One creek above Shimen Reservoir. One day of hands, roots, soil and tea. A record kept by the Foxconn Volunteer Team — and left open for whoever walks it next. 石門水庫上游的一條小溪谷。一整天的雙手、根系、土壤與茶。這是鴻海志工隊的紀錄，也留給下一組走這條路的人繼續寫。
01 — Where we are standing01 — 我們站在哪裡
Jilongkeng (雞籠坑) is a small creek valley on the Longtan side of Shimen Reservoir. Uphill there are tea terraces and farm roads; downhill there are houses, cafés and a theme park; in between there is forest, water and everything that still needs both. That awkward, honest overlap is exactly why it is worth studying — and why Foxconn's Satoyama Project chose it as a four-season biodiversity path. 雞籠坑是石門水庫龍潭側的一條小溪谷。往上是茶園與農路，往下是住宅、咖啡店與遊樂園；中間，是森林、溪水，以及需要兩邊都存在才能活下去的生命。正是這種尷尬又誠實的交疊，讓它值得被長期研究——也是鴻海里山計畫把它設為四季生物多樣性步道的原因。
The red pin sits west of Longtan District, in the green ridge country above the reservoir. To the east you can see the blue arm of Shimen Reservoir; to the south the Hsinchu county line and Guanxi. Every drop that leaves our trail travels through this picture. Water supply protection is not an abstraction here — it is downhill. 紅色標記位於龍潭區西側、水庫上方的綠色稜線區。東邊可以看到石門水庫的藍色湖臂，南邊是新竹縣界與關西。離開步道的每一滴水都會經過這張圖。所謂水源地保育，在這裡不是抽象名詞——它就在下坡處。
24°50'18.3"N 121°10'48.0"E
Open trail location in Maps在地圖開啟步道定位Zoom in and the label 雞籠坑 appears mid-slope, with the Kanwang (渴望) residential blocks, a school, cafés and small factories pressed against the forest edge. Farm plots, a golf course car park and the creek all share one hillside. This is our biodiversity path: not wilderness, but a working edge. 放大後，「雞籠坑」的地名出現在山坡中段，渴望園區社區、學校、咖啡店與小型廠房緊貼著林緣。農地、球場停車場與溪流共用同一片山坡。這就是我們的生物多樣性步道：不是荒野，而是一條運作中的邊界。
Dabeikeng (大北坑): ribboned contour tea rows, ponds, homestays and a hundred-year-old tree. Look at the pattern — tea is never one field. It is stitched between woodland, farm ponds and gullies. That mosaic is the landscape unit we actually study. 大北坑：沿等高線排列的茶壟、埤塘、民宿與百年老樹。看看這個紋理——茶園從來不是一整片農地，它被縫在林地、埤塘與溪溝之間。這個鑲嵌體，才是我們真正研究的地景單元。
Directions to the tea fields前往茶園路線02 — The route of the day02 — 這一天的路線
This is the paper agenda we carried, turned into something you can walk through. Each marker holds what you would only learn by being there.這是我們當天帶著的紙本行程表，變成一條你可以走進去的路線。每個點裡，放的是「在現場才會知道」的事。
▽ tap a stop to open it點一下站點展開
Gloves on, hand tools counted, water checked. No herbicide goes onto this hillside — everything today is done by hand, because we are standing in a drinking-water catchment. The briefing sets the frame for the whole Satoyama Project: biodiversity, natural soil carbon, source-water conservation, environmental education. Three years, one hillside, many hands. 戴上手套、清點手工具、確認飲水。這片山坡不使用除草劑——今天所有工作都以人力完成，因為我們站在飲用水集水區裡。行前說明也把整個里山計畫的框架講清楚：生物多樣性、自然土壤碳匯、水源地保育、環境教育。三年、一片山坡、很多雙手。
Rule of the day: take the root, leave the soil. Never leave bare ground behind.當日守則：連根帶走，把土留下。絕不留下裸露地表。
The morning's real work: pulling Mikania micrantha — mile-a-minute weed, called the Green Cancer in our project documents — off the canopy edge. It smothers trees like a wet blanket until they cannot photosynthesise. Cutting is not enough. Cut stems root again where they fall. 上午真正的工作：把小花蔓澤蘭——計畫文件裡稱之為「綠色癌症」——從林緣樹冠上拉下來。它像一床濕毯子蓋住樹木，讓植物無法行光合作用。只是剪斷是不夠的，斷莖落地就會再生根。
