Evaluasi Distribusi Hara Tanah Dantegakan Mangium, Sengon Dan Leda Pada Akhir Daur Untuk Kelestarian Produksi Hutan Tanaman Di Umr Gowa PT Inhutani I Unit III Makassar

Abstract

The study aims to evaluate nutrient content and nutrient accumulation on above ground biomass and soil nutrient distribution and above ground biomass among the plantation forest stands.The study was carried out in Borisallo forest block of UMR Gowa of PT Inhutani I Unit III Makassar on forest stand plantation of mangium, sengon, and leda of 17 years of age and on virgin forest at Dystrustepts soil. The collected data were analysed descriptively.The study indicates that chemical characteristics of soil on leda stand is better than that of the virgin forest and the best of all other stands. Only the N content which is higher in the virgin stand than in any other stands in the plantation forest. The nutrient content of P, Ca, and Mg are higher in leda, whereas mangium has the highest content of K. Sengon has the least content of all observed nutrients. Mangium has the highest total biomass and nutrient accumulation (N, P, K, Ca, Mg) but sengon has the lowest. The accumulation of N, P, K of mangium is higher than the content found in the soil underneath the stand. On the contrary, Ca and Mg are found higher in the soil. Similar results are found in sengon and leda stands. Based on basal area and dominant height measurements the three-species plantations are considered low in productivity and categorised as site quality I. High clay concentration and soil depth are the main restrictions for good growth of stands and result in a low productivity of the three species stands.