上一片挖矿产，这一片看森林：同样是资源，森林是活的，会呼吸、会长大。Last leaf dug into minerals. This leaf meets a living resource — the forest, which breathes and grows.
第 1 步：三层楼的宝库Step 1: A three-floor treasure house
先跟蓝蓝走进雨林，看三层楼里住了谁。Follow Lanlan into the rainforest — who lives on each floor?
雨林像三层楼：乔木层大树撑伞，灌木层小树搭床，地被层苔藓铺毯。森林是三合一宝库：碳库吸碳，水库蓄水，生物家园住着大半物种。The rainforest is a three-floor house: canopy trees hold umbrellas, shrubs make beds, mosses carpet the floor. One forest, three vaults: a carbon bank, a water bank, and a home for most species.
这么多宝贝，人类从森林里拿走什么？With so much treasure, what do people take from forests?
第 2 步：绿色海洋的馈赠Step 2: Gifts from the green ocean
木头盖房做家具，纸浆造纸，药材里藏着新药。亚马逊像绿色海洋，一条大河养活一片林，还有刚果与东南亚雨林作伴。Wood builds homes and chairs, pulp becomes paper, medicines hide new cures. The Amazon is a green ocean — one great river feeding endless trees, joined by the Congo and Southeast Asian rainforests.
拿得太多，森林会怎么样？What happens when we take too much?
第 3 步：秃了会变沙漠Step 3: Bald forests turn to desert
过度砍伐让森林变秃，土地留不住水，慢慢变成沙漠。办法是少砍多种：种树补回绿肺，保护天然林不再砍。Over-cutting leaves forests bald: soil loses water and slowly becomes desert. The fix is cut less, plant more — new trees heal the lungs, protected old forests stay standing.
🎮 你来当护林员（40 秒）🎮 Your turn: keep the forest (40 seconds)
先拖采伐滑块，看 10 年后森林剩多少；再过 4 关，找到可持续采伐量。Drag the cut slider to see the forest in 10 years; then clear 4 forests by finding each sustainable cut.
一句话记住它：森林是地球的肺：吸碳、蓄水、养生物；砍秃会变沙漠，种树护林能补回。Remember it in one line: forests are Earth's lungs — storing carbon, holding water, housing life; bald forests become desert, planting and protecting heals them.
三合一宝库：碳库、水库、生物家园（三层楼）Three vaults in one: carbon bank, water bank, home of life (three floors)索取有度：木材纸药材都好，过度砍伐变荒漠Take with care: wood, paper and medicines are gifts — over-cutting makes desert可持续：年采伐 ≤ 年生长 + 年种植，保护天然林Sustainable: yearly cut ≤ yearly growth + planting; protect old forests
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
Back to tree
