Tree diversity in Medan Ahmad Yani Park

Medan is the capital city of North Sumatra Province. It is one of the biggest cities on Sumatra Island. Big cities in Indonesia generally have problems with environmental degradation. One of the efforts to preserve the environment in urban areas is to provide public green spaces. Ahmad Yani Park is a green space dominated by trees that grow compactly and tightly in 1.3 ha of area. The research has been conducted at Ahmad Yani Park, one of the favorite places for people to gather and enjoy the freshness of clean air. Research on tree diversity in several public green spaces is needed to conduct as one of the efforts to provide biodiversity data and information in urban. This research is aimed to analyze the tree structure, composition, and diversity in Ahmad Yani Park to support sustainable development goals, especially in an urban area. The parameters of vegetation collecting by using census methods. The condition of vegetation and environment were assessed by using relative density, Shannon Wienner Diversity Index, and Evenness Index. The Ahmad Yani Park contained 240 individuals of 32 species It dominated by 62 individuals of Mahogany (S. macrophylla). The dominant vegetation is in 20 - 150 cm diameter class (59%). It is a mature phase of tree. While the juvenile and seedling stage have 26% and 15%. The Ahmad Yani Park has 2.75 score of Shannon Wiener Diversity index. It means this park is moderate diverse with a fairly stable environment.