its periphery areas. This fact is shown by the core area act as an economic center and the periphery act as a settlement support, resulting in urban area widening, known as peri-urban area. This also indicate a domination of periphery area movement toward the core area in the form of people’s flow or population movement. However, the result of the observation shows a tendency of peri-urban problem occurrences such as traffic jam, flood, and slum area. Thus, it is necessary to determine its connectivity between the core area and its support area in urban-rural linkage framework for the aim of having a formulated anticipation effort to face those problems in the future. The analysis was done by quantitative and qualitative approach resulting Normalized Difference Built-Up Index (NDBI) of the year 2002 until 2018 which the conversion reach out 43,95% of non-built-up area to build up area due of the urban area widening. Also, the spatial interaction from the Gravity Model shows the strongest interaction force occurred at Sidoarjo Regency’s districts which directly adjacent with Surabaya City. It can be concluded that the peri-urban area at southern Surabaya have a significant urban rural linkage interaction strength from the population movement. This imply that prioritizing the infrastructure development is a step forward to solve the occurred problems. With a hope by understanding these facts will encourage the government to formulate the sectoral policies.

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The existence of trees in a region could be threatened because of their good forest damage due to natural factors such as fires and landslides, as well as human activities mainly due to illegal logging. This study aims to determine the composition of a tree in Bukit Ace in the sub Kuranji Padang. In this study using a survey method using a combination of methods to make trransek track and map examples. Transects were observed along the 20 meter by 10 mapped sample with a size of 10x10 meter Analysis of vegetation cover density, frequency, dominance, importance and diversity index. Based on research conducted at the Mount Ace Village of Mount Sarik District of Kuranji Padang, tree composition consists of 13 species and 172 individuals where species of trees by people who at least is Anacardium ocidentale ie 3 people whereas species with people most is Xerospermum intermedium (31 people) , Important values ranging between 6.107% -60.327%, of tree species that have significant value the highest is Xerospermum intermedium is 60.327% and tree species with important value lows are Evodia malayana namely 6.107%, while based on diversity index of forest in Bukit Ace classified as being abundant with value ID 2,351.