Community structure of fruit tree species on successful marginal land conservation in Jombang Regency, East Java Province, Indonesia

Jombang Regency has critical land, especially in the north of the Berantas river due to a decrease in land quality including land, topography, climate, and water. This study aims to identify the structure of the fruit tree community in degraded land and the success of conservation from the cultivation of the surrounding community. The results of the study have identified 229 individuals from 21 species of fruit trees with 14 tribes on observation in 11 research sites. Analysis of fruit tree species abundance showed that longan and mango had the first and second-largest abundances with the relative abundance of 24.0% and 21.4%, respectively from the Sapindaceae and Anacardiaceae tribes. While the smallest relative species abundance is shown by melinjo with a value of 0.4%. Based on the analysis of the main components, it shows that the value of the longan and mango variance is quite high, indicated by the vector lines that move away from the centre, and while other species tend to gather at the centre because of the variance value is low. The grouping of individual fruit tree plants forms five groups and there are three species of fruit trees that are not included in the group because this species group has a fairly low AU / BP value of 51/10%, namely mango, guava, and star fruit. The results of this study indicate that the structure of fruit tree communities in degraded lands is more dominated by plants from the Sapindaceae and Anacardiaceae families which generally grow spread in 11 sample villages in the study area.