Physiological ecology of Polygonum cuspidatum at timberlin on Mt. Fuji.

富士山林林虎杖的生理生态学。

• 批准号: 02640505
• 负责人: MASUZAWA Takehiro
• 金额: $ 1.22万
• 依托单位: Shizuoka 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 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640505/
• 关键词: Timberline of Mt. Fuji; Doughnut phenomenon; Succession; Alpine plants; photosynthesis; 光合成速度; アレロパシ-; 森林限界; 光合成

The plant community in the vicinity of the timberline of Mt. Fuji is not in a stable climax stage. On the southeast side, bare land and communities of perennial herbaceous plants are widely distributed over an area extending downward from the vicinity of the Hoei Crater. In such situations, herbaceous perennial communities play an important role in the process of succession to a woody plant community. That is, in almost all cases on Mt. Fuji, the transfer from alpine grassland to forest starts with the invasion of woody plants into patches of P. cuspidatum and P. weyrichii. Therefore, it is assumed that these Polygonum patches offer an "place "in a process where by woody plants can established.The respiration rate of the rhizomes at the central part of a P. cuspidatum patch was measured to find the relationship between rhizome activity and the low biomass of its central part. Respiration rates of about 1.3mg CO_2 at the peripheral part, and of about 0.5mg CO_2/g/h at the central part were obtained in August on large patch. There was similar tendency observed in September for the respiration of the rhizome in the peripheral part to be higher than in the central part.Patch growth of harbaceous perennials has been studied with regard to Phragmites communis, Phragmites australis and Pteridium aquilinum. However, there have been no ecophysiological studies on patch structure according to patch size, especially on the activity of rhizome and soil development in the patch. In the present study it was found that the activity of the central part is lower than that of periphery. Although the cause remains to be clearly established, this is thought to result from the crowding and aging of the underground organ of the central part, which may cause the central biomass above ground to wither, and as a result, a doughnut phenomenon is brought about.

富士山林线附近的植物群落尚未处于稳定的高潮阶段。在东南侧，从宝永火山口附近向下延伸的区域广泛分布着裸地和多年生草本植物群落。在这种情况下，多年生草本群落在木本植物群落的演替过程中发挥着重要作用。也就是说，在富士山上，几乎所有情况下，从高山草原到森林的转变都是从木本植物入侵虎杖和威氏虎杖开始的。因此，可以认为这些蓼斑块在木本植物生长的过程中提供了一个“场所”。测量了虎杖斑块中心部分根茎的呼吸速率，以找出根茎活性与根茎呼吸速率之间的关系。其中心部分的生物量较低。 8月大斑块呼吸速率外围部分约为1.3mg CO_2，中心部分约为0.5mg CO_2/g/h。 9月份观察到类似的趋势，外围部分根茎的呼吸作用高于中心部分。对芦苇、澳大利亚芦苇和蕨菜等哈本多年生植物的斑块生长进行了研究。然而，目前还没有根据斑块大小对斑块结构进行生态生理学研究，特别是对斑块中根茎的活性和土壤发育的研究。在本研究中发现，中心部分的活性低于外围部分的活性。虽然原因尚不清楚，但一般认为是由于中央地下器官的拥挤和老化，可能导致中央地上生物量枯萎，从而产生“甜甜圈”现象。 。