3种林型内大型真菌群落多样性取样强度

Sampling Intensity for Community Diversity of Macrofungi in Three Types of Forests

以针阔混交林、针叶林、阔叶林3种林型为代表,在吉林省哈泥国家级自然保护区研究了大型真菌群落多样性的取样强度。巢式样方种—面积曲线结果表明:3种林型的最小取样面积均为8 m×8 m至16 m×16 m。Pielou积累样方多样性指数—样方数目曲线结果表明:针阔混交林的10 m×10 m、15 m×15 m、20 m×20 m样方最小取样数分别是6、3、2个;针叶林和阔叶林的10 m×10 m、15 m×15 m、20 m×20 m样方最小取样数均是5、3、2个。群落水平结构的复杂性导致取样数目的增加。当积累样方数超过最小取样数后,多样性指数—样方数目曲线进入平衡状态,上述3种取样面积的结果趋于一致,并在概率95%水平差异不显著。较大数目的小面积样方的取样策略更好。

A survey was conducted to study the sampling intensity for community diversity of macrofungi in Hani National Nature Reserve, Jilin Province, taking the mixed coniferous and broad-leaved forest, coniferous forest and broad-leaved forest as representatives. Species-area curves for the nested quadrats showed that the minimum area of these three forest types ranged from 8m×8 m to 16 m×16 m. The results of Pielou＇ s pooled quadrats showed that the minimum numbers were 6, 3, and 2 for 10 m×10 m, 15 m×15 m, and 20 m×20 m of square quadrats in the mixed coniferous and broad-leaved forest, and 5, 3, and 2 for those in both the coniferous forest and the broad-leaved forest, respectively. The complexity of commu- nity structure resulted in an increase in sampling number. The diversity index-sampling number curve reached a state of e- quilibrium when the pooled quadrats outnumbered the minimum sampling. The above three types of sampling area got con- sistent results, with an insignificant difference at a probability level of 95%. It is better to set up a large number of small Quadrats.