i GEOREFERENCED DATA ON SOC CONTENTS UNDER SUGARCANE CROPS

Agricultural sails can play a crucial role in Sail Organic Carbon (SOC) sequestratian accarding ta the '4 per 1000' initiative

As h1gh carbon content soils. tropical volcanic soils of Reunion 1sland h1ghlight the importance of

"carbon hotspots" to study s01I organic carbon (SOC) sequestrat1on 1n order to face the challenges of chmate change and food secunty

i GEOREFERENCED DATA ON SOC CONTENTS UNDER SUGARCANE CROPS

A LARGE SOIL ANALYSIS DATABASE : more than 20 000 soil samples from sugarcane plots analysed since 1993 SPAT\AL ANALYSIS

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DATA MLN!NG ANALYSIS

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Soil type

Cllmate

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Boosted Reqression Tree ol SOC content onde< suga,:çane aoos

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.. Soil type, the main driver of SOC content A volcanic rock weathering gradient.

from Andosols to Ferralsols l

i ^DYNAMICS OF SOC CONTENTS IN VOLCANIC SOILS UNDER SUGARCANE CROPS

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Long-term series, built over the tast 20 years showed constant SOC contents under sugarcane crops on the whole range of soils

Andk cambisol

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.. Stabillty o( soc�

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High organic carbon INPUTS to the soil combined

� with conservative agricultural practices

1 TIUAGEONLY..,, � OIi G.., SUR 1 •

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soc Saturation reached in soi undar � creps?

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Preliminary results showed h1gher SOC stocks und«

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sugarcane crops than ln pineapple and marl<et gardf'flinsl,

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' ,. Sugarcane crops wlth conMNatlve agncultural �ctlces con .. rve the hlgh SOC stoci<s of �le soUs on Reunèon , ,. But these "carbon hot$pots solls" are sttll VULNERABLE TO LANDUSE CHANGE

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