This study uses simulations to investigate the effects of implementing two different Japanese forestry subsidy systems on timber production and carbon stock, and examines the consequences for harvesting strategies. An existing Local Yield Table Construction System (LYCS), a wood conversion algorithm, and a harvesting cost model were used in the simulations to test the applicability of different subsidies to the thinning of stands. Using forest inventory data collected by local government staff, simulation output was used to calculate forestry profits, carbon stocks, subsidies, the amount of labor required, and the cost effectiveness of investing in subsidies. By comparing the output of simulations based on two scenarios, we found that both the clear-cutting area and the amount of harvested timber were larger under Scenario 2, in which the rules governing subsidy allocations are more relaxed, than under Scenario 1, in which the rules are more restrictive. Because the harvested timber under Scenario 1 was mainly produced by clear-cutting, the forestry profits and the subsidy predicted in the early period of the simulation, were larger under Scenario 1 than under Scenario 2. In contrast, the carbon stock was larger under Scenario 2 than under Scenario 1. The simulation model is likely to be useful for improving Plan-Do-Check-Act cycles Foundation project:

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The development of empirical bioniass models has gained a great deal of attention during recent decades. These models have been constnicted to facilitate the quantification of forcst biemass and carbon sequestration benefits, but few empirical models exist for estimating the stand biemass of teak (Tectona giz7tdts L.D plantatiens. This study thereforc sought to develop stand-level biomass models that use minimum input data for teak plantations in Central Java, Indonesia. Stand biomass and other stand variables were derived [rom ferest inventory duta in Balo {Kebonhario, Central Java). We used ]inear and nonlinear regt'ession to develop four types of biomass models/ volume to biomass, basal area to biomass, age to biomass, and age and basal area to biomass, These models were then validated ush]g an independent data set. Results indicated that teak stand biomass was accurately estimuted using the volume-to-biomass model.

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