一平方公里的森林一天能“造”多少氧气，这和树叶数量是怎么算出来的？
How much oxygen does a square kilometer of forest make in a day, and how is it calculated from leaves?
可用“净初级生产力”估算：森林通过光合作用每固定1分子CO2约释放1分子O2。温带森林年固碳约数吨/公顷，折算一平方公里阔叶林夏季一天可释氧数吨，具体取决于叶面积指数、光照和温度。
Use net primary productivity: photosynthesis releases roughly one O2 per CO2 fixed. Temperate forests fix several tonnes of carbon per hectare per year, so a square km of summer broadleaf forest can release tonnes of O2 daily—depending on leaf-area index, light and temperature.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#光合作用 #氧气 #叶面积
树木没有眼睛和大脑，怎么“知道”冬天快到了，就提前落叶、停止生长？
Trees have no eyes or brain—how do they “know” winter is coming and shed leaves early?
它们靠光周期：秋天白昼变短、夜变长，叶片里的光敏色素感知后，触发脱落酸等激素让叶柄形成离层、叶绿素回收、生长停止。这是写在基因里的季节程序。
They read photoperiod: shortening autumn days shift phytochromes, triggering hormones like abscisic acid that form an abscission layer, reclaim chlorophyll and halt growth—a seasonal program wired into genes.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#光周期 #落叶 #激素
一棵开花的树，是怎样把整座城市的蜜蜂、蝴蝶甚至鸟类连成一张“生命网”的？
How does one flowering tree link a city's bees, butterflies and even birds into a “web of life”?
树开花招来传粉昆虫，昆虫又吸引食虫鸟和蜘蛛；落花落果喂养地面动物和微生物；树洞给鸟和昆虫安家。一棵树就是许多物种的食堂、旅馆和车站。
Blossoms draw pollinators; pollinators attract insect-eating birds and spiders; fallen flowers and fruit feed ground animals and microbes; hollows house birds and insects. One tree is a cafeteria, hotel and station for many species.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#开花树 #传粉 #食物网
一棵大树的脚下，土壤里到底住着多少种我们看不见的小生物？
Beneath a big tree's roots, how many unseen tiny creatures actually live in the soil?
极多：一勺森林土壤里可能有上万种微生物（细菌、古菌、真菌），还有线虫、螨、跳虫、蚯蚓等无脊椎动物，它们分解枯枝落叶、循环养分，是整棵树的“地下食堂和清洁工”。
A huge number: a spoon of forest soil can hold tens of thousands of microbial species (bacteria, archaea, fungi) plus nematodes, mites, springtails, earthworms. They decompose litter and recycle nutrients—the tree's underground cafeteria and cleanup crew.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#土壤生物 #微生物 #分解
为什么说“一棵树就是一个小生态系统”，从树根到树冠都住着哪些“居民”？
Why say “one tree is a small ecosystem”—who lives from its roots to its crown?
树根连着真菌、线虫和蚯蚓；树干住着昆虫、真菌和鸟类；枝叶供养毛虫、蚜虫、传粉者和筑巢鸟；落叶养地表的微生物和小型动物。一棵树养活了上百种生命，是微观与宏观的枢纽。
Roots link fungi, nematodes and earthworms; the trunk houses insects, fungi and birds; leaves feed caterpillars, aphids, pollinators and nesting birds; litter feeds soil microbes and small animals. A single tree sustains hundreds of species—a hub of micro and macro life.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#树 #生态系统 #微观宏观