Abstract

Acer negundo L., the invasive tree species of North American origin, is naturalizing in the floodplain forests of Orenburg oblast. Now A. negundo has created an extensive secondary range on the territory of Orenburg oblast and occupies an area of more than 20 000 ha. On the right and left sides of the Tok River in Krasnogvardeysky and Grachevsky districts in the northwest of Orenburg oblast, four test areas of 20 × 2000 m were laid, and inside each test area, 40 sample plots of 20 × 50 m were laid. Nine tree species were considered; the data of records were recalculated per 1 ha. In tree communities of the floodplain of the River Tok, an absolute dominance of A. negundo, which in abundance exceeded all other floodplain tree species (281.13 and 383.25 specimens/ha), was noted. The share of invasive species in the floodplain forests of this area on average was 66.39%. The performed calculation of natural renewal of woody vegetation showed the considerable superiority of undergrowth of A. negundo (130 833.50 and 178 831.50 specimens/ha). Naturalization of A. negundo in floodplains of Orenburg oblast influenced negatively the height, development, and renewal of local forest-forming species, leading to irreversible consequences of degeneration of the floodplain forests.

中文翻译：

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宏槭（Acer negundo L。）（科科）迁入奥伦堡州西北部的洪泛区森林

摘要

北美起源的入侵树种宏cer（Acer negundo L.）正在奥伦堡州的洪泛区森林中归化。现在，A。negundo在奥伦堡州的领土上创造了一个广泛的次生范围，占地超过2万公顷。在奥伦堡州西北部Krasnogvardeysky和Grachevsky区的托克河的右侧和左侧，放置了20×2000 m的四个测试区域，并在每个测试区域内放置了40×20×50 m的样地。考虑了九种树种；每1公顷重新计算一次记录数据。在托克河泛滥平原的树木群落中，绝对优势的A. negundo注意到该物种的数量超过了所有其他泛滥平原树种（281.13和383.25个标本/公顷）。该地区洪泛区森林中入侵物种的平均比例为66.39％。木本植被的自然更新的进行计算显示的林下的相当优势A.荆（130 833.50和178 831.50标本/公顷）。入籍A.荆在奥伦堡州洪泛区不利影响的高度，发展，和当地的森林形成种类的更新，导致漫滩森林退化造成不可逆转的后果。