Changes in pollen production rates in Sugi stands with increasing stand age and soil fertility.

杉树花粉生产率随着林龄和土壤肥力的增加而变化。

• 批准号: 02660162
• 负责人: SAITO Hideki
• 金额: $ 1.47万
• 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: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02660162/
• 关键词: Air-borne pollen; Cryptomeria japonica; Male flowers; Pollen; Pollen disease; Rates of production; Reproductivity; 雄花生産量; 年齢系列; 凶作; 花粉形成; スギ林; 年齢系例

The current increase of air-borne pollen from Sugi (Cryptomeria japonica D.Don) forest plantations, which were expanded through the policy of expensive afforestation after World War II, has contributed to the spread of Sugi pollen disease since 1975. Therefore, we studied changes in pollen (male flower) production of Sugi stands with ageing. Production rates of male flowers in a stand were measured by the litter trap method. The study stands were 11 plantations ranging in age from 12 to 90 yr and having mutual site conditions, and a stand about 600 yr old in the ground of a Buddhist temple. In the productive year 1991, the relationship between the number of open male flowers in a stand and stand age showed a ceiling curve, indicating a constant upper limit for several hundred years after the age of 50 yr. No difference in flower number was recognized among stands over 40 yr old because of the variation among the stands. On the other hand, in the unproductive year 1992, the numbers of flowers decreased to about 1% of that in the previous productive year, and did not vary among stands. The above results also indicate that an increase of pollen dispersal per unit land area is improbable if the final cutting age of Sugi plantations is increased to as much as 120-150 yr. Many closed male flowers fell before opening. In the ancient stand about 600 yr old, most flowers that fell after December at the end of pollen formation had aborted pollen sacs. However, in the other stands less than 90 yr old, most flowers had sound pollen sacs and pollen grains. The fall in the former stand was due to physiological causes, and that in the latter, to physical forces such as strong wind and snow-fall in winter.

Sugi（Cryptomeria japonica D.Don）森林种植园的空气传播花粉目前的增加，这些人工林通过第二次世界大战后的昂贵造林政策扩大，自1975年以来就促成了Sugi花粉疾病的蔓延。通过垃圾陷阱法测量了雄性花的产量。这项研究表现出来的是11个种植园，年龄从12岁到90岁，有相互的现场状况，在佛教寺庙的地面上约有600年的时间。在1991年生产的一年中，架子和摊位年龄的开放式雄花数量之间的关系显示出天花板曲线，表明50岁以后几百年的上限恒定。由于看台之间的变化，由于40岁以上的摊位之间的花数没有差异。另一方面，在1992年非生产性的一年中，花的数量在上一年的生产年份减少到约1％，而在看台之间没有变化。以上结果还表明，如果Sugi人工林的最终切割年龄增加到多达120 - 150年，则每单位土地面积的花粉扩散增加是不可能的。开放前，许多封闭的雄花掉了。在古老的看台约600岁，大多数在花粉形成结束后倒下的花朵都流产了花粉囊。但是，在其他摊位不到90岁，大多数花朵都有声音花粉和花粉颗粒。前架子的跌倒是由于生理原因，后者是由于冬季强风和雪落的物理力量。

项目成果

内舘 光邦・齋藤 秀樹・竹岡 政治: "林齢の増加に伴うスギ林花粉生産量の変化" 日本林学会関西支部論文集. 1. 215-218 (1992)

Mitsukuni Uchidate、Hideki Saito、Seiji Takeoka：“由于森林年龄增加而导致雪松林花粉产生的变化”日本林业学会关西分会论文集 1. 215-218 (1992)。

内舘 光邦,齋藤 秀樹,竹岡 政治: "林齢の増加に伴うスギ林花粉生産量の変化" 日本林学会関西支部大会発表論文集. 1. (1992)

Mitsukuni Uchidate、Hideki Saito、Seiji Takeoka：“林龄增加导致雪松林花粉产生的变化”日本林学会关西分会会议记录 1。（1992 年）。