森林的“碳汇饱和”是什么意思？
What does 'carbon sink saturation' of forests mean?
随着森林成熟和氮等养分限制，单位面积年固碳速率会下降，老林趋于碳平衡；此外火灾、虫害与暖干化也会让既有碳汇减弱甚至变碳源。
As forests mature and hit nutrient limits, per-area annual carbon uptake slows and old stands approach equilibrium; fire, pests and warming-drying can also weaken or reverse the sink.
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
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#碳汇饱和 #森林 #养分限制
泥炭地面积很小，却储存了多少土壤碳？
Peatlands cover little area—yet how much soil carbon do they store?
泥炭地仅占陆地面积约 3%，却储存了约相当于全部森林两倍多的土壤有机碳（约 30% 的陆地土壤碳），是缓慢积累、极易因排干而释放的“碳宝库”。
Peatlands are ~3% of land but hold over twice the soil carbon of all forests (about 30% of terrestrial soil carbon)—a slowly built, easily released store once drained.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
G. Tyler Miller,《Living in the Environment》Cengage 多版
G. T. Miller, Living in the Environment, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL66394W：Living in the environment
#泥炭地 #土壤碳 #湿地
城市里的树木除了固碳，还能靠什么给城市降温？
Besides storing carbon, how do city trees cool the urban area?
树荫遮挡阳光直接降温，叶片蒸腾把液态水变成水汽会带走热量，两者叠加能明显降低局部气温、缓解热岛。
Tree shade blocks sunlight directly, and leaf transpiration turns liquid water into vapor, removing heat; together they lower local temperature and ease the heat island.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#城市树木 #蒸腾 #降温