Changes in pollen production rates in Hinoki stands by tree density, soil fertility and stand age.

扁柏花粉生产率的变化取决于树木密度、土壤肥力和林龄。

• 批准号: 05660173
• 负责人: SAITO Hideki
• 金额: $ 0.9万
• 依托单位: Kyoto Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660173/
• 关键词: Chamaecyparis obtusa; Pollen; Rates of production; Reproductive organs; Soil fertility; Thinning; Tree density

In several Chamaecyparis obtusa stands differing in tree density and soil conditions, annual production rates (by number and dry weight) of male flowers, seeds and cones were studied using litter traps, and the production rate of pollen was estimated. Based on these production rates in a productive year, dry matter necessary for producing a single seed (cost), the ratio of this cost to mean seed weight (specific cost) and the M/F and P/S ratios (numerical ratios of male to female flowers and pollen to seeds on a land-area basis, respectively) were obtained and compared with each other. Attention was focused mainly on the differences in seed production sysytem between various degrees of tree density and the lower and upper parts of a slope. High efficiency of seed production was recognized in stands of high tree density under the same soil conditions and on the upper parts of a slope or under poor soil conditions at the same relative tree density. As for the effects of stand age, no differences in cost or specific cost between stands 26 and 77 yr old were evident. However, M/F and P/S ratios and dry-matter production rates of seeds and cones were higher in the 26-yr-old stand. These results indicate a higher efficiency of seed production in the young stand than in the old stand. In an unproductive year, there were no trends in the production rates of male flowers in relation to tree density, soil conditions or stand age.

在几个树木密度和土壤条件不同的扁柏林中，使用枯枝落叶收集器研究了雄花、种子和球果的年生产率（按数量和干重），并估计了花粉的生产率。根据这些丰产年份的生产率，获得生产单粒种子所需的干物质（成本）、该成本与平均种子重量的比率（特定成本）以及M/F和P/S比率（分别以土地面积为基础的雄花与雌花以及花粉与种子的数量比率）并相互比较。人们的注意力主要集中在不同程度的树木密度以及斜坡下部和上部之间种子生产系统的差异。在相同土壤条件下和斜坡上部的高树木密度林中或在相同相对树木密度的贫瘠土壤条件下，种子生产效率高。至于林龄的影响，26 年和 77 年林龄之间的成本或具体成本没有明显差异。然而，26 年林的 M/F 和 P/S 比以及种子和球果的干物质生产率较高。这些结果表明，幼林的种子生产效率高于老林。在低产年份，雄花产量与树木密度、土壤条件或林龄的关系没有变化趋势。

项目成果

内舘光邦・齋藤秀樹: "ヒノキ林の生殖器官生産量および種子生産様式-立木密度および斜面下部と上部による違い-" 京都府立大学農学部演習林報告. 39(印刷中). (1995)

Mitsukuni Uchidate 和 Hideki Saito：“柏树林的生殖器官生产和种子生产模式 - 树木密度和上下坡度的差异 -”京都府立大学农业研究森林报告 39（出版中）。

UCHIDATE,M.& SAITO,H.: "Changes in pollen production rates in Hinoki stands by tree density, soil fertility and stand age" Bulletin of the Kyoto Prefectural University Forests 39. (in press). (1995)

内馆，M.

内舘光邦・齋藤秀樹: "ヒノキ林の生殖器官生産量および種子生産様式-立木密度および斜面下部と上部による違い" 京都府立大学農学部演習林報告. 39(印刷中). (1995)

Mitsukuni Uchidate 和 Hideki Saito：“柏树林中的生殖器官生产和种子生产模式 - 取决于树木密度和上下坡度的差异”京都府立大学农学院实验森林报告 39（出版中）。