Diversity and Estimated Above Ground Biomass of Shade Trees in Some Coffee-based Agroforestries, Banyuwangi Regency

Abstract

This study was aimed to assess the diversity and estimate the above-ground biomass (AGB) of the shade tree in several coffee-based agroforestries in Banyuwangi, East Java. The data was collected from three villages, i.e. Gombengsari, Papring, and Kopendukuh. Vegetation analysis and biomass measurement were conducted by measuring the tree DBH (Diameter at Breast Height) in a square block plot 25 m x 25 m. The allometric formula was used to estimate the AGB, with wood density referred to ICRAF. The results were described descriptively. A total of 30 tree species were found as shade trees. Coconut (Cocos nucifera) has the highest important value index due to its high survival rate, easier maintenance and economic benefits. We found three types of shade trees: complex, simple, and single shade trees. The simple shade tree coffee-based agroforestry was mostly found in three villages. The highest species richness and the highest diversity of shade trees (1.93) was found in complex coffee-based agroforestry in Papring Village, followed by simple shade trees in Gombengsari (1.64), Papring (1.30), and Kopendukuh (1.13). The highest density and basal area were found in Gombengsari, which related to the highest AGB that measured in simple shade trees coffee-based agroforestry of Gombengsari for 47.110 ton.ha-1. With a total AGB of 30.203 ton.ha-1 , Kopendukuh single shade tree coffee-based agroforestry has a higher AGB than complex shade trees coffee-based agroforestry in Papring (13.713 ton.ha-1), due to the age of shade trees planted in the agroforestry lead to the higher rate of DBH.