New data on the distribution of Japanese white birch (Betula platyphylla Sukacz.) groves in Olyutorsky District (Koryak Okrug Kamchatsky Krai) are presented. The geobotanical description white-birch forests valley River Kailulovayam, a tributary Vyvenka, is given. Using dominantdeterminant approach were ascribed to association Betuletum platyphyllae fruticoso-varioherbosum. White-birch Koryak g...

Most manipulation experiments simulating global change in tundra were short-term or did not measure plant growth directly. Here, we assessed the growth of three shrubs (Cassiope tetragona, Empetrum hermaphroditum and Betula nana) at a subarctic heath in Abisko (Northern Sweden) after 22 years of warming (passive greenhouses), fertilisation (nutrients addition) and shading (hessian fabric), and ...

Silver and downy birch (Betula pendula Roth B. pubescens Ehrhs) are pioneer species which play an important role in forest regeneration disturbed areas. Knowledge of seed production dispersal is key to making good predictions the persistence colonization birch. Both processes can be affected by density trees neighbourhood. In this study, we studied two plots Wytham Woods, UK, 2015, investigated...

A birch pollen emission model is described and its main features are discussed. The development of the model is based on a double-threshold temperature sum model that describes the propagation of the flowering season and naturally links to the thermal time models to predict the onset and duration of flowering. For the flowering season, the emission model considers ambient humidity and precipita...

Let E/Q be an elliptic curve and p be a prime number, and let G be the Galois group of the extension of Q obtained by adjoining the coordinates of the p-torsion points on E. We determine all cases when the Galois cohomology group H ( G,E[p] ) does not vanish, and investigate the analogous question for E[p] when i > 1. We include an application to the verification of certain cases of the Birch a...