CAJ | 학술논문

珙桐(Davidia involucrate) 为中国一级保护植物,系第三纪古热带植物的孑遗树种,属于珍稀濒危的单属单种植物.近年来,由于区域开发项目的增多,致使这种古老而珍稀树种的天然分布生境和天然种群数量急剧下降.为此,本文通过大面积的野外调查和查阅资料,研究了珙桐的生物和生态特性,系统分析了珙桐在不同地质阶段的地理分布状况,探讨了促使其种群数量动态变化的主要原因.不同年份标准样地调查表明,在没有人类干扰的区域,珙桐种群数量随年份增加;但是在有人类干扰的区域,珙桐种群数量随年份减少;随着人口密度和人类活动的增加,珙桐种群数量呈对数曲线y＝-100.7ln(x)+178.09的速度下降,这表明珙桐种群已由优势种群衰退到濒临灭绝的程度.基于对珙桐的现有研究,提出了珙桐的保护措施.图3参31.
공동(Davidia involucrate) 위중국일급보호식물,계제삼기고열대식물적혈유수충,속우진희빈위적단속단충식물.근년래,유우구역개발항목적증다,치사저충고로이진희수충적천연분포생경화천연충군수량급극하강.위차,본문통과대면적적야외조사화사열자료,연구료공동적생물화생태특성,계통분석료공동재불동지질계단적지리분포상황,탐토료촉사기충군수량동태변화적주요원인.불동년빈표준양지조사표명,재몰유인류간우적구역,공동충군수량수년빈증가;단시재유인류간우적구역,공동충군수량수년빈감소;수착인구밀도화인류활동적증가,공동충군수량정대수곡선y＝-100.7ln(x)+178.09적속도하강,저표명공동충군이유우세충군쇠퇴도빈림멸절적정도.기우대공동적현유연구,제출료공동적보호조시.도3삼31.
Dovetree (Davidia involucrate), one of the first-class protective plants in China, is a relic species of paleotropical kingdom in Tertiary period, belonging to Davidiaceae with a single genus. In recent years, the increase of regional developing projects has led to a sharp decrease of this ancient and rare plant in naturally distributed habitats and natural population. In this paper, the biological and ecological characteristics of Dovetree were described, and the geographically distributed condition of this species in different geologic periods as well as the major reasons for dynamic changes of its population were systematically analyzed in accordance with field researches and References. The investigations conducted in different years by setting up standard sample plots showed that the population number of Dovetree increased yearly in the areas without human interference but decreased yearly in the areas with human interference. With the increase of population density and human activities decreased as the logarithmic curve: Y = -100.7ln(x)+178.09, and it has turned from a dominant population into an endangered population. Based on the former and present studies on Dovetree, some protection strategies were put foreword for protecting this ancient and rare species.