讀書報(bào)告4_土壤碳固定對全球氣候變化和糧食安全的影響-文庫吧
2025-01-03 20:07 本頁面
【正文】 統(tǒng)有 :農(nóng)田，放牧的草地，退化的或沙漠化土地 ,灌溉的土壤放牧的草地的生態(tài)系統(tǒng)的土壤碳固定潛力不包括在全球的土壤碳固定中，這是因?yàn)樗糠值谋桓采w在其它生態(tài)系統(tǒng)下以及具有很大的不確定性。 Common RMPs that lead to SOC sequestration are mulch farming, conservation tillage, agroforestry and diverse cropping systems, cover crops (Fig. 3), and integrated nutrient management, including the use of manure, post, biosolids, improved grazing, and forest management. 通常導(dǎo)致土壤有機(jī)碳固定的 RMPs措施是：覆蓋農(nóng)業(yè)，保護(hù)性耕作，混農(nóng)林和多樣性種植系統(tǒng) (Fig. 3)，和包括由糞肥、堆肥、生物固體、改善的放牧模式和林地管理的使用的綜合養(yǎng)分管理。 Carbon Sequestration Fig. 3. Important remended management practices are notill farming, cover crops, manuring and agroforestry. (A: Longterm notill plots B: Agroforestry) The rate of SIC sequestration as secondary carbonates is low (5 to 150 kg C/ha per year) and is accentuated by biogenic processes and leaching of carbonates into the groundwater (11, 12), especially in soils irrigated with water containing low carbonates. 作為處于次要地位的碳酸鹽，土壤無機(jī)碳的固定的速率是很低的 (每年 5到150kgC/ha)，土壤無機(jī)碳作為生命必須的過程和碳酸鹽向地下水的淋洗過程被重視， (11,12)特別是在含有低碳酸鹽的水中的土壤灌溉區(qū)。 Carbon Sequestration ?土壤無機(jī)碳的固定 Carbon Sequestration for Mitigating Climate Change 土壤碳固定對氣候變化的緩解 Estimates of the total potential of C sequestration in world soils vary widely from a low of to Gt C/year (9) to a high of to Gt C/year (13). Thus, the potential is finite in capacity and time. Noheless, soil C sequestration buys us time until the alternatives to fossil fuel take effect. Some issues related to this strategy are as follows: 全球土壤碳固定總的潛力的估算值是非常廣泛的，從低的 to Gt C/year (9) 到高的 to Gt C/year (13)。 因此，這種固定的潛力在容量和時(shí)間上是有限的。盡管如此，直到我們能找到化石燃料的替代品時(shí)，土壤碳固定為我們爭取了時(shí)間。 (1).Agricultural chemicals 農(nóng)化用品 Most RMPs involve Cbased input. Item (1 Kg) Need C (Kg) N P2O5 K2O Lime Herbicides Fungicides Insecticides However, inputs are needed not for soil C sequestration per se, but for increasing food production and ensuring sustainable use of soil and water resources. (1).Agricultural chemicals 然而輸入不僅是為了土壤碳固定自身，也是增加了糧食生產(chǎn)，確保水土資源使用的可持續(xù)。 (2).Nutrients required 養(yǎng)分需求 It is estimated that sequestration of 1 Gt of C in world soils would require 80 million tons (Mt) of N, 20 Mt of P, and 15 Mt of K. In parison, the global fertilizer use in 2022 was 136 Mt (17). 據(jù)計(jì)算，世界土壤中 10億噸的碳固定需要 8000萬噸的 N， 2022萬噸的
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