Author : Hari Sulistiyowati

Summary : Three equations of ecological value appraisals for biomass, necromass, and soil organic matter (SOM) were developed. This ecological value was the sum of ecological structure (S) and function (F) values. The equations were applicable to get information on the current condition of ecological structure and function of certain natural ecosystems. This information can be used as database or ecological consideration to generate policy, to make decision, and to preserve the natural ecosystems. There were about 43 families, 67 genera, and 78 species of plants found in TMBNP. The diversity index of plant species in height : > or equal 1m was moderate (2.711), while others were low. The Aglaia argentea-Streblus spinosus were dominant plant species > or equal 1 m height, unidentified seedlings- Tetrecera scandens, Donax canniformis-Panuicum repens were dominant species of understory, while Schizostachyum zollinger-Caryota mitis were the dominant species of tree like. The plant species in equal or greater than 1 m height of MBNP contributed the highest forest biomass (nearly 3,500 Mg/ha) ecoval resulted in high carbon content (1,749 Mg/ha). Appraising ecological accounted about 601, 361-1, 081, 495 USD or 7,705,224,167-13,857,197,433 IDR per ha. Total of 8,650 pieces/ha woody debris were found at the site giving impact on their high volume (340.92 m3/ha). Log input was 7,410 pices/ha higher than both snags (700 pieces/ha). In conclusion, the total equations of ecological value indicated that there were tremendous stocking organic matters and carbon deposited as biomass, necromass and SOM that reflects good ecosystem health of Aglaia-Streblus forest in the MBNP. These ecovals should be preserved for conservation to maintain biodiversity, biogeochemical cycles, and to sustain ecological processes and functions at the forest site. All the management and policies correlated to this protected area should consider this valuable information for their forest management and policy.