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第七届世界草莓大会

作者： K.Kawagishi A.Kawaguchi Y.Kakizaki M.Goto Donan Agricultural Experiment Station Hokkaido Research Organization furano branch Kamikawa Agricultural Extension Center Iburi Agricultural Extension Center

In Hokkaido,strawberry harvest time is mainly in spring,and the winter is *** is a traditional strawberry culture but this has decreased very much in the other regions of *** the 1990 s,summer-autumn harvest culture using everbearing strawberries was introduced to Hokkaido because the climate is cool in *** culture was also introduced in the early 2000 s because the market required local strawberry supply during the *** the Toyoura area,the strawberries have been produced and shipped between late April and early July by spring harvest culture,from late June to mid-November by summer-autumn harvest culture with everbearers,and from mid-October to late July by forced *** 25%of the production volume is by the spring harvest culture,10%is by the summer-autumn harvest culture,and the remainder is by the forced *** the Frano area,the strawberry farmers have also harvested and shipped throughout the year by using summer-autumn harvest culture from early June to mid-November,and by forced culture from early November to early *** the production volume,the percentage of summer-autumn harvest culture is about 60%and the forced culture is 40%.The major cultivars used in the forced culture are ’Sagahonoka’ and’Tochiotome’ which were bred in the warmer region of Japan and have a short dormant *** the other hand,the cultivar for the spring harvest culture is’ Kentaro’,which was released in Hokkaido and has a relatively long dormant *** does not have a very large share of the Japanese strawberry market but it is one of the few regions to harvest strawberries throughout the *** is because the farmers can grow the berries by the combination of spring harvest culture,summer-autumn harvest culture with everbearers and forced culture.

关键词： everbearing strawberry forced culture spring harvest summer-autumn harvest

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Effects of silviculture treatments in a hurricane-damaged forest on carbon storage and emissions in central Hokkaido, Japan

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Journal of Forestry Research 2011年第1期22卷 13-20页

作者： Toshiaki Owari Naoto Kamata Takeshi Tange Mikio Kaji Akio Shimomura Hokkaido Forest Graduate School of Agricultural and Life Sciences The University of Tokyo 2 jo Kita 1 Yamabe Furano Hokkaido 079-1561 Japan Chichibu Forest Graduate School of Agricultural and Life Sciences The University of Tokyo 1-1-49 Hinoda Chichibu Saitama 368-0034 Japan Department of Forest Science Graduate School of Agricultural and Life Sciences The University of Tokyo 1-1-1 Yayoi Bunkyo Tokyo 113-8657 Japan

Hurricanes cause abrupt carbon reduction in forests, but silviculture treatment can be an effective means of quickly regenerating and restoring hurricane-damaged sites. This study assessed how silviculture treatments affect carbon balance after hurricane damage in central Hokkaido, Japan. We examined carbon storage in trees and underground vegetation as well as carbon emissions from silviculture operations in 25-year-old stands, where scarification and plantation occurred just after hurricane damage. The amount of carbon stored varied according to silviculture treatment. Among three scarification treatments, a scarified depth of 0 cm （understory vegetation removal） led to the largest amount of carbon stored （64.7 t·ha^-1 C）. Among four plantation treatments, the largest amount of carbon was stored in a Larix hybrid （L. gmelinii var. japonica × L. kaempferi） plantation （80.3 t·ha^-1 C）. The plantation of Abies sachalinensis was not successful at accumulating carbon （40.5·ha^-1 C）. The amount of carbon emitted from silviculture operations was 0.05-0.14 t·ha^-1 C, and it marginally affected the net carbon balance of the silviculture project. Results indicate that silviculture treatments should beperformed in an appropriate way to effectively recover the ability of carbon sequestration in hurricane-damaged forests.

关键词： carbon emission carbon storage forest restoration hurricane damage plantation scarification

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