DISTRIBUTION OF SOME WOODY SPECIES AT THE NORTHERN BOUNDARY IN UST’-LENSKIY NATURE RESERVE (YAKUTIA). COMMUNICATION I. KAYANDER LARCH Larix cajanderi Mayr
E. G. Nikolin1,2, I. A. Yakshina2
1Institute for Biological Problems of Cryolithozone, Russian Academy of Sciences, Siberian Branch, Yakutsk, Russia
2Ust’-Lenskiy State Nature Reserve, Tiksi, Russia
Keywords: лиственница, формы роста, местонахождения, продвижение на север, р. Лена, larch, forms of growth, locations, northern progression, Lena river
Abstract
The distribution of the Cayander larch Larix cajanderi Mayr within the northern boundary, on the right bank of the Lena river in Ust’-Lenskiy nature reserve in Yakutia is discussed in the article. In the studied area, normal, curved, curtain, semi-shelter and elfin forms of growth of the Cajander larch were recorded, and the geographical coordinates of their locations are given. Larch communities are distributed over 6 ecological-topological areas of the terrain: along the banks of the Lena river, between the Tit-Ary island and the mouth of the Chinke river; in the interfluve of the Chinke and Sobol’-Yuryage rivers; below the mouth of the Sobol’-Yuryage river; on the left bank of the Chinke river valley; on the right bank of the valleys of the Chinke and Chinke Salata rivers. On the right bank of the Lena river between the Tit-Ary island and upstream from the mouth of the Chinke river, larch forests are common with small gaps. Their last locations are found in the mouth part of the Chinke river. In the interfluve between the Chinke and Sobol’-Yuryage rivers there is a small number of semi-elfin forest growth forms of larch trees. The last reliably registered larch communities were found at a distance of 2.1 km below the mouth of the Sobol’-Yuryage river. On the left bank of the Chinke river valley, on the slopes of the northern exposure, 5 locations of larch were found. All of them are located below the confluence of the Chinke-Yuryage and the Chinke-Salata rivers, at a distance from the Lena river up to 1.4 km. On the right side of the valley of the Chinke and the Chinke-Yuryage rivers, on the slopes of the southern exposition, larch communities are more common and were observed at a distance of 3 km from the Lena river to (thirteen locations). In the valley of the Chinke-Salata river larch is found only in one place, on the slope of the southern exposure, at a distance of 0.5 km from the confluence with the Chinke-Yuryage river. The conservation regime of the territory eliminates the anthropogenic impact on the natural process of larch moving to the north, which makes it possible to organize and conduct long-term monitoring observations of the dynamics of forest vegetation in the far north.
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