Full protocol in the next chapter ↓ — this is the part you cannot learn from a photo.完整作法在下一章 ↓ ——這一段，看照片是學不會的。
Guided walk along the creek, following the story of one animal: the crab-eating mongoose. Checkpoints along the steps — tracks, scat, crab shells, water clarity. Children in the team usually find the first clue. 沿溪導覽，跟著一種動物的故事走：食蟹獴。步道階梯之間設闖關點——足跡、排遺、蟹殼、水的清澈度。通常第一個線索都是隊上的小朋友找到的。
Why one animal? Because it can only live where the water is still clean. It is a signal, not a mascot.為什麼是牠？因為牠只能活在水還乾淨的地方。牠是訊號，不是吉祥物。
We kneel down, open the litter layer with our fingers and smell it. Is it breathing? Where does the dark colour stop? How deep do the roots go before the red clay begins? These are the questions behind Nature-based Solutions — and behind the long-term baseline work the National Taiwan University research team is building here. 我們蹲下來，用手指撥開落葉層，聞一聞。它在呼吸嗎？深色的土到哪裡就停止了？根系走到多深才碰到紅色黏土？這些就是自然為本解決方案（NbS）背後的問題，也是國立臺灣大學研究團隊在這裡建立長期基準的工作內容。
Green carbon enters through leaves. Yellow carbon stays in the soil. Chapter 05 turns that into a game.綠碳從葉子進來，黃碳留在土裡。第 05 章把它變成一個遊戲。
Local Hakka table: mountain vegetables, farm produce, tea in the cooking. Lunch is also fieldwork — look at what is on the plate and you can read how this community turns its ecosystem into a livelihood. Conservation that ignores the local economy does not last a season. 在地客家菜：山蔬、農產、入菜的茶。午餐也是田野調查——看看盤子裡的東西，就能讀出這個社區如何把生態轉成生計。忽略在地經濟的保育，撐不過一季。
Ask the kitchen one question: which ingredient here changed the most in ten years?問廚房一個問題：這裡哪一種食材，十年來變化最大？
Hands into the leaves. Withering, pan-firing (殺青), rolling, picture-book storytelling for the younger partners, tea-bag DIY, then tasting. Northern Taiwan's Baozhong tradition is lightly oxidised — the aroma is the point: orchid, osmanthus, a clean sweetness at the back of the throat. 把手放進茶葉裡。萎凋、殺青、揉捻，為小夥伴準備的繪本解說，茶包 DIY，然後品茶。北台灣的包種茶傳統屬輕發酵——香氣就是重點：蘭花香、桂花香，喉韻乾淨帶甜。
Forest → rainfall → spring water → tea bush → leaf → the cup in your hand. One unbroken chain, and you just held three links of it.森林 → 降雨 → 水源 → 茶樹 → 茶葉 → 你手上的這杯。一條沒有斷開的鏈，而你剛剛親手握住了其中三環。
Most people meet tea inside a cup. Standing in the rows is different: you feel the slope under your feet, the drainage, the mist that arrives in the late afternoon, the woodland edge thirty metres away where the birds live. 多數人是在杯子裡認識茶的。站在茶壟之間完全不同：你會感覺到腳下的坡度、排水、午後上來的雲霧，以及三十公尺外那條鳥住的林緣。
Landscape scale: a tea garden is not a field, it is a patch in a Forest–Tea–Water mosaic. Manage the patch, and you are managing the watershed.地景尺度：茶園不是一塊農地，而是「森林–茶園–水系」鑲嵌體中的一個斑塊。你管理這個斑塊，就是在管理整個集水區。
Bags weighed, tools returned, notebooks out. We do not close the questions at the end of the day — we hand them forward. Every quarter another team walks the same steps, and the record grows one season thicker. 秤重、還工具、拿出筆記本。我們不在一天結束時把問題關掉——我們把它交下去。每一季都有另一組夥伴走同樣的階梯，這份紀錄就再厚一季。
This day is not an event. It is one entry in a long-running observation.這一天不是一場活動，而是一份長期觀察中的一筆紀錄。
03 — Field skill03 — 現場技術
