Analysis of Power Spectrum and Maximum Entropy Spectrum of DBH
Liu Yun-ha · 2015
Diameter at breast height is an important factor for tree growth,and it is widely used.Access to the Quercus mongolica DBH growth sequence of unit root test,found that two order difference when the data are stationary; on the two order difference sequence spectrum analysis method and the concept of entropy in information theory as the theory of maximum entropy spectrum analysis of periodic DBH growth by using the power to Fu liye transform based the winner,4.5 year cycle,in the current annual increment and average growth quantity are equal,about 4.5 years for three cycles,cycles two calculation have difference,the power spectrum method for 5.4 years,the maximum entropy spectrum method for 3.86 years.