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Couverture2 rapp - Observatoire du Sahara et du Sahel

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Recouvrement en %<br />

Recouvrement en %<br />

1 0 0<br />

Recouvrement<br />

8 0<br />

6 0<br />

4 0<br />

2 0<br />

0<br />

1 0 0<br />

8 0<br />

6 0<br />

4 0<br />

2 0<br />

0<br />

1 0 0<br />

8 0<br />

6 0<br />

4 0<br />

2 0<br />

0<br />

a : r e c o u v r e m e n t g lo b a l d e la v é g é t a t io n<br />

N H<br />

C H<br />

S H<br />

2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5<br />

A n n é e s<br />

b : r e c o u v r e m e n t d e l a s t r a t e h e r b a c é e<br />

N H<br />

C H<br />

S H<br />

2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5<br />

A n n é e s<br />

c : s o l n u<br />

2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5<br />

A n n é e s<br />

Figure 24 : Variation sur 4 ans des recouvrements de la végétation <strong>et</strong> de la fréquence <strong>du</strong> sol nu en fonction<br />

des zones écologiques dans l’observatoire de Bourem<br />

N H<br />

C H<br />

S H<br />

22

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