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- Title
NEEDLE MORPHOLOGY RELATED TO CHEMICAL CONTENTS IN THE NEEDLES OF JAPANESE FIR (ABIES FIRMA) TREES SUBJECTED TO ACIDIC DEPOSITIONS AT MT. OYAMA, EASTERN JAPAN.
- Authors
Nakatani, Nobutake; Kume, Atsushi; Kobayashi, Tsuyoshi; Hirakawa, Tsuyoshi; Sakugawa, Hiroshi
- Abstract
Japanese fir (Abies firma) forests on the urban-facing side of Mt. Oyama, eastern Japan are frequently exposed to acidic depositions. These forests have been declining more severely than those on the mountain-facing side. Chlorophyll, N, Mg, K, Ca, P and Al contents were determined for current, one- and two-year-old needles collected from the crown surfaces of Japanese fir tree forming the forest canopy (ca. 30 m height) on both sides of Mt. Oyama. Needle dry mass per needle area on the urban-facing side was significantly smaller than that on the mountain-facing sides for each needle age class. This result suggests that the development of internal tissues of fir needles on the urban-facing side is defective. N and Chl contents per needle area on the urban-facing side were smaller than those on the mountain-facing sides, indicating that photosynthetic activity per needle area is suppressed in the needles from the urban-facing side. For each needle age class, both area- and mass-based Mg contents were smaller on the urban-facing side than on the mountain-facing side, but mass-based Al contents were greater on the urban-facing side. These results suggest that acidic depositions cause nutritional disorders, which, in turn, leads to decreased needle productivity in the fir trees on the urban-facing side.
- Subjects
ACID deposition; FORESTS &; forestry; POLLUTANTS; ALUMINUM; CHLOROPHYLL; NITROGEN; POLLUTION
- Publication
Water, Air & Soil Pollution, 2004, Vol 152, Issue 1-4, p97
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/B:WATE.0000015343.24509.19