食物系统温室气体排放核算应涵盖哪些环节？
Which stages should food-system greenhouse gas accounting cover?
完整核算包括土地利用变化、农业生产、加工运输、零售浪费和消费端烹饪。仅算农场排放会低估冷链、甲烷与食物浪费的贡献。
Full accounting spans land-use change, farm production, processing and transport, retail waste, and household cooking. Farm-only counts understate cold-chain, methane, and food-waste contributions.
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
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
#食物系统 #排放核算 #全生命周期
遥感与精准农业如何协同提升资源利用效率？
How do remote sensing and precision agriculture jointly improve resource efficiency?
卫星与无人机获取作物长势与水分胁迫图，指导变量施肥灌溉，减少过量投入与径流污染。它把管理从地块均一转向按需分区。
Satellites and drones map crop vigor and water stress to guide variable-rate fertilization and irrigation, cutting excess input and runoff pollution. Management shifts from uniform to on-demand zoning.
难度 专业 · 适合 初中(12-15)
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。
《环境科学》精准农业遥感
Environmental Science China precision agriculture
#精准农业 #遥感 #变量管理
再生农业的免耕、覆盖作物与轮牧主要通过哪些机制改善土壤结构与微生物群落？
Through what mechanisms do no-till, cover crops, and managed grazing in regenerative agriculture improve soil structure and microbial communities?
免耕减少扰动以保留土壤团聚体，覆盖作物持续输入根系碳并喂养微生物，轮牧促进草类再生与有机质回田。三者共同提升孔隙度、持水力和微生物多样性。
No-till preserves aggregates by reducing disturbance, cover crops continuously supply root carbon to feed microbes, and managed grazing renews grasses while returning organic matter. Together they raise porosity, water retention, and microbial diversity.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Mubvumba 等,《Enhancing long-term no-till wheat systems with cover crops and flash grazing》,Soil Security,2022 (DOI: 10.1016/j.soisec.2022.100067)
Mubvumba et al., 'Enhancing long-term no-till wheat systems with cover crops and flash grazing', Soil Security, 2022, DOI: 10.1016/j.soisec.2022.100067
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1016/j.soisec.2022.100067
#再生农业 #土壤结构 #微生物
害虫综合治理（IPM）为什么以“经济损害水平”作为是否施药的判据，而不是见虫就打？
Why does Integrated Pest Management use an “economic injury level” as the criterion for spraying rather than treating whenever pests appear?
经济损害水平是害虫密度使“减产损失恰好等于防治成本”的临界点，低于它时用药得不偿失。IPM 在该点下方另设较低的防治阈值以争取提前干预的时间，并优先借助田间天敌与农艺管理压低虫口基数，让化学农药退居最后手段，从而在保住产量的同时延缓害虫抗药性演化、减少对非靶标生物的伤害。
The economic injury level is the pest density at which expected yield loss just equals the cost of control; below it, spraying costs more than it saves. IPM sets a lower action threshold beneath that point to allow timely intervention and relies first on field natural enemies and agronomic management to suppress populations, demoting insecticides to a last resort. Yield is protected while the evolution of resistance slows and harm to non-target organisms declines.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Stern, Smith, van den Bosch, Hagen,《The integration of chemical and biological control of the spotted alfalfa aphid: The integrated control concept》,Hilgardia,1959 (DOI: 10.3733/hilg.v29n02p081)
Stern, Smith, van den Bosch, Hagen, 'The integration of chemical and biological control of the spotted alfalfa aphid: The integrated control concept', Hilgardia, 1959, DOI: 10.3733/hilg.v29n02p081
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.3733/hilg.v29n02p081
#害虫综合治理 #经济损害水平 #防治阈值
城市社区花园与都市农业如何提升食物可及性与城市韧性？
How do urban community gardens and city agriculture improve food access and urban resilience?
社区花园在闲置地生产新鲜蔬果，缩短食物里程并降低低收入社区获取健康食物的门槛。它们还在灾害时提供本地补给，并增强邻里社会联结。
Community gardens grow fresh produce on vacant land, shortening food miles and lowering barriers for low-income neighborhoods to access healthy food. They also supply local food during disruptions and strengthen social ties.
难度 进阶 · 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。
《Nature Sustainability》城市农业研究
Nature Sustainability urban agriculture
#都市农业 #社区花园 #食物可及性
以植物为主的膳食为何能降低环境足迹？
Why can plant-forward diets lower environmental footprints?
植物性食物的生产通常比畜禽产品耗用更少土地、水和温室气体排放。转向植物基膳食是减缓食物系统排放的高性价比途径。
Plant foods generally need less land, water, and greenhouse gas per calorie than animal products. Shifting to plant-forward diets is a cost-effective way to cut food-system emissions.
难度 进阶 · 适合 初中(12-15)
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。
《Science》食物系统排放研究
Science food system emissions
#可持续膳食 #植物基 #食物足迹
土壤在碳循环中扮演什么角色？
What role does soil play in the carbon cycle?
