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Studies on the seed production of a hinoki chamaecyparis obtusa stand 7. in a 40 year old plantation



Studies on the seed production of a hinoki chamaecyparis obtusa stand 7. in a 40 year old plantation



Bulletin of the Ehime University Forest (20): 71-84



The seed production of a 40-yr-old C. obtusa C. et Z stand was studied in 1982 at the Ehime University Forest [Japan]. About 68% of the total cones produced in the experimental area were produced in the upper 3 layers, except for the top. Most of the cones produced in the area (63%) came from only 3 of 13 trees in the area. The quality of the seeds varied from tree to tree. Within a tree, at the part of treehead that was favored with the chance of fertilization, these cones were affected by seed-parasites. The seed quality was relatively stable at the middle layers. With regard to sound seed productivity, even the tree which produced about 1/3 of the total cones in the 100m2 area produced less than 10% of the total sound seeds, while it yielded 40% of the total damaged seeds in the area. When the damage of seed-parasites was slight, the tree which produced only 7.2% of the total cones was found to produce 18.6% of the total sound seeds. Only two trees produced over 10% each of the sound seeds, together producing about 44%. Seed productivity in the hinoki stand concentrated in a few trees. Megastigmus chamaecyparidis Kamijo was the primary parasite. Hyperparasitoids were found in this area. It may be necessary to investigate the mode of life of both parasites in order to produce superior seeds in a hinoki stand.

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Accession: 006521656

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