soil ecosystem的用法和樣例：
例句
- The abundance and availability of water and nutrients in a soil ecosystem determine its fertility.
土壤生態系統中水分和養分的丰度和有效性決定土壤的肥力。 - The interrelations between acid rain and soil ecosystem are analysed.Acid rain could change soil acidity, enhance soil toxicity, reduce soil active,destroy soil structure.
酸雨能改變土壤生態系統中土壤酸鹼性，增加土壤毒害，降低土壤活性，破壞土壤結構，同時土壤生態系統影響酸雨的形成和污染。
