STRUCTURE OF THE ANNUAL RING POOL IN COMMUNITIES OF SWAMP AND DRY PINE FORESTS BETWEEN OB’ AND TOM’ RIVERS. COMMUNICATION II. EXPERIMENTAL AND ANALYTICAL ASPECTS
S. P. Efremov, T. T. Efremova, A. V. Pimenov, T. S. Sedel’nikova
Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch
Keywords: bogs, dry lands, Scots pine, ecotopes, tree samples, age structure, tree ring arrays, growth signs, distribution criteria
Abstract
Using the example of excessively wet and dry pine forests represented by Scots pine ( Pinus sylvestris L.) growing on the northern boundary of the Ob’ and Tom’ interfluve, the experimental application of a new original technique for recognizing and assessing the chronological mosaic of rows of the width of annual rings in the form of individual alternations and group-fused (vector) sets is substantiated. The basic volume of the discussed material is formed by 13 sample plots with a sample of 1493 trees in the age range of 22-367 years. They contain 244702 annual rings, the total width of which in linear terms is 151788 mm. their indicative potential is described by total and unevenly distributed arrays of annual rings in large and small samples of trees from 11 to 280 pcs. The diagnostics and interpretation of the distributed pool of rings are considered in the context of the forest society in connection with different intervals of their variability in the signs of annual increments. The necessary distinction is made by the difference between the width of each subsequent ring and the width of the previous one. It is shown that the method of sliding-step comparison of rings-years not only reliably records, but also mutually separates the variants of the coincidence of years with an increase, decrease and duplication of trends in annual increments in the rows of the width of the rings. The concepts of conditionally starting and ordinary rings are introduced, of which the latter are numerically and in total width much larger than the former. The expediency of their involvement in the calculations of general and ecotope-divided trial areas of the lines of age differences is argued. In a comparative key, the separated signs of especially informative arrays of annual rings of swamp pine forests of post-fire genesis are assessed for the first time. It has been shown that in cases of spontaneous and anthropogenic elimination of forest stands, the species is capable of forming age generations and types of native maternal pine forests not only on former but also on derivative ecotopes.
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