Characterisation of Riparian Vegetation in the Onggobayan and Jlantah River Areas of Sukoharjo Regency, Central Java

Abstract

Human activities such as agriculture, industry, and settlements around rivers can affect riparian vegetation, which is crucial for river ecosystems. The main challenge in maintaining this vegetation is land use change, which can damage productivity and sustainability. In Sukoharjo Regency, Central Java, the Onggobayan River and the Jlantah River are riverine environments located in residential areas. This study aims to conduct an inventory to gain understanding of riparian biodiversity and its implications for river conservation and management. The research method involves observation using plots or square plots measuring 4 m², 25 m², dan 400 m² at each location which produces data about vegetation and riparian habitat. The calculations used in this research include Importance Value Index (IVI), Shannon-Wiener Diversity Index (H'), and Evenness Index (E) regarding riparian vegetation in the Onggobayan River and Jlantah River areas, Sukoharjo Regency. The results show differences and similarities between the two rivers. The diversity of the Onggobayan River is moderate (1.086), while the Jlantah River is low (0.86). The evenness of the Onggobayan River is moderate (0.347), while the Jlantah River is also moderate (0.304). The dominance of the Onggobayan River is low (0.342), while the Jlantah River is also low (0.492).