A survey on the average diameter of double-loop networks with non-unit step

The definitions of grain size,area,average area,chord,long axes,short axes,diameter and average diameter are given in this article.

The models for mean diameter,stand height and stand volume of natural forests are established by using the ground sample plots of Continuous Forest Inventory in Tibet.

This paper indicates that the formula \%f(c)=1+c\+2-1/c\% got from the relationship of stand arithmetical average diameter (\%\%), stand square average diameter ( D g) and diameter correlative coefficient ( c ) is the variable of normal function, and proves that the SADCP is between 54% and 56 8%.

The nonparametric kernel density theory and methods are introduced to model the diameter distribution of broadleaved Pinus koraiensis in Liaoning eastern mountains in contrast with the normal distribution and Weibull distribution.

stand for water resource conservation,the growth process and diameter distribution characteristic of Larix Principis-rupprechtii Plantation in 10 years old were studied using stem analysis method of sample tree,which had two density structures(one was 2 600 per hm2,the other was 3 500 per hm2) in water conservation forest region of Wutai Mountain in Shanxi Province.