No abstract

Mount Mujil is an ancient volcano which is located in Kulon Progo district with elevation of 265 msl. Currently this area is mostly overgrown by various vegetations, in which one of them is tree strata vegetation. Researches regarding the vegetation has not been done quite much. Hence, this research aims to understand the tree strata vegetation types with the highest and lowest Important Value Index (IV), determining the variety of tree strata vegetation types, understanding the correlation between measured abiotic environment condition to the stand grouping pattern of the tree strata vegetation, determining the potential of the research result as a learning source for biology subject in first grade of senior high school in ecosystem-level biodiversity subject. The data sampling in this research used plotless method such as Point Centered Quarter. To understand the diversity index (H'),Shanon-Wienner Index was used, and to understand the correlation between the measured abiotic environment conditions against the stand grouping pattern, cluster analysis was used. The research result is discussed to see whether this research has potentials to be used as a learning source for biology subject in accordance to the learning source criteria. The research result shows that there are 18 tree strata vegetation types in every study area with Tectona grandis as the highest IV(126.48%) and Ficus septica has the lowest INP (0.22%). The diversity index of the tree strata vegetation types is relatively low. H'ranges around 0.49-0.85. The abiotic environmental conditions which are related to the stand grouping pattern aresoil moisture, soil pH, and light intensity. The discussion regarding the research process and result fulfill the criteria to be a learning source for biology subject in first grade of senior high school in ecosystem-level biodiversity material.

The environment as a biology learning source has not been broadly used by teachers in the learning process, particularly for high school students. One possible area to be used as a high school biology learning source is Ijo Ancient Volcano located in Kulon Progo and Purworejo Regencies. The purpose of this study is to identify the types of herbaceous stratum vegetation with the greatest and smallest roles based on their importance value index (IV), the diversity index of herbaceous species, relationships of measurable abiotic environmental conditions with herbaceous stand grouping patterns, and the potential of the research results as a learning source for the material of biodiversity in grade X high school biology. The method used for data collection is point intercept. The vegetation parameters measured comprise dominance, frequency, relative dominance, relative frequency, and IV. The herbaceous species diversity index was calculated using the Shannon-Wiener formula. Cluster analysis was employed to determine the relationships between measurable abiotic conditions and the clustering patterns of the herbaceous stands. A descriptive method was used to assess the potential of this study's results as a biology learning source.The results show that the herbaceous species with the greatest role by IV was Oplismenus burmanii (66.38%), and the smallest role was that of Calocasia esculenta (0.34%). The diversity index of herbaceous vegetation species ranged between 0.10 and 0.12. The grouping of herbaceous stands was dIVded into two patterns. The abiotic environmental conditions related to the stand patterns of herbaceous plants were air humidity, soil moisture, soil temperature, soil pH, and light intensity, while air temperature did not correlate with the grouping patterns of herbaceous stands. The descriptive study indicates that the results of this study have the potential to be a grade X high school biology learning source for the material of biodiversity ecosystem level.