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Chamaecyparis obusa中，在树木密度和土壤条件下不同，使用垃圾陷阱研究了雄花的年生产率（按数量和干重），种子和锥体研究了，估计了花粉的产量。基于这些生产年份的这些生产率，生产单个种子（成本）所需的干质，该成本与平均种子重量（特定成本）的比率和M/F和P/S比（分别以雌性花和花粉的数值比例（分别以土地为基础）的种子）获得，并获得了彼此的比较。注意力集中在各种树密度与坡度的下部和上部之间的种子产生Sysytem差异上。在相同的土壤条件下，在坡度的上部或在相同的相对树密度下的较差的土壤条件下，在高树密度的林分中识别出高效率的种子产量。至于看台年龄的影响，看台26至77岁之间的成本或特定成本没有明显的差异。然而，在26岁的林分中，种子和锥体的M/F和P/S比和干燥的生产速率更高。这些结果表明，年轻的林分中种子产量的效率高于旧林分。在一个非生产性的一年中，与树密度，土壤状况或年龄相关的雄花的产量没有趋势。

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）。

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）。

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.