Study of humidity dynamics influence of forest over soil substrate at seed Pinus sylvestris L. germimination by the experimental «lysimetric» method. Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii

Abstract

It was developed an outdoor method of accomplished studies of different types over soils substrates and pine seeds germination. The main idea is a micro ecological combining of seeds places and determining of substrate moisture. The upper substrate layer in inviolate added with experimental seeds puts in lysimeter (cylindrical microcontainer or "lysimeter", which was nested in natural background at the same level with the substrate surface) and was daily weighted on accurate electronic weights, within 20 days. In experiment with lysimeter we used 4 types of forest substrates: inviolate and burnt green moss (Pleurozium schreberi (Вrid.) Mitt.) from lingonberry-bilberry-green moss pine forest and similar types of sphagnum moss (Sphagnum girgensonii Russ.) from rosemary-cassander-sphagnum pine forest. In the first five experimental days lysimeters were synchronously and evenly watered, thus we simulate a natural «recovery» rainfall series. At the result the most favorable moisture regime favorable moisture and as the reason 2-3 times higher germination of pines seeds, were indicated in intensively burnt green moss substrate – 69%. Due to the water-absorbing and water-retaining sphagnum mosses features, moisture supply level of inviolate substrate was insufficient for successful pines seedes germination and it final germitation was near 20%. Burnt sphagnum substrate have a near 2.5 times more volume mass than inviolate substrate, and as a consequence, volume moister , what caused to 2 fold (39%) more successful seed germination, compere with un burnt substrate. The difference in dynamic quantity seedlings between inviolate and burnt substrate, is explained post-fire outbreaks of natural pine populations regeneration.