The Choice of Variables Transformation and Estimate of Measurement Error Matrix for the Study on Density diameter Relationship A Study on Impact of Measurement Error on Whole Stand Model Modeling the Relationship between Yellow Horn Seedling Growth and Soil Moisture Content Carbon Stocks Model of Compatible Individual Tree in the Natural Larch Forest of Daxing’an Mountains Comparison of the three linear models applied for studying of the correlation of site-indexes between Cunninghamia lanceolata and Pinus massoniana stands