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This study determined the relationship of barometer earthstar (Astraeus sp.) and Shorea obtusa Wall. ex Blume from various fire frequency plots in the dry dipterocarp forest of Huai Kha Khaeng wildlife sanctuary, Uthai Thani province, where the past experiment showed high relation between position of S. obtusa and barometer earthstar mushroom occupy position. The experiment was established ten permanent plots of 100 x 100 Sq.m. (1 ha) in dry dipterocarp forest where S. obtusa and S. siamensis were dominated species and these plots were treated with different fire frequencies for 9 years, from 2008 to 2016. All collected data were started only in 2016. Data of S. obtusa in diameter at breast height (DBH) from 4.5 cm and above were collected and their co-ordinates were recorded before collecting mushroom data. Data of mushroom production were recorded from April to July, total weight and co-ordinates of mushroom occupying areas were collected daily. The simple linear regression was used to find the effect of S. obtusa density and fire frequency on mushroom’s weight. Then, 100 x 100 Sq.m. plots were separated to 25 x 25 Sq.m. plots (16 plots), data of mushroom and number of S. obtusa in each size classes were calculated, and the analysis of covariance was used to find the relationship of mushroom production with different DBH size classes of S. obtusa. The results showed that S. obtusa was dominant species in all plots with different DBH size classes. It was also found that mushroom distribution and weight did not correlate with DBH size classes of S. obtusa. Moreover, high relationship between mushroom’s total weight and S. obtusa density was observed in burn plots with the higher fire frequency. Linear equations with values of R2 of annual burn plots, 1-year alternate burn plots, biannual burn plots, every 6-years burn plots were Y = 50.866X - 416.82, R2 = 0.8428; Y = 40.22X - 262.25, R2 = 0.8355; Y = 27.371X - 246.5, R2 = 0.7355 and Y = 31.084X - 434.33, R2 = 0.2735, respectively. The linear equations of annual burn plots, 1-year alternate burn plots, and biannual burn plots could be used to predict mushroom production by using S. obtusa densities in dry dipterocarp forest, where S. obtusa and S. siamensis were dominated species, in normal climatic year.
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