ТИПЫ ЖИЗНЕННЫХ ФОРМ АСТРАГАЛОВ СЕКЦИИ XIPHIDIUM BUNGE И ИХ ЗНАЧЕНИЕ ДЛЯ СИСТЕМАТИКИ РОДА

• Main Authors: Мякшина, Татьяна, Шауло, Дмитрий
• Format: Text
• Language: unknown
• Published: Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский государственный университет" 2011
• Subjects: ЖИЗНЕННЫЕ ФОРМЫ; СЕКЦИЯ XIPHIDIUM; АЗИАТСКАЯ ЧАСТЬ РОССИИ; Yakutia; Siberia
• Online Access: http://cyberleninka.ru/article/n/tipy-zhiznennyh-form-astragalov-sektsii-xiphidium-bunge-i-ih-znachenie-dlya-sistematiki-roda; http://cyberleninka.ru/article_covers/13989323.png

Исследованы особенности жизненных форм астрагалов секции Xiphidium Bunge, произрастающих на территории Азиатской части России. Большинствовидов секции Xiphidium представлены полукустарничками (7 видов и 1 подвид), несколько меньше травянистыми растениями (5 видов) и кустарниками (3 вида). У травянистых форм прослеживается тенденция перехода от травянистого типа к полутравянистому. На основе структурного анализа надземных и подземных побегов все изученные виды разделены на 4 габитуальные группы. Wide distribution of separate representatives of the section Xiphidium Bunge in the area of North Asia and the diversity of habitat conditions encouraged the appearance and formation of a variety of vegetative and reproductive structures. However, no special research in morphology of most Astragalus L. species of the section Xiphidium has been conducted up to now. Peculiarities of life forms of 16 Astragalus taxa growing in Asian Russia were studied. According to I.G. Serebryakovs classification of life forms most of species of the section Xiphidium are represented by dwarf semishrubs (7 species and 1 subspecies), smaller number of herbaceous plants (5 species) and shrubs (3 species). Dwarf semishrubs prefer open habitats with high insolation and dryness of soil substrate. A. austrouralensis Kulikov, A. ceratoides Bieb., A. compressus Ledeb., A. macroceras C. A. Meyer, A. macropus Bunge, A. pseudomacropus Knjasev et Kulikov and A. stenoceras C.A. Meyer belong to them. Herbaceous perennial plants are limited in the composition of life forms and only represented by caudex ecomorph. In some herbaceous forms the trend is to pass to semiherbaceous type. Their dissimilarity from semiarborescent ones (semishrubs and dwarf semishrubs) is that they have annual lignified monocarpic overeground shoots. A. angarensis Turcs. ex Bunge and A. palibinii Polozhij belong to such species. Considerable distinctions of morphological structure may be observed in widespread species in different parts of their ranges in connection with the habitat conditions. A. cornutus Pallas and A. arbuscula Pallas are shrubs in the northern part of their area and in the southern one where they grow on poor subsalsuginous soils in meadow-steppe phytocoenoses they are represented by lower shrubs. Life form of A. suffruticosus DC. with a wide area (from southern regions of West and Middle Siberia to Central Yakutia) may change from dwarf shrub to shrub.