Seppo Kaunisto

Rauduskoivun (Betula pendula) ja hieskoivun (Betula pubescens) luontainen uudistuminen turpeennoston jälkeisellä suonpohjan turpeella Kihniön aitonevalla

Kaunisto S. Rauduskoivun (Betula pendula) ja hieskoivun (Betula pubescens) luontainen uudistuminen turpeennoston jälkeisellä suonpohjan turpeella Kihniön aitonevalla.

Tiivistelmä

A pine afforestation experiment was set up on a peat cut-away area at Aitoneva, Kihniö (62°12'N, 23°19'E, elev. a. 160 m) in the spring of 1979. By the autumn of the same year the area had been naturally stocked with a great number of Betula pendula and B. pubescens seedlings. In the spring of 1980 an inventory was carried out to find out the effect of the various fertilization and soil amelioration treatments on the number of Betula pendula and pubescens seedlings and on their growth during the first growing season. There were 96 sample plots (20 m x 15 m). On each plot 16 systematically chosen plots, sized 0.25 m2, were measured. The number of normal, leader damaged and dead seedlings were recorded on each circular plot as well as the height of the tallest Betula pendula and pubescens seedling. The various fertilization and soil amelioration treatments are presented in Table 1. The birch row along the road on the western side of the experimental field (Fig. 1 and Table 2) was the main seeding tree stand. The number of birch seedlings was very high near the seeding trees. Even 100 metres from the row there were far more seedlings than are required by practical forestry (Fig. 2, Table 3). By adding phosphorus, potassium, nitrogen and wood ash, the number of seedlings increased (Tables 4 and 5, Fig. 3). Liming had an adverse effect and the fertilization with micronutrients affected sometimes negatively, sometimes positively (Table 5). In their first growing season the seedlings grew the better, the more they received phosphorus and potassium (Table 6 and Fig. 4). Similarly, nitrogen fertilization improved the growth of, seedlings. The best growth was achieved on wood ash fertilized plots and the poorest on limed plots (Table 7). A very good Betula pendula and B. pubescens seedling stand was naturally reproduced with the aid of quite few seeding trees on a peat cut-over area. Such seedling reproduction, as it entails no costs, should be further studied and considered as one of the alternatives in producing wood material for energy production.

Vastaanotettu 31.10.2017 Julkaistu 1.1.1981

Katselukerrat 2788

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