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《Journal of Beijing Forestry University》 2008-S1
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Estimation of wood density with the model of indirect adjustment.

NIE Min-li~(1,2) FENG Zhong-ke~(1,2) YANG Li-min~3 SUI Hong-da~(1,2) 1 Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Institute of GIS,RS & GPS,Beijing Forestry University,100083,P.R.China;3 China Non-ferrous Metal Resources Geological Survey Center,Beijing,100012,P.R.China.  
To avoid heavy workload and difficulty in weighing wood trunks with large diameter directly in the field, wood density is often adopted to obtain the weight.The key point of this method is to evaluate the average density.Based on the principle of least square and indirect adjustment model,two parameters,the density of both trunks without bark and the bark,and only the density of trunks without bark,were used to estimate the most probable value of the average density and to evaluate the model precision.Results show that indirect adjustment with the parameter of trunk density without bark had a difference of 0.13 g/cm between the estimated density and the actual density.It is a simple and practical method with high precision.
【Fund】: 国家自然科学基金项目(90302014)
【CateGory Index】: S781
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