Net production rates and fruiting strategies of Alnus pendula and A. sieboldiana stands with special reference of pollen production

赤杨和西博尔迪亚纳林的净产率和结果策略，特别是花粉生产

• 批准号: 61560177
• 负责人: SAITO Hideki
• 金额: $ 1.09万
• 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: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61560177/
• 关键词: Net production rate; Pollen; Fruiting strategy; Sexual reproduction; Distribution of dry matter production; 先駆樹種; 肥料木; 乾物生産の配分; 再生産; ヒメヤシャブシ; オオバヤシャブシ; 現存量

Net production rates and number sequences of each component of the reproductive organ in steps between flower bud differentiation and seed dispersal were studied in two young stands of Alnus sieboldiana (S stand) and A. pendula (P stand), pioneer in xeric succession and with capability of nitrogen fixation. Above-ground net production rates were 2,100 g/M^2・yr in 1987 and 1988 for the S stand, and 1,200 g/M^2. yr in average between both the years for the P. Leaf biomass of the S was arrived at the peak after canopy closing, which raised the net production. Both the production rates in the S and P on a detrius lack in organic soils are considerably greater than that of deciduous forests on organic soils, and equal to that of Sugi and evergreen broadleaf ones. The production rates of the reproductive parts including pollen were 50 - 130 g/M^2・yr, in which seeds occupied only 10 %. The low distribution of seeds among dry-matter production of the repoductive components is profitable for the repoductive strategy of pioneer. No remarkable yearly changes during 1986 - 1988 were recognized in the number sequences in the S and P, which can be affected by small yearly ones of seeds production. The number of pollen grains neccessary for the formation of a seed was 500,000 in the S, and 200,000 in the P. In the young S stand, total female strobiles of 70 - 80% were fallen before ripe. In the mature P stand, fruit abscission percentages in 1986 and 1988 were 10%, while in 1987 that was as high as 45% due to the spell of rainy weather in flowering period.

以具有固氮能力的干性演替先驱桤木（S林）和山竹桤木（P林）幼林为研究对象，研究了在花芽分化和种子传播过程中各生殖器官各组成部分的净产量和数量序列。1987年和1988年S林的地上净产量为2100 g/M^2·年，1200 g/M^2。两年间的平均年生物量在冠层关闭后达到峰值，使净产量提高。有机土壤中磷和硫在缺磷条件下的产生率均显著高于有机土壤中的落叶林，与杉木阔叶林和常绿阔叶林相当。含花粉生殖部分的产出率为50 ~ 130 g/M^2·yr，其中种子仅占10%。种子在繁殖组分干物质生产中的低分布有利于先驱者的繁殖策略。1986 - 1988年，S和P的数量序列年际变化不显著，这可能受到种子产量年际变化较小的影响。形成一粒种子所需的花粉粒数，S林为50万粒，p林为20万粒。在S林幼林中，70 ~ 80%的雌花在成熟前就脱落了。1986年和1988年成熟P林分果实脱落率为10%，1987年由于花期多雨天气，果实脱落率高达45%。

项目成果

TSUTSUMI Naoki: "Production rates of each component of reproductive organ in young Alnus japonica stands" Trans. 99th Mtg. Jan. For. Soc.375-377 (1988)

TSUTSUMI Naoki：“赤杨幼林中生殖器官各组成部分的生产率” Trans。

齋藤秀樹: 日林誌.

斋藤英树：日轮师。

斎藤秀樹: 日林誌.

斋藤英树：日轮师。

筒泉直樹: 99回日林論. 375-377 (1988)

筒泉直树：第 99 届日本论论 375-377 (1988)

SAITO Hideki: "Above-ground net production rates with special reference of pollen production in a young Alnus sieboldiana population" J. Jpn. For. Soc.(1989?)

SAITO Hideki：“地上净生产率，特别参考年轻的 Alnus sieboldiana 种群的花粉产量”J. Jpn。