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Title :亜熱帯における島嶼型アグロフォレストリーシステムに関する研究
Title alternative :A study on islands type agroforestry systems in subtropics
Authors :平川, 守彦
Authors alternative :Hirakawa, Morihiko
Issue Date :Mar-2003
Abstract :平成13年度~平成14年度科学研究費補助金(基盤研究C(2))研究成果報告書
研究概要:「亜熱帯における島嶼型アグロフォレストリーシステムに関する研究」の一環として下記の通りの成果を得た。本研究の実験現場は,今なお,大戦時の不発弾が多数存在するため機械による造成はひじょうに危険である。そのため蹄耕法(不耕起造成)により野草地を利用している。しかし,自生する野草は放牧牛にとって嗜好性が悪く,また,栄養価や再生力も劣るため改善する必要がある。その改善策として,短草型牧草であるセントオーガスチングラス(St.Augustine grass)の導入を試みた。方法は,(1)過放牧後(草高約5cm)(2)火入れ後(3)裸地(地際除草)の区画に30×40cmのセントオーガスチングラス張芝を植え,積算優占度,草量の推移を調査した。その結果,セントオーガスチングラスの積算優占度は,火入れ区において常に70%を維持していたのに対して,裸地区・過放牧区においては低く,20%であった。乾物重は火入れ区,裸地区,過放牧区の順に多かった。火入れ区以外は雑草の占める割合が高かった。以上のことから,火入れ後に張芝を植える方法が,雑草の侵入を防ぎ,セントオーガスチングラスの生育に良い効果をもたらすことがわかった。今後はセントオーガスチングラスの生育を長期間調査し,その牧草の導入が野草地の造成を可能にすることができるかどうかを調べる必要がある。また,アヒルと食肉鶏を利用したウコン畑の雑草防除を比較行動学的に調べた結果,両家禽ともウコンより雑草を好んで採食するため除草作業の一役を担うことがわかった。しかし,アヒルでは休息行動が多くみられ,踏み倒し行動による雑草防除,一方,食肉鶏では,探査行動が多く,つつきによる防除が認められた。
要約(欧文):As the part of the research on islands type agroforestry systems in subtropics, it was possible to obtain the result along the following. The experiment station place of this research still, many unexploded bomb in World War II is scattered at present too, and therefore, it is very dangerous to establish grassland by big plough machine. This experiment station was developed by ploughless farming in the grassland in order to avoid this danger. The wild grass which grows there and naturally the preference is not good for grazing cattle, and it is necessary that they are improved in the low benefit in also comparing nutritive value and regrowth of the grass in the pasture. As the improvement, it was tried that St. Augustine grass of the short weed type pasture was introduced to this native pasture. Three introductions methods of St. Augustine grass for sodding are as follows. 1: sodding after over-grazing, 2: sodding after firing, 3: sodding after mowing on ground, were done in the native pasture. As the result, the value of St. Augustine grass SDR2 was about 20% in sodding after overgrazing and sodding after mowing on ground, while was always maintained 70% in firing method. The weight of St. Augustine grass was heavy in order of sodding after firing, sodding after mowing on ground, planting after overgrazing. The proportion which the weed occupied was high for the other sodding methods except for the sodding after firing. From the above fact, the method for sodding St. Augustine grass after the firing prevented the invasion of the weed well, and it was proven that the good effect was also brought about more and more for the growth of St. Augustine grass. The growth of Augustine grass will be investigated in future and in the long term, and it is necessary to examine whether that the introduction of the pasture enables the construction of the native pasture is possible. As the result of the research of the weed control of the curcuma field using the behavior of duck and chicken with part of agroforestry systems, it was proven that the weed was also liked from the curcuma in both. From this fact, that the role of herbicidal work in the curcuma field was done by also changing to the human in duck and chicken, both, cleared. However, it was mainly remarkably observed of the rest behavior than the duck in the curcuma field eating the weed, it was realized that the herbicidal behavior was the stamping down by webbed feet. But, it was indicated that here was the herbicidal ability than the duck, since the chicken comes in comparison with the duck with exploratory behavior, and since there are remarkably many actions.
未公開:P.4以降(別刷論文のため)
Type Local :研究報告書
Publisher :平川守彦
URI :http://hdl.handle.net/20.500.12000/13596
Appears in Collections:Research Report (Faculty of Agriculture)

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