les facteurs édaphiques svt شرح بالعربية

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les facteurs édaphiques : العوامل التربوية • شرح بالعربية لجميع دروس مادة علوم الحياة والأرض • Bonjours mes élèves, aujourd'hui on se retrouve dans cette nouvelle vidéo d'unité 1 écologie, chapitre : les facteurs édaphiques et leur relation avec les êtres vivants. • Pr : Ayyoub Lamsaf • les facteurs édaphiques et leur influencent sur la répartition des êtres vivants. • Les facteurs édaphiques ou pédologiques sont des facteurs écologiques liés aux caractéristiques physiques et chimiques du sol. Il s'agit de la texture, de la structure, de la porosité, de la teneur en eau, du degré d'acidité et de la teneur en éléments minéraux du sol. Ces facteurs ont une influence particulièrement grande sur les végétaux. Selon la pédologie, le sol comporte des constituants minéraux provenant de la désagrégation de la roche mère (roche située à la surface de la croûte terrestre) par l'effet combiné des facteurs climatiques et biologiques et des constituants organiques dérivant des êtres vivants (humus). • Les principaux constituants du sol sont de quatre types : constituants organiques (débris d'organismes végétaux par exemple), constituants minéraux (sable, argile…), des gaz qui circulent dans les interstices du sol, et enfin la solution du sol , formée d'eau et d'ions. A partir de là, un sol va avoir différentes caractéristiques que l'on peut déterminer en effectuant des analyses 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