植物共同体の定量的表示に関する2,3の試み : I POLYA-EGGENBERGER型の識別式λ=(h+xd)/(1+d)を応用する方法

抄録

1. In this paper, new methods of representing the dominance in a plant community are introduced. To discriminate coarsely the distribution type of POLYA-EGGENBERGER on a plant community, λ=(h+xd)/(1+d) diagram is usually used, where h is x^^- and d is 1-v/x^^- for the maximum likelihood estimate. A new method of representing the dominance in a plant community applied with λ=(h+xd)/(1+d) diagram is discussed here. The points obtained from the equation (λ=(h+xd)/(1+d)) draw a straight line in the first plane constructed from two axes. The author found that the dominance in a plant community is closely related with the angle constructed from the straight line and x-axis. 2. Concerning the relation between the distribution type and the angle, probability of the distribution of samples shows an ascending line in case of the POLYA-EGGENBERGER type, a nearly parallel line to x-axis in case of the POISSON type, and a descending line in case of the binominal type. 3. The angle constructed from the ascending line and x-axis is not exceed about 40°. 4. To examine the distribution of the number of individuals or the coverage of clover in quadrats, it is desirable to use 1-meter-quadrat. 5. The distribution type varies with time in such a process as POISSON type → POLYA-EGGEN-BERGER type → POISSON type → binominal type.