ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : 直播植林のための種子の保存と播種前処理

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概要

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• Direct planting of mature and immature seeds of the gray mangrove, Avicennia marina (Forsk.)Vierh, is an effective method for mangrove afforestation along the desert coastline of the United Arab Emirates.For afforestation under the severe weather and environmental conditions on this desert coast, a large number of seeds should be stored in good condition until the time of planting.However the optimum method for practical storage of mangrove seeds has not been examined.Generally, mangrove seeds cannot be stored for a long period due to their viviparous character.Gray mangrove seeds have a pericarp for floatation in seawater, and the pericarp also affords protection from dry conditions when the seeds reach the high tide line in the intertidal zone.This characteristic of the pericarp was utilized for seed stotage.Storage in direct sunlight or in a refrigerator is harmful to seeds bacause of irradiation and chilling.Therefore, an air-conditioned room with a constant temperature of 24-25℃ and moisture 48-55% humidity, or a corridor with an air temperature 31-34℃ and 70-80% humidity are suitable places for storing a large number of seeds in good condition.Fresh seeds with pericarp lose weight gradually during storinge, and able to remain viable until they lose 32% of their weight.Such seeds can be stored for 23 days in an air-conditioned room, or 18 days in a corridor.Fresh seeds without a pericarp can be stored 5 days in both places, but 20 days is the absolute storage limit after pericarp removal.The pericarp of all seeds should be removed before planting to inprove the germination rate and avoid flotation in seawater.After soaking for various periods in running or still seawater, the pericarp can be removed easily by handsfrom allseeds without damage to the cotyledons.Fresh seeds require 1-2 days in still seawater(32℃ and 40.5%), and 6 hours soaking is enough for removing the pericarp from seeds stored for 20 days.

• 2001-08-30

著者

• 玉栄 茂康

  (株)国際水産技術開発

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• ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : 潮間帯における適正な播種の地盤の高さと間隔
• ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : 直播植林における種子の耐塩性
• ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : 直播植林のための種子の保存と播種前処理
• ヒルギダマシ植林による砂漠沿岸緑化に関する研究 : ペルシャ湾沿岸におけるヒルギダマシ種子の生態

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