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Study on functions of reed communities and their growth factors on lake shores.

湖岸芦苇群落功能及其生长因子研究.

基本信息

批准号：
09450199
负责人：
FUJII Shigeo
金额：
$ 3.26万
依托单位：
KYOTO UNIVERSITY (1998-1999)Ritsumeikan University (1997)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

A series of field surveys on reed growth were conducted at the test plantation site located on a Lake Biwa shore near the Hayama River mouth. Reeds were transplanted in more than one thousand test lots on the late October 1997. Each lot had different attributions on plantation methods, grand level, reed density and distance from the shoreline. Observations of reed growth were conducted every month during the next two years, and the following conclusions were drawn from analysis of observation results : (1) Out of 1081 test reed lots planted in 1997, 449 lots failed to grow, which were mainly planted with the Bittmann Method and the Root Method, while the other methods produced 89% in survival ratio, especially high percentage (98%) in the Mat Method. (2) Average density of reed in the autumn is 86.6, 67.8, 65.3 and 20.6 stalks/mィイD12ィエD1, respectively for the Mat Method, the Pot Method, the Sandbag Method and the Big Stump Method. (3) The erosion exceeding 12 cm depth had adverse effects on reed growth, while the erosion less than 4 cm did not make any difference abstraction on reed growth apparently. (4) All of the factors (transplantation methods, sites, dates and any of their combinations) are statistically proved to have some significant influence on the reed growth variation with a risk less than 0.1%. The contribution of transplantation method on reed growth was 20% of the whole variation.

在早山河入海口附近琵琶湖岸边的试验场进行了一系列关于芦苇生长的实地调查。1997年10月下旬，在1000多个试验田中进行了芦苇移植。各地块在种植方式、郁闭度、芦苇密度、距海岸线距离等方面具有不同的属性。在接下来的两年里，每个月都对芦苇的生长进行观测，通过对观测结果的分析，得出以下结论：(1)1997年种植的1081个试验地中，有449个试验地没有生长，主要采用Bittmann法和Root法，而其他方法的成活率为89%，特别是Mat法的成活率较高(98%)。(2)草席法、盆栽法、沙袋法和大树桩法的秋季平均密度分别为86.6、67.8、65.3和2 0.6枝/mィイD12ィエD 1。(3)侵蚀深度大于12 cm对芦苇生长有不利影响，小于4 cm的侵蚀对芦苇生长无明显影响。(4)各因素(移栽方式、移栽地点、移栽日期及其组合)对芦苇生长变异均有显著影响，风险均小于0.1%。移栽方式对芦苇生长的贡献率为20%。