讀書報(bào)告4_土壤碳固定對(duì)全球氣候變化和糧食安全的影響-資料下載頁
2025-01-18 20:07本頁面
【正文】 l sink capacity and permanence are related to clay content and mineralogy, structural stability, landscape position, moisture and temperature regimes, and ability to form and retain stable microaggregates. 土壤碳固定是一個(gè)自然的，劃算的和環(huán)境友好的過程。 土壤碳庫的容量和持久性是與粘粒含量和礦物學(xué)、結(jié)構(gòu)的穩(wěn)定性，地理位置，水分和溫度狀態(tài)，以及穩(wěn)定性團(tuán)聚體的形成和保持的能力聯(lián)系緊密的。 Carbon Sequestration and Global Food Security 土壤碳固定和全球糧食安全 Global hotspots of soil degradation with a high priority for soil restoration and C sequestration include SSA, central and south Asia, China, the Andean region, the Caribbean, and the acid savannas of South America. As a source of nutrients for growing crops, the SOC pool is a mean of production in subsistence farming systems of SSA, which accounts for only % of the fertilizer consumption and 2% of the world’s irrigated land area, both essential to SOC sequestration. 當(dāng)生長的作物作為養(yǎng)分的一個(gè)源時(shí)，在 SSA的自給農(nóng)業(yè)中土壤有機(jī)碳庫是作物生產(chǎn)的一種手段。 (SSA僅占世界肥料消耗的 %，占世界灌溉土地的 2%，而這些對(duì)于土壤有機(jī)碳的固定是很重要的。 ) Carbon Sequestration and Global Food Security Fertilizer application is an important strategy of increasing crop yield in SSA (27), but its effectiveness is enhanced when used in conjunction with crop residue mulch (28) or trees (20). 肥料的施用對(duì)于在 SSA的作物產(chǎn)量的增加是一個(gè)非常重要的策略 (27)，但是當(dāng)通過使用作物殘?jiān)母采w (28)或是固氮的豆科喬木休耕 (20)與施肥手段相結(jié)合時(shí)，它的效益將提高。 Carbon Sequestration and Global Food Security An increase of 1 ton of soil carbon pool of degraded cropland soils may increase crop yield by 20 to 40 kilograms per hectare (kg/ha) for wheat, 10 to 20 kg/ha for maize, and to 1 kg/ha for cowpeas. 在退化的耕地土壤上每增加 1噸的土壤有機(jī)碳可以使小麥的產(chǎn)量每公頃增加 20到 40Kg，玉米的產(chǎn)量每公頃增加 10到 20Kg，豇豆的產(chǎn)量每公頃增加 1Kg。 Carbon Sequestration and Global Food Security Fig. 4. The vicious cycle of deletion in soil anic matter–decline in crop yield–food insecurity–soil and environmental degradation can be broken by improving soil fertility. As well as enhancing food security, carbon sequestration has the potential to offset fossilfuel emissions by to gigatons of carbon per year, or 5 to 15% of the global fossilfuel emissions. Soil anic carbon is an extremely valuable natural resource. Yet, the close link between soil C sequestration and world food security on the one hand and climate change on the other can neither be overemphasized nor ignored. Thanks for your time !
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