Life Stages and Demography of Invasive Shrub Cytisus scoparius (Fabaceae) in Lithuania

IF 0.4 4区生物学 Q4 PLANT SCIENCES

GAYANA BOTANICA Pub Date : 2020-06-01 DOI:10.2478/botlit-2020-0001

Laurynas Taura, Z. Gudžinskas

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引用次数: 2

Abstract

Abstract Alien invasive woody plant species, particularly those associated with nitrogen-fixing bacteria, are of special concern, because they may cause drastic changes in entire ecosystems. Although most of invasive species of Lithuania originate from other continents, one of these, Cytisus scoparius, is native to Europe. Fast spread of this species in Lithuania and its invasion to forest, coastal and continental sand, occasionally grassland habitats, stimulated us to study demographic structure of its populations. The aim of this research was to evaluate density, life stage and age structure of the populations, and to analyse relationships of the age of individuals with their life stages, height and stem diameter. Five populations were studied in the western, southern and eastern parts of Lithuania in July–August 2017. For the study, we selected stands of this species occupying at least 0.1 ha in a uniform habitat. We applied sampling plot method, and studied at least 100 individuals in each population, excluding seedlings. The age, life stage, height and stem diameter of 583 individuals were studied. The average density of individuals ranged between 5.15 individuals/m2 and 15.40 individuals/m2. Juvenile individuals reach the stage of vegetative adults on the second or third growth season, occasionally on the third year they reach even the stage of generative adults. The average age of juveniles was 1.10 years, of vegetative adults it was 2.99 years and 6.26 years of generative adults. The oldest generative individual was 28 years old. Linear regression analysis of the relationship between the plant age and the stem diameter revealed that the age predetermined the stem diameter variance by 81.0% in the studied populations. This study revealed that densities of C. scoparius individuals of all life stages in disturbed and undisturbed habitats were sufficient to sustain longevity and further expansion of populations. Therefore, appropriate measures for control and eradication of this species should be applied, particularly in the habitats of high conservation value.

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立陶宛入侵灌木菖蒲(豆科)的生命阶段和人口统计学

外来入侵木本植物物种，特别是与固氮细菌相关的木本植物物种，可能会引起整个生态系统的剧烈变化，因此受到人们的特别关注。虽然立陶宛的大多数入侵物种都来自其他大陆，但其中一种，猪毛Cytisus scoparius，是欧洲本土的。该物种在立陶宛的快速传播及其对森林、沿海和大陆沙地的入侵，偶尔还有草原栖息地，促使我们研究其种群的人口结构。本研究的目的是评估种群的密度、生命阶段和年龄结构，并分析个体年龄与其生命阶段、高度和茎粗的关系。2017年7月至8月在立陶宛西部、南部和东部对五个种群进行了研究。在本研究中，我们选择了在均匀生境中至少占地0.1 ha的林分。我们采用样地法，在每个种群中至少研究了100个个体，不包括幼苗。对583个个体的年龄、生活阶段、高度和茎粗进行了研究。平均密度在5.15 ~ 15.40只/m2之间。幼虫在第二或第三个生长季节达到营养成虫阶段，有时在第三年甚至达到生殖成虫阶段。青虫平均年龄1.10岁，营养成虫平均年龄2.99岁，生殖成虫平均年龄6.26岁。最年长的生育个体是28岁。对株龄与茎粗之间的关系进行线性回归分析，结果表明，在研究群体中，株龄决定了81.0%的茎粗方差。研究表明，在受干扰和未受干扰的生境中，东莨菪各生命阶段的个体密度都足以维持种群的寿命和进一步扩张。因此，应采取适当措施控制和消灭这一物种，特别是在具有高度保护价值的生境中。

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来源期刊

GAYANA BOTANICA Agricultural and Biological Sciences-Plant Science

CiteScore

0.70

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal welcomes works carried out by scientists of all nationalities, and may be written in either English or Spanish. The journal receives works in systematic, taxonomy, floristic, ecology, physiology, morphology, development, conservation, cytology and phytochemical botany.