soil carbon: key to address vulnerabilities of agriculture to climate change and food security issues

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présentation powerpoint k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u soil carbon: key to address vulnerabilities of agriculture to climate change and food security issues claire chenu agroparistech – inra, grignon, france claire.chenu@inra.fr- chenu@agroparistech.fr mailto:ccaire.chenu@inra.fr- k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u why soil carbon? k o ro n iv ia j o in t w o rk o n a gr ic u lt u re …

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rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u 2.4 “improve soil quality” 3.9 “reduce …deaths and illnesses from air, water and soil pollution and contamination” 12.4 “chemicals and wastes … reduce their release to air, water and soil ” 15.3 “restore degraded land and soil” k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u fao, gsp, dec 2017 ann ua l c ro ps ban ad a co ffe e te a d eg ra de d fo re st n at ur al fo re st pla nt at io n fo …

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± 0.06 reduced tillage + inputs 64 0.56 ± 0.08 mean 0.41 ± 0. 03 meta-analyses fujisaki et al. (2018) for tropical soils (duration 7 to 22 years) ©cardinael k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u soc storage potential at regions/nations scales e.g. france pellerin, bamière et al. 2019 in press total french ghg emissions 458 mt co2e french agricultural emissions 77 mt co2e total soc stocks 3585 gt c 30 y, combination of practices: +8.43 mt c.y-1 -> 31 mt co2e y-1 7% 41% 86% -25% grassland 0 1 2 3 4 no tillage replace mowing by pasture permanent cover crop in vineyards winter cover crop in …

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s smith et al. 2008 1.4 paustian et al. 2016 2.2 zomer et al. 2017 0.9-1.7 soussana et al. 2019 2.1 gtc year-1 k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u maintain and increase soil carbon: limits, barriers, risks? k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u c storage : how much for how long ? time (years) change in management new equilibrium soc storage potential 0 20 …

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crop residues food production, adaptation, mitigation, environment, co- benefits. farmers - society cover crops © so u fl et restore degraded land ©wadi attir ©t. chevallier agroforestry piliostigma, sahel : + yields & + stability + wue, + water + nutrients bright et al. 2017 © w es ta fr ic an p la n ts k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u challenges for implementation? k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n …

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présentation powerpoint k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c . c h en u soil carbon: key to address vulnerabilities of agriculture to climate change and food security issues claire chenu agroparistech – inra, grignon, france claire.chenu@inra.fr- chenu@agroparistech.fr mailto:ccaire.chenu@inra.fr- k o ro n iv ia j o in t w o rk o n a gr ic u lt u re w o rk sh o p - 2 0 1 9 -0 6 -1 8 - b o n n - c …

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