Conceptual models of deforestation impact on precipitation - Avissar et al., 2002 Evidences of changes in rainfall caused by deforestation Carey et al.

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Presentation transcript:

Conceptual models of deforestation impact on precipitation - Avissar et al., 2002 Evidences of changes in rainfall caused by deforestation Carey et al 2001

Soil erosion and water regulation

Fire-sensitive ecosystem Old agricultural terraces colonised by pine forest Unburned: Very low sediment yield, rainfall amount dependent Burned: High sediment yield was plant cover dependent. Degradative dynamics changed from 50% cover. CEAM

Loss of plant cover, soil water infiltration and soil moisture Soil erosion Increased water scarcity Drought Land degradation DESERTIFICATION Improvement of water availability is necessary to restore desertified lands

STRATEGIES FOR POST-FIRE & DEGRADED LAND REHABILITATION CEAM

Limestones: Marls: Pinus halepensis 78 Age (Months) % Survival Quercus ilex ssp ballota PLANTATIONS (1992) 78 Age (Months) CEAM

LENGTH OF DRY PERIOD % MORTALITY Pinus halepensisQuercus cocciferaQuercus ilex ssp. ballota THE DROUGHT CEAM

Improving plant survival Overcoming plantation shock CEAM

Pistacia lentiscusArbutus unedo Rhamnus alaternus The role of diversity

OPTIONS …. Species diversification, ecotypes, genotypes, manipulating species plasticity Micro-habitat conditioners Soil preparation and amendment (threshold limit for most woody species in our drylands: 40 cm soil depth) managing plant-plant interactions In order to: Overcome transplanting shock Survive dry spells Grow during wet spells CEAM

PLANT QUALITY CEAM

Quercus species CEAM

cm WC - + Soil profile CEAM

cm WC - +  deeper soil exploration by roots  higher root biomass at cm  access to moist soil layers in summer Soil profile