تويت
Adansonia digitata,
the African baobab,
الباوباب الأفريقي ، هو أكثر أنواع الأشجار انتشارًا من جنس Adansonia ، الباوباب ، وهو موطنه القارة الأفريقية وجنوب شبه الجزيرة العربية (اليمن ، عمان).
هذه هي pachycauls طويلة العمر. أظهر التأريخ بالكربون المشع أن عمر بعض الأفراد يزيد عن 2000 عام.
توجد عادة في السافانا الجافة والحارة في أفريقيا جنوب الصحراء الكبرى ، حيث تهيمن على المناظر الطبيعية وتكشف عن وجود مجرى مائي من بعيد.
لقد تم تقديرها تقليديًا كمصادر للغذاء أو الماء أو العلاجات الصحية أو أماكن المأوى وهي مصدر غذاء رئيسي للعديد من الحيوانات
is the most widespread tree species of the genus Adansonia, the baobabs, and is native to the African continent and the southern Arabian Peninsula (Yemen, Oman).
These are long-lived pachycauls; radiocarbon dating has shown some individuals to be over 2,000 years old.
They are typically found in dry, hot savannas of sub-Saharan Africa, where they dominate the landscape and reveal the presence of a watercourse from afar.
They have traditionally been valued as sources of food, water, health remedies or places of shelter and are a key food source for many animals.
They are steeped in legend and superstition. In recent years, many of the largest, oldest trees have died, possibly due to climate change.
Common names for the baobab include monkey-bread tree, upside-down tree, and cream of tartar tree.
African baobabs are trees that often grow as solitary individuals, and are large and distinctive elements of savanna or scrubland vegetation.
They grow from 5–25 metres tall.
The trunk is typically very broad and fluted or cylindrical, often with a buttressed, spreading base.
Trunks may reach a diameter of 10–14 m), and may be made up of multiple stems fused around a hollow core.
The hollow core found in many tree species is the result of wood removal, such as decay of the oldest, internal part of the trunk.
In baobabs, however, many of the largest and oldest of the trees have a hollow core that is the result of a fused circle of three to eight stems sprouting from roots.
The bark is gray and usually smooth.
The main branches can be massive.
All baobabs are deciduous, losing their leaves in the dry season, and remaining leafless for about eight months of the year.
Flowers are large, white and hanging. Fruits are rounded with a thick shell.
The leaves are palmately compound with 5 to 7 (sometimes up to 9) leaflets in mature trees, but seedlings and regenerating shoots may have simple leaves.
The transition to compound leaves comes with age and may be gradual.
African baobabs produce simple leaves much longer than most other Adansonia species.
Leaflets are stalkless (sessile) to short-stalked and size is variable.
Flowering occurs in both the dry and the wet season.
Buds are rounded with a cone-shaped tip.
Flowers are showy and sometimes paired, but usually produced singly at the end of a hanging stalk about 15–90 centimetres in length.
Water storage
Baobab trees store water in their trunks and branches on a seasonal basis as they live in areas of sustained drought and water inaccessibility.
The spongy material of the bark allows water to be absorbed deeper into the tissue, as there is rarely enough rain during the wet season to penetrate the litter layer of soil.
The U-shaped branches allow for water to trickle down, allowing for maximum absorption over an extended period of time even after the rain stops.
The water is absorbed into the vascular tissue of the tree, where it can be moved into the tree's parenchyma cells for long-term storage, or used.
A large Baobab can store as much as 136,400 liters of water.
During the dry season, the trees will flush out all of their leaves.
During this period, the circumference of the trunk will shrink about 2–3 cm and the water content of the stem will drop by about 10%.
Dropping leaves during the dry season is done to prevent water loss through transpiration out of the stomata, which would cause the water potentials in the vascular tissue to drop too low and pull water out of the vacuoles in the parenchyma cells.
This would lead to the parenchyma cells, which make up the majority of the trunk and branches, to plasmolyze destroying the tree.
the African baobab,
الباوباب الأفريقي ، هو أكثر أنواع الأشجار انتشارًا من جنس Adansonia ، الباوباب ، وهو موطنