Abstract
Physiognomy, ratio between percentage moss and herb cover, significant associations between species, and soil texture were used to group vegetation samples containing white spruce into community types.The averages of the "measured mean" pH, the minimum pH, and the maximum pH of three soil layers, the height growth of the white spruce trees, and the nitrogen content of the white spruce foliage of the community types were compared by t test. When a significant difference showed that the samples were drawn from different populations, this was taken to justify the acceptance of the community types as distinct entities with regard to the features investigated.Of the five community types originally recognized, only three were retained. They were respectively the Equisetum pratense type, the Equisetum arvense type, and a very variable community type typified by a more or less developed moss–herb–shrub vegetation.
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