EFFECTS OF FOREST DYNAMICS ON THE LIFE HISTORY AND POPULATION DYNAMICS OF UNDERSTORY PLANTS

森林动态对林下植物生活史和种群动态的影响

• 批准号: 13640631
• 负责人: KACHI Naoki
• 金额: $ 0.58万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640631/
• 关键词: demography; gap-regenerating forest; life table response experiment; mega-matrix model; population growth rate; Pteridophyllum racemosum; subalpine perennial herb; wave-regenerating forest; 感受性分析; ギャップ更新; 縞枯れ更新; マトリックス・モデル; 林床植物; 固体群統計

1. The environments of forest understory vary during regeneration processes of individual canopy trees. Temporal changes in understory environments directly affect the life-history and population dynamics of understory herbaceous plants. To understand the life-history strategy of herbaceous plants under the dynamic forest regeneration processes, we investigated the effects of forest regeneration on the life-history and population dynamics of an understory plant population.2. Six plots with various light conditions were chosen for demography of an understory plants, Pteridophyllum racemosum, in two types of forest regeneration; gap-regeneration and wave-regeneration, on Mt Shimagare, Kita-Yatsugatake, Nagano Prefecture in central Japan. All Pteridophyllum racemosum plants in the plots were marked and the overwintering bud of individual rosettes were determined at the end of growing season each year. Newly recruited individuals originating from vegetative propagation were also marked and … More measured.3. Based on the demographic data, we constructed stage-specific transient matrix models and analyzed the effects of changes in population growth rates and life history on the population dynamics of the species. Populations in a gap-regenerating forest showed higher population growth rate than those in a wave-regenerating forest. In the gap-regenerating forest, the population growth rate was low in shaded condition under a closed canopy, while in the wave-regenerating forest the population growth rate was low at the high-light site of standing dead of canopy trees. Sensitivity analyses of mega-matrix models revealed that survivorship of juveniles and flowering plants and recruitment of seedlings most contributed to the maintenance of populations in the gap-regenerating forestry. Life-table response experiment (LTRE) were applied to the mega-matrices corresponding to the populations in the two types forests. Differences in the long-term population growth rates in respective forests were mainly caused by the differences in the light conditions and in the interaction effects of light environments and regeneration patterns. These factors influenced the population dynamics through the survivorship of juveniles and transition probabilities from juveniles to flowering plants. Less

1. 林冠树个体更新过程中林下环境发生变化。林下环境的时间变化直接影响林下草本植物的生活史和种群动态。为了了解森林动态更新过程中草本植物的生命史策略，我们研究了森林更新对林下植物种群生命史和种群动态的影响。2．选择了六块具有不同光照条件的地块，对两种类型的森林再生中的林下植物（蕨类植物）进行人口统计；日本中部长野县北八岳岛志贺山的间隙再生和波浪再生。对样地中的所有蕨类植物进行标记，并在每年生长季结束时确定单个莲座丛的越冬芽。来自营养繁殖的新招募的个体也被标记和……更多测量。3。基于人口统计数据，我们构建了特定阶段的瞬态矩阵模型，并分析了种群增长率和生活史的变化对物种种群动态的影响。间隙再生森林中的种群数量比波浪再生森林中的种群增长率更高。林隙更新林中，在树冠封闭的遮荫条件下，种群增长率较低；而在波浪更新林中，在树冠树木枯死的高光处，种群增长率较低。巨型矩阵模型的敏感性分析表明，幼树和开花植物的存活以及幼苗的补充对林隙再生林中种群的维持最有贡献。对两类森林种群对应的巨型矩阵进行了生命表响应实验（LTRE）。各森林长期种群增长率的差异主要是由于光照条件的差异以及光环境与更新模式的相互作用影响造成的。这些因素通过幼体的存活率和从幼体到开花植物的过渡概率影响种群动态。较少的

项目成果

Suzuki, R.O.: "Spatial and temporal variations in mortality of the biennial Lysimachia rubida : effects of intraspecific competition and environmental heterogeniety"Journal of Ecology. 91. 114-125 (2003)

Suzuki, R.O.：“两年生珍珠菜死亡率的时空变化：种内竞争和环境异质性的影响”生态学杂志。

Yatsu, Y., Kachi, N., Kudoh, H.: "Ecological distribution and phenology of an invasive species, Cardamine hirsuta L., and its native counter part, C.flexuosd with., in central Japan"Plant Species Biology. 18(in press). (2003)

Yatsu, Y.、Kachi, N.、Kudoh, H.：“日本中部入侵物种 Cardamine hirsuta L. 及其本地对应物种 C.flexuosd with. 的生态分布和物候学”植物物种生物学。

Ozawa, M., Kudoh, H., Kachi.N: "Breeding system of pteridophyllum racemosum Sieb et Zucc.(Papareraceae)"Plant Species Biology. 16. 237-239 (2001)

Ozawa, M.、Kudoh, H.、Kachi.N：“总状蕨类植物的育种系统 Sieb et Zucc.（Papareraceae）”植物物种生物学。