土壤是全球最大的陆地碳库，储存的有机碳超过大气与植被之和。植物残体经微生物分解缓慢积累为土壤有机质，形成长期封存。耕作、侵蚀和升温会促使其中碳重新释放。
Soil is the largest terrestrial carbon pool, holding more organic carbon than the atmosphere and vegetation combined. Plant debris slowly accumulates as soil organic matter through microbial decomposition, forming long-term storage. Tillage, erosion, and warming can prompt that carbon to be released again.
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
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
#土壤碳 #碳库 #农业
减少食物损失与浪费为何是减缓气候变化的重要手段？
Why is cutting food loss and waste a major climate mitigation lever?
未被消费的食物其生产排放被白白浪费，且厨余在填埋场释放甲烷。减少损耗可避免相应土地、水与排放投入。
Food never eaten wastes the emissions of its production, and discarded scraps emit methane in landfill. Reducing loss avoids the associated land, water, and emission inputs.
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
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
#食物浪费 #甲烷 #减排
食物损失与食物浪费有什么区别?减少两者对粮食安全和碳排放各意味着什么?
How do food loss and food waste differ, and what does cutting each mean for food security and carbon emissions?
食物损失发生在生产、采后处理、储存和运输环节,多因技术与基础设施不足;食物浪费发生在零售、餐饮和家庭消费端,属于行为与制度问题。FAO估算全球约三分之一的食用产量被损耗或浪费,对应约8–10%的人为温室气体排放和巨大的蓝水与耕地占用。干预优先级因此不同:欠发达地区应投资冷链与仓储,发达地区则需改进日期标签规则、分餐设计与剩余食物再分配渠道。
Food loss occurs on-farm and along post-harvest handling, storage and transport, driven mainly by technical and infrastructure gaps; food waste arises at retail, food service and household stages, rooted in behavior and institutions. FAO estimates roughly one-third of edible output is lost or wasted, linked to about 8-10 percent of anthropogenic greenhouse-gas emissions plus large blue-water and cropland footprints. Priorities diverge accordingly: less-developed regions need cold chains and storage investment, while developed regions gain most from smarter date labeling, portion design and redistribution channels for surplus food.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
FAO《世界粮食与农业状况2019:粮食损失与浪费的进展》;UNEP《食物浪费指数报告2021》
FAO, The State of Food and Agriculture 2019: Moving Forward on Food Loss and Waste Reduction; UNEP Food Waste Index Report 2021
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 perma_cc_FWL4-8QK2：FWL4-8QK2: UNEP Food Waste
#食物浪费 #粮食安全
为什么种植豆科作物能减少农田对化学氮肥的依赖？
Why can growing legume crops reduce farmland's dependence on chemical nitrogen fertilizer?
大豆、苜蓿等豆科作物与根瘤菌共生：根瘤中的固氮酶以光合产物为能源，把空气中的氮气还原为铵供植物利用。轮作或间作豆科后，残茬和根系分解释放的氮素可明显降低下季作物对合成氮肥的需求。由于哈伯法合成氨耗能巨大，且部分氮肥会转化成强效温室气体氧化亚氮，生物固氮既节省成本，也有助于减缓气候变化。
Soybean, alfalfa, and other legumes live in symbiosis with rhizobial bacteria: inside root nodules, nitrogenase enzymes powered by photosynthetic sugars convert atmospheric nitrogen into ammonium the plant can use. After a legume rotation or intercrop, nitrogen released from decomposing residues and roots noticeably cuts the next season's demand for synthetic nitrogen fertilizer. Because Haber-Bosch ammonia synthesis is highly energy-intensive and part of fertilizer nitrogen turns into nitrous oxide, a potent greenhouse gas, biological fixation saves costs while also mitigating climate change.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Herridge, Peoples & Boddey,《Global inputs of biological nitrogen fixation in agricultural systems》,Plant and Soil,2008 (DOI: 10.1007/s11104-008-9668-3)
Herridge, Peoples & Boddey, 'Global inputs of biological nitrogen fixation in agricultural systems', Plant and Soil, 2008, DOI: 10.1007/s11104-008-9668-3
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1007/s11104-008-9668-3
#生物固氮 #豆科轮作 #化肥减量
农业活动主要产生哪些温室气体？
What greenhouse gases mainly come from agriculture?
农业排放以甲烷（反刍动物肠胃发酵、稻田）和氧化亚氮（化肥施用）为主，外加部分CO2来自农机与土地利用。畜牧业尤其是牛肉和奶制品贡献突出。改进饲喂、肥料管理与沼气利用可显著降低排放。
Agriculture emits mainly methane from ruminant digestion and rice paddies and nitrous oxide from fertilizer use, plus some CO2 from machinery and land use. Livestock, especially beef and dairy, stand out. Better feeds, fertilizer management, and biogas can markedly cut emissions.
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
#农业 #甲烷 #氧化亚氮