Land use can affect ecosystems on land and their services. Because land use has mainly local effects, damage to ecosystem productivity due to land use should be modelled spatially dependent. Unfortunately, even though land use of impacts are particular importance for countries whose economies are highly agriculture-based, ecosystem productivity damage due to land use has not yet been assessed in Thailand so far. This study presents the method for assessing the damage to ecosystem productivity due to land use (land occupation and land transformation) in Thailand. Ecosystem productivity damage is expressed through net primary production (NPP). To convert the damage into monetary units, this study performs an economic valuation of NPP using the production function approach. The results show that the value of marginal product of NPP is around 10–15 Thai baht (THB) (1 USD ≈ 36 THB), per tonne dry weight biomass. The results are applied to the case of biodiesel production. The method presented in this paper could be a guideline for future land use impact assessment research. In addition, converting the NPP damage results into monetary units facilitates integration of impact assessment and economic analysis results for supporting decision support tools such as cost benefit analysis.

土地使用会影响土地上的生态系统及其服务。由于土地使用主要具有局部影响，因此应将土地使用对生态系统生产力的损害建模为与空间相关的模型。不幸的是，尽管土地使用影响对于那些经济高度依赖农业的国家来说尤为重要，但迄今为止，泰国尚未评估由于土地使用造成的生态系统生产力损害。这项研究提出了一种评估泰国土地使用（土地占用和土地转化）对生态系统生产力造成的损害的方法。生态系统生产力的损害通过净初级生产（NPP）来表示。为了将损害转换为货币单位，本研究使用生产函数方法对NPP进行了经济评估。 ≈  36 THB），每吨干重生物量。该结果适用于生物柴油生产的情况。本文提出的方法可以作为未来土地利用影响评估研究的指南。此外，将NPP损害结果转换为货币单位有助于整合影响评估和经济分析结果，以支持诸如成本效益分析等决策支持工具。