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肥沃な放牧は,植物や土壌のネマトードの群れの支配度を増加させる

Rui Dong¹, Shijie Lv², Changlin Xue¹

¹Department of Ecology School of Life Science and Technology, Inner Mongolia Normal University Hohhot Inner Mongolia Autonomous Region China.

Ecology and evolution

|September 3, 2025

まとめ

砂漠の草原では植物や土壌のナマトードの多様性が著しく減少します草原の持続可能性と生物多様性の保全には適度な牧草の維持が不可欠です

科学分野:

エコロジー
環境科学
動物学

背景:

草原の生態系には草食動物が牧草することが不可欠です
砂漠の草原の植物と土壌の糸虫の多様性に対する放牧の強度の影響は完全に理解されていません.

研究の目的:

砂漠の草原の植物と土壌のナマトード多様性に対する牧草の強さの違いを評価する.
植物多様性と土壌ネマトード多様性の関係を調査する.
特定の植物-ネマトード相互作用を特定する.

主な方法:

5つの牧草の強度が調査された. 牧草なし (CK),軽牧草 (LG),中等牧草 (MG),重牧草 (HG),極重牧草 (EG).
Sobs,Shannon-Wiener,Inverse Simpson,Heipなどの指標を用いて植物多様性を定量化した.
同じインデックスを用いて土壌の糸虫の多様性を評価し,植物と糸虫の共同体を関連付けるための相関分析を行った.

主要な成果:

密度の高い牧草 (HG) は,最も低い植物と糸虫の多様性をもたらし,対照群 (CK) よりも著しく低い.
植物多様性指数は,CKと比較して,HGでは23.78%と47.43%と,ネマトード多様性指数は22.2%と50.9%減少した.
植物とネマトドの多様性が有意に正の相関関係にあることが判明し,この相関関係がシネージ的であることを示唆した. *Cleistogenes songorica* と *Stipa breviflora* のような特定の植物は,草食性ネマトード (*Paratylenchus*) と, *Convolvulus ammannii* は *Acrobeloides* と関連していた.

結論:

荒野の草原の生物多様性や持続可能な開発に悪い影響を与えている.
特定の植物種は,土壌のネマトードコミュニティの構造に規制的な役割を果たします.
草原の効率的な管理のために,軽度 (LG) または中度 (MG) の牧草の強さを維持することが推奨されます.

キーワード:

砂漠の草原牧草の強度ネマトードコミュニティ植物界 αの多様性

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