Mikania micrantha — mile-a-minute vine, originally from tropical America — is one of Taiwan's most serious invasive plants. It grows several centimetres a day, climbs anything, and throws a continuous sheet over the canopy. Underneath that sheet, native plants stop photosynthesising and slowly die. 小花蔓澤蘭（Mikania micrantha）原產中南美洲，是台灣最嚴重的外來入侵植物之一。它一天可以生長數公分，攀附任何東西，並在樹冠上鋪成一整片。被蓋住的原生植物無法光合作用，會慢慢衰弱死亡。
What it costs us here, specifically: native seedlings suppressed; understorey vegetation killed off; the ground layer dried out; firefly habitat degraded, because firefly eggs and larvae need damp, shaded, undisturbed litter. Lose the understorey and you lose the light show in April. 在這裡具體的代價是：原生苗木被壓制、底層植被死亡、地表變得乾燥、螢火蟲棲地退化——因為螢火蟲的卵與幼蟲需要潮濕、遮蔭、未受干擾的落葉層。失去底層植被，就會失去四月的那場光。
“Clearing Mikania is not weeding. It is buying room for a native ecosystem to start growing again.清除小花蔓澤蘭，不是在拔雜草，而是在替原生生態系爭取重新生長的空間。”
04 — Indicator species04 — 指標物種
Urva urva · 食蟹獴Crab-eating Mongoose
Long body, long coarse tail, quick and low to the ground — somewhere between a weasel, a meerkat and a small raccoon. A native Taiwanese carnivore that sticks to streams, riverbanks and damp forest, and eats crabs, fish, amphibians and insects. Hence the name. 身體細長、尾巴粗長、動作靈活貼地——像黃鼠狼、狐獴與小浣熊的混合體。牠是台灣原生的小型食肉動物，倚賴溪流、河岸與潮濕森林，吃螃蟹、魚、兩棲類與昆蟲，因此得名。
Why we walk its story instead of a plant list: a predator that hunts freshwater crabs cannot fake it. It needs clean water, a living stream bed, cover along the banks and low human disturbance — all at once. If the water turns dirty, if the channel is concreted, if the prey disappears, the mongoose simply leaves. 為什麼我們用牠的故事來導覽，而不是唸一份植物名錄：一種以溪蟹為食的掠食者無法作假。牠同時需要乾淨的水、有生命的溪床、岸邊掩蔽與低度人為干擾。水一髒、溪一水泥化、獵物一消失，食蟹獴就會離開。
It is a signal species: a living, four-legged readout of the health of this whole catchment.牠是訊號物種（signal species）：一份會走路的、活的集水區健康報告。
Seen nothing? Write down what the water looked like instead. Absence is data too.什麼都沒看到？那就寫下水看起來的樣子。「沒有」也是資料。
05 — Nature's magic trick, made visible05 — 把自然的魔法變得看得見
Air becomes leaf. Leaf becomes litter and char. Litter becomes soil organic matter. Some of it stays for decades — bound to clay, tucked inside aggregates, out of reach of microbes. That last step is the whole point of a Nature-based Solution: a negative-carbon habit the hillside performs for free, if we let it. 空氣變成葉子，葉子變成落葉與炭，落葉變成土壤有機質。其中一部分會留存數十年——被黏粒吸附、藏在團粒之中，微生物碰不到。最後這一步，就是自然為本解決方案的核心：只要我們不妨礙，這片山坡會免費執行一套負碳的習慣。
The soil column土壤剖面
Most of the carbon action happens in the first 30 cm — which is exactly the layer a heavy summer downpour can wash off a bare slope in one afternoon.碳的故事幾乎都發生在最上面 30 公分——而這正是一場夏季暴雨，可以在一個下午從裸坡上沖走的那一層。
Play: what happens to the sink?來玩：碳匯會怎麼樣？
Tap the practices below. Green ones are things our volunteer days actually do; amber ones are what this hillside faces.點下面的做法。綠色是我們志工日實際會做的事；琥珀色是這片山坡實際面對的狀況。
Baseline hillside, mid-summer. Choose something and watch the sink move.盛夏的基準山坡。選一項，看看碳匯怎麼變。
06 — If you were a soil-monitoring AI06 — 如果你是一個土壤監測 AI
Below are the standard parameters and the typical reference ranges for humid subtropical hillside and tea soils in northern Taiwan — including the acidic red lateritic soils of the Taoyuan tableland. Treat them as the yardstick to compare our own samples against, not as our measured results; the measured baseline is being built by the NTU research team over multiple years. 以下是標準監測參數，以及北台灣濕潤亞熱帶山坡地與茶園土壤（含桃園台地酸性紅壤）的一般參考範圍。請把它們當成比對用的量尺，而不是我們的實測結果；實測基準正由臺大研究團隊以多年期方式建立。
| Parameter參數 | Typical range here在地典型範圍 | Why an AI would care為什麼值得長期監測 |
|---|---|---|
| Bulk density總體密度 | 0.8–1.2 g/cm³ trail: >1.5 | Rises when soil is compacted. Above ~1.5 g/cm³ roots and water struggle. Also required to convert %C into tonnes of carbon per hectare.土壤被踩實就上升。超過約 1.5 g/cm³ 時根系與水分都難以通過。也是把「碳含量 %」換算成「每公頃碳噸數」的必要參數。 |
| Moisture水分含量 | 15–40 % vol. rain ≈2,000–2,600 mm/yr | Drives decomposition speed. Here the year is split between plum rains, typhoon downpours and dry winter spells — the swing matters more than the average.決定分解速率。這裡的一年被梅雨、颱風暴雨與冬季乾期切開——擺盪幅度比平均值更重要。 |
| Texture質地 | silty clay loam → clay坋質壤土→黏土 | Clay protects carbon by binding it. Taoyuan's lateritic red soils are clay-rich but heavily weathered — good at holding, poor at supplying.黏粒會吸附並保護有機碳。桃園紅壤黏粒多但風化深——擅長「留住」，不擅長「供給」。 |
| Soil organic carbon有機碳 (SOC) | forest 2–5 % tea 1–2 %森林 2–5 % 茶園 1–2 % | The headline number for a carbon sink. Slow to build, fast to lose. Always report with depth and bulk density or it means nothing.碳匯的核心數字。累積慢、流失快。若不同時附上取樣深度與總體密度，這個數字沒有意義。 |
| pH | 4.0–5.5 | These soils are naturally acidic; tea likes it that way (4.5–5.5). Watch for further acidification from fertiliser and heavy rain leaching bases away.此地土壤本就偏酸，茶樹也偏好（4.5–5.5）。要留意施肥與強降雨淋洗鹽基造成的進一步酸化。 |
| Electrical conductivity電導度 (EC) | < 0.5 dS/m | A cheap, fast proxy for salt and fertiliser load. Spikes after over-fertilising; useful as an early-warning channel.快速便宜的鹽分／肥料負荷指標。過量施肥後會飆升，適合作為早期警示訊號。 |
| Cation exchange capacity陽離子交換容量 (CEC) | 5–15 cmol(+)/kg | Low in weathered red soils. Raising organic matter is the main lever we have to raise nutrient-holding capacity here.在深度風化的紅壤中偏低。提高有機質，幾乎是我們能提升保肥力的唯一槓桿。 |
Ranges compiled from FAO / GSP soil guidance and Taiwan agricultural & tea research references — see the reference list at the foot of this page.範圍整理自 FAO／全球土壤夥伴關係之土壤指引與台灣農業、茶業研究文獻——參見頁尾參考資料。
In a garden you dig where it looks interesting. In a survey you must dig where it is representative — and that changes everything. 在自家院子，你會挖看起來有趣的地方；在調查裡，你必須挖「有代表性」的地方——這一點改變了一切。
Will it freeze here?這裡會結冰嗎？ Almost certainly not — at this elevation in Taoyuan, frost is rare and freeze–thaw is not the force shaping this soil. The forces here are heat, humidity and violent rain: rapid decomposition, deep leaching, and the erosive energy of a summer downpour. That is why ground cover, not frost protection, is the local carbon strategy. 幾乎不會——在桃園這個海拔，霜是罕見的，凍融循環也不是形塑這片土壤的力量。這裡的力量是高溫、高濕與強降雨：快速分解、深度淋洗，以及暴雨的沖蝕能量。所以在地的碳策略是「地表覆蓋」，而不是防凍。
07 — Open the forest door07 — 打開林間的門
Press the door. You become something small and you land somewhere on these steps. Whatever appears in the window is something that genuinely lives along this kind of creek in northern Taiwan. Don't rush to a conclusion — greet it, guess it, sketch it, write it down. 按下那扇門。你會變成某個很小的東西，落在這些階梯的某一處。窗裡出現的，都是真實生活在北台灣這類溪谷的生命。不要急著下結論——先打招呼、猜一猜、畫一畫、寫下來。
You are: an Oriental honey bee你是：一隻東方蜜蜂
Taiwan Blue Magpie台灣藍鵲
Urocissa caerulea
Native · endemic原生 · 特有種A long blue tail crosses the path like a dropped ribbon. Loud, clever, and always travelling as a family gang.一道長長的藍尾巴橫過步道，像掉落的緞帶。吵鬧、聰明，總是一整個家族一起行動。
Count them — how many in the group today?數數看，今天這一群有幾隻？
Your notebook page你的筆記頁
Notes stay in this browser only — nothing is sent anywhere. Copy them into your own Earth Letter when you are ready.筆記只留在這個瀏覽器，不會被傳送到任何地方。準備好了，再把它抄進你自己的 Earth Letter。
Some days the job is not looking — it is clearing. Log what your hands did, too.有些日子的任務不是「看」，而是「清」。也記下你的雙手做了什麼。
08 — Ask like Socrates08 — 像蘇格拉底那樣提問
Question generator提問產生器
If this slope were bare tomorrow, where would the first spoonful of soil go — and whose water would it enter?如果這片坡明天變成裸地，第一匙土會往哪裡走——它會進入誰的水？
We come here to wake up our senses, not to answer fast. A good question survives a season. Write yours down, leave it open, and let the winter team look for it. That is your link to Earth. 我們來這裡是為了喚醒感知力，不是為了快速回答。一個好問題可以活過一整季。把你的問題寫下來、讓它保持開放，交給冬天來的那一隊繼續找。這就是你與地球的連結。
Jilongkeng field slip雞籠坑 田野紙條
Saved in this browser only. Bring it back next season and compare.僅儲存在本機瀏覽器。下一季帶著它回來比對。
09 — The day, in pictures09 — 這一天的影像
22 Aug 2026 · Foxconn Volunteer Team & our little nature partners — thank you, all of you.鴻海志工隊與我們的小小自然夥伴——謝謝你們每一位。
10 — Four seasons, one trail10 — 四季，一條步道
Our team walks this route every quarter. If each season's notes connect, this stops being an event album and becomes a record — the kind that only makes sense after five or ten years. 我們的團隊每一季都走這條路線。如果每一季的筆記能連起來，它就不再是活動相簿，而是一份紀錄——那種要五年、十年後才看得出意義的紀錄。
Check the damp, shaded litter we protected. Count light, not insects.檢查我們守下來的潮濕遮蔭落葉層。數光，不數蟲。
Peak invasive growth, peak erosion risk. This day, 22 Aug, sits here.外來種生長最快、沖蝕風險最高。8/22 這一天就在這裡。
Remove Mikania before it flowers. Watch the tea gardens turn.趕在開花前移除小花蔓澤蘭，看茶園換季。
Best season to read the slope, the gullies and the soil profile.最適合讀懂坡面、沖蝕溝與土壤剖面的季節。
Make your own Earth Station, paste this station's link into yours, and we are connected. Then next spring, next winter, five years from now, a note you made beside one particular rock becomes the unique record of this trail on that day. Walden began the same way. 建立你自己的 Earth Station，把這個站的連結貼進去，我們就串起來了。然後在明年春天、明年冬天、五年之後，你在某一塊石頭邊寫下的筆記，就會成為這條步道在那一天唯一的紀錄。《湖濱散記》也是這樣開始的。
Draw for ten minutes. Write six lines. That is already an Earth Letter.畫十分鐘，寫六行。那就已經是一封 Earth Letter 了。
The letter we grew from我們的起點
This station answers an Earth Letter we love, and adds the Foxconn team's own Nature Partners Time Bank record from 22 Aug 2026.這個站是對一封我們很喜歡的 Earth Letter 的回應，並加上鴻海團隊 2026/8/22 的自然夥伴時間銀行紀錄。
Read the original Earth Letter閱讀原始 Earth Letter11 — Sources & further learning11 — 資料來源與延伸學習
Species, soil and watershed statements on this page are grounded in the public sources below. Field-day details, photos and the agenda come from the Foxconn Volunteer Team's own record of 22 August 2026. 本頁的物種、土壤與集水區敘述，依據以下公開資料來源。當日的行程細節、照片與議程，出自鴻海志工隊 2026 年 8 月 22 日的自身紀錄。