生态系统中的物质循环
Matter Cycling in Ecosystems
构建一个模型，描述生态系统中物质在植物、动物、分解者和环境之间是如何流动的。
Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment in an ecosystem
学习证据 / Evidence
- 描述分解者（真菌、细菌、蚯蚓）在分解死亡物质中的作用
- 追踪物质的流动：植物利用土壤养分生长 → 动物吃植物 → 动物死亡 → 分解者将养分归还土壤
- 绘制或解读一个展示生态系统中物质循环的简单示意图
- Describe the role of decomposers (fungi, bacteria, worms) in breaking down dead matter
- Trace the movement of matter: plant grows using soil nutrients → animal eats plant → animal dies → decomposers return nutrients to soil
- Create or interpret a simple diagram showing matter cycling through an ecosystem
评估问题 / Assessment
{{name}}能解释森林地面上的一片落叶会发生什么吗——微小的生物如何将它分解，养分如何回到土壤中帮助新植物生长？
Can {{name}} explain what happens to a fallen leaf on the forest floor — how tiny organisms break it down and the nutrients go back into the soil to help new plants grow?