Response models on the moisture change of surface fuel to fire environment in Cunninghamia lanceolata young plantation

Key words: 
• forest protection /
• Cunninghamia lanceolata young plantation /
• surface fuel /
• moisture content /
• fire environment /
• linear model

Abstract: In the springs of 2003 and 2004 , the main fire environment and the moisture content (y)of surface fuel in Cunninghamia lanceolata young plantation at southwest near to Fujian Forestry College , Nanping were continuously inspected and determined in order to illuminate their interrelation .In this paper , the independent variables of wind speed (x1), air relative humidity (x2), air temperature (x3)and the land surface temperature (x4), and the moisture content of surface fuel (y)are presented with the polynomial approximation .And the multivariate linear models of x1 , x2 , x3 , x4 are established by the multivariate linear regression .After that , the authors tested the significant of multiple correlation coefficients and partial correlation coefficients with t-test , and calculated also the simulation precision of the selected three models .The results show that wind speed is not proper to construct regression models with the moisture content , on the contrary , the model with x2 , x3 , x4 , is best (y =42.345 +0.736x2 -1.011 x3 -0.981x4).y =33.406 +0.541x1 -1.538x3 and y =19.049 +0.630x2 -1.147x4 are also more precision .Lastly , the authors suggest that the response models with x2 and x3 should have been more studied in order to find a fast , accurate index to replace the moisture content .[ Ch , 3 tab .16 ref .]