農業生態系における景観の構造と生物学的制御
1Department of Agroecology, University of Goettingen, Waldweg 26, D-37073 Goettingen, Germany.
Science (New York, N.Y.)
|August 7, 1999
まとめ
景観の構造は,生物学的害虫駆除に大きく影響を与えます. 古い畑の縁や休耕地などの特徴を持つ複雑な景観は,天然の敵の有効性を高め,ラプス花粉虫のような害虫による作物の被害を軽減します.
科学分野:
- 農業昆虫学 農業昆虫学について
- 景観の生態学 景観の生態学
- 生物学的害虫駆除は,生物学的害虫駆除とされています.
背景:
- 伝統的な生物学的害虫駆除は,地元の自然敵集団に焦点を当てています.
- 自然の敵を支援する風景構造の役割は,ますます認識されています.
- 景観の影響を理解することは,農業における持続可能な害虫管理に不可欠です.
研究 の 目的:
- レイプの花粉虫 (Meligethes aeneus) の生物学的制御に対する景観構造の影響を調査する.
- 景観の特徴の異なる空間的なスケールが害虫の死亡率と作物被害に及ぼす影響を評価する.
- 景観の複雑さが寄生虫の発生率と油菜の収穫量にどのように影響するか調べる.
主な方法:
- フィールド実験は,様々な空間スケールで実施されました.
- この研究では,ラップの花粉虫 (Meligethes aeneus) を,油性ラップ (Brassica napus) のモデル害虫として使用した.
- 古い畑の縁や放牧の生息地などの景観要素が害虫集団や自然敵に与える影響を評価した.
主要な成果:
- 寄生性の増加による古い畑の縁のストライプの存在で花粉虫の死亡率の増加が観察されました.
- 隣接し,広大で古い地生息地は,甲虫の死亡率にさらに大きな肯定的な効果を示した.
- 構造的に複雑な景観は,単純な農業景観と比較して,より高い寄生虫の割合と作物の被害が低いことを示した.
結論:
- 景観の構造は,生物学的害虫駆除の有効性において重要な要因である.
- フィールドマージンやブレイクエリアなどの景観の特徴を保存し,統合することで,天然の害虫抑制を強化することができます.
- 景観の複雑性を促進することは,油菜の栽培における化学農薬への依存を減らすための実行可能な戦略です.
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