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Effects of air pollution on the tree growth and vigor on the Japan Sea coast-a dendrochronological study-

空气污染对日本海沿岸树木生长和活力的影响——树木年代学研究——

基本信息

批准号：
07308065
负责人：
KAWANO Shoichi
金额：
$ 2.43万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

1.The effects of low level air pollution on various tree elements, including Cryptomeria japonica (Japanese Cedar), Pinus densiflora, Pinus thunbergii, and numerous other broad-leaved evergreen as well as deciduous trees, have been studied in the surrounding area of two thermoelectric power stations in Sakai-gun, Fukui Prefecture, on the Japan Sea side of central Honshu, Japan. The monitoring on the degree of visual injury of tree species in the whole area has been cotinued for 23 years since 1974, and in the present report the results of the field survey on the visual injury during 1995 and 1996 are compiled. There are no trees at present without any visual injury in this area, reflecting effects of air pollution. Morphological and phyiological symptoms were also examined.2.A dendrochronological study was also carried out to evaluate the effects of air pollution on the increment growth of Japanese Cedars. Conspicuous correlations between the levels of air pollution and decline in tree ring growth were recognized. The growth inhibition was also revealed by the tree ring analysis.3.Pine forests consisting of Pinus densiflora and P.thunbergii have been devastated by pine wilt disease for past 40 years in the large areas, especially in the southwestern part of Japan. In the present study we have examined radial growth of pine trees which were killed by pine wilt to elucidate how environmental stresses such as air pollution and/or acid deposition affect the disease in its development. Aged trees, about 100 years old or more, show reduction in radial growth in accordance with SOx increase in the air. However, such trees, even though survived under the stress, were abruptly killed when their growth recovered.

1.在日本本州中部日本海一侧的福井县Sakai-gun的两个热电厂周围地区，研究了低水平空气污染对各种树木元素的影响，包括柳杉（日本雪松）、赤松、黑松和许多其他阔叶万年青和落叶树木。自1974年以来，连续23年对全区树种的视觉伤害程度进行了监测，本文报道了1995年和1996年的实地调查结果。现时该区没有一棵树木是不会对视觉造成伤害的，反映空气污染的影响。2.采用年轮学方法研究了大气污染对柳杉生长的影响。人们认识到，空气污染程度与树木年轮增长下降之间存在明显的相关性。树木年轮分析也揭示了生长抑制。3.近40年来，赤松和黑松的松林在大面积地区，特别是在日本西南部，遭受了松树枯萎病的严重危害。在本研究中，我们已经研究了松树的径向生长被杀死的松树枯萎病，以阐明如何环境压力，如空气污染和/或酸沉降影响疾病的发展。树龄约100年或更长的老树，随着空气中SOx的增加，径向生长减少。然而，这种树木，即使在压力下生存，当它们的生长恢复时，也会突然死亡。