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The conversion of forests into agricultural lands is a major cause of deforestation,particularly in the mountain ecosystems of north Thailand.It results in a rapid loss of biological diversity of both flora and fauna.In addition,the above-ground biomass (AGB),which can be a major source of carbon storage,is also decreased.This study aimed to predict the AGB in Doi Suthep-Pui National Park,Chiang Mai province,based on land-use/land cover (LULC) changes from 2000 to 2030.Landsat-5 TM (2000) and Landsat-8 TM (2015) satellite images were analyzed to predict LULC changes to 2030.Temporary plots (30 m × 30 m) were established in each LULC type for AGB analysis;trees with diameters at breast height ≥ 4.5 cm were identified and measured.AGB of all LULC types were analyzed based on specific allometric equations of each type.The results show that area of forest and non-forested areas fluctuated during the study period.Through the first 15 years (2000-2015),5％ (2.9 km2) of forest changed to either agriculture or urban lands,especially mixed deciduous forest and lower montane forest.There was a similar trend in the 2030 prediction,showing the effect of forest fragmentation and the resultant high number of patches.Total AGB tended to decrease over the 30-year period from 12.5 to 10.6 t ha-1 in the first and second periods,respectively.Deforestation was the main factor influencing the loss of AGB (30.6 t ha-1) related to LULC changes.Furthermore,habitat loss would be expected to result in decreased biological diversity.Consequently,a management plan should be developed to avoid unsustainable land use changes,which may adversely affect human well-being.