亚马孙雨林的碳汇功能是否在减弱？
Is the Amazon rainforest's carbon sink weakening?
多项长期观测表明，部分亚马孙区域已从净碳汇转为净碳源，主因是砍伐、火灾和干旱加剧。树木死亡与燃烧释放的碳开始超过新生林的固定量。若趋势持续，亚马孙可能越过退化临界点，转为释放碳的源。
Long-term observations show parts of the Amazon have shifted from a net carbon sink to a net source, mainly due to logging, fire, and intensifying drought. Carbon released by dying and burning trees is beginning to exceed what regrowing forest fixes. If the trend continues, the Amazon could cross a degradation tipping point and become a carbon source.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《自然》;全球碳计划
Nature;Global Carbon Project
#亚马孙 #碳汇 #森林退化
森林经营中,间伐对林分碳汇的净效应为什么在学术界仍有争议?
In forest management, why is the net effect of thinning on stand-level carbon sequestration still debated?
间伐降低单位面积立木密度,短期内往往减少林分生物量碳储量,而保留木因竞争缓解而加速生长,单木碳积累上升。净效应取决于间伐强度、轮伐期、林分年龄以及采伐剩余物与土壤碳的动态,不同研究给出的结论差异明显。若再计入木质林产品的碳替代效应,结论还会进一步分化。
Thinning lowers stand density and often reduces biomass carbon stocks in the short run, while residual trees grow faster once competition is eased, raising per-tree carbon gain. The net outcome hinges on thinning intensity, rotation length, stand age, and the dynamics of harvest residues and soil carbon, which is why published results diverge. Adding substitution credits for harvested wood products widens the disagreement further.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review结论有争议 · Contested
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Naudts M 等,《欧洲森林经营未能缓解气候变化》,Science,2018
Naudts M et al., Europe's forest management did not mitigate climate change, Science, 2018
#森林经营 #碳汇核算
仅凭植树造林能解决气候变化吗？
Can tree planting alone solve climate change?
植树能增加碳汇、改善生态，但单靠造林难以抵消全部化石燃料排放，且碳储存可被火灾逆转。选址不当还可能减少反照率或挤占粮食用地。造林应与深度减排并举，而非替代减排。
Planting trees adds sinks and improves ecology, but afforestation alone cannot offset all fossil emissions, and stored carbon can be reversed by fire. Poor siting may also lower albedo or squeeze farmland. Afforestation should accompany deep cuts, not replace them.
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
#植树造林 #碳汇 #局限
轮伐期的长短如何影响人工林的固碳能力？木质产品对高排放材料的替代效应在碳核算中应怎样处理？
How does the length of rotations affect the carbon uptake of plantation forests, and how should the substitution of wood products for high-emission materials be treated in carbon accounting?
短轮伐期使林分长期处于速生阶段，单位面积年净固碳量较高，但蓄积量与土壤碳库难以充分积累；长轮伐期能提高生态系统总碳储量，却降低采伐收益并随林分老化出现增速放缓。当木材进入建筑、家具等耐用领域时，碳被长期封存，同时替代钢材、水泥等高耗能材料，产生额外减排。规范核算需同时列明森林生态系统碳库、耐用木制品碳库与替代减排量，并交代系统边界和时间尺度，否则不同研究的结论无法比较。
Short rotations keep stands in their fast-growing phase, lifting mean annual carbon uptake per hectare, but leave little time for growing stock and soil carbon pools to accumulate; long rotations raise total ecosystem carbon storage while depressing harvest revenues and slowing growth as stands age. When wood enters durable uses such as construction and furniture, its carbon stays locked away and displaces energy-intensive materials like steel and cement, yielding additional avoided emissions. Sound accounting lists forest ecosystem pools, durable wood-product pools, and substitution credits side by side, stating explicit system boundaries and time horizons, because results cannot be compared without them.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
政府间气候变化专门委员会《土地利用、土地利用变化和林业良好做法指南》；联合国粮农组织《全球森林资源评估》
IPCC Good Practice Guidance for Land Use, Land-Use Change and Forestry; FAO Global Forest Resources Assessment
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.29171/azu_acku_pamphlet_sd235_a38_g563_20
#森林经营 #碳汇核算
热带雨林通常分为哪几层结构？
What are the typical layers of a tropical rainforest?
热带雨林一般分四层：露生层、冠层、下层植被和森林地被。冠层是光合作用和生物多样性的主战场，承接大部分阳光。这种分层结构支撑了极高的物种丰富度。
A tropical rainforest is usually divided into four layers: emergent, canopy, understory, and forest floor. The canopy is the main arena for photosynthesis and biodiversity, capturing most sunlight. This layering supports extremely high species richness.
难度 入门 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
Kauffman《热带森林生态学基础》
Kauffman, D.S. & Kauffman, R.P., Fundamentals of Tropical Forest Ecology
#雨林 #分层 #生物多样性
红树林在生态系统和气候中扮演什么角色？
What role do mangroves play in ecosystems and climate?
红树林是生长在热带海岸的木本植物群落，单位面积固碳能力极高，是重要的蓝碳生态系统。它们的根系缓冲风暴潮、保护海岸并养育大量海洋生物。破坏红树林会同时损失碳储量和海岸防护功能。
Mangroves are woody plant communities on tropical coasts with very high per-area carbon storage, making them important blue-carbon ecosystems. Their roots buffer storm surges, protect shorelines, and nurture abundant marine life. Destroying mangroves sacrifices both carbon stores and coastal protection.
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
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
#红树林 #蓝碳 #海岸防护
森林为什么被称为碳汇？
Why are forests called a carbon sink?
森林通过光合作用吸收大气中的CO2，把碳固定在树木、落叶和土壤里。健康的森林每年净吸收大量碳，从而抵消部分人为排放。毁林则会把这些储存的碳重新释放回大气。
Forests absorb atmospheric CO2 through photosynthesis and store the carbon in trees, litter, and soils. Healthy forests take up large amounts of carbon each year, offsetting some human emissions. Deforestation releases that stored carbon back to the atmosphere.
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
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
#森林 #碳汇 #光合作用
森林砍伐如何影响气候？
How does deforestation affect climate?
砍伐森林既消除了吸收CO2的碳汇，又把储存的碳通过燃烧和腐烂释放出来。它还会改变区域水循环和地表反照率，进一步影响气候。全球约一成温室气体排放与毁林和土地利用变化有关。
Deforestation removes a CO2-absorbing sink and releases stored carbon through burning and decay. It also alters regional water cycles and surface albedo, further affecting climate. Roughly a tenth of global greenhouse gas emissions come from deforestation and land-use change.
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
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
#森林砍伐 #碳排放 #土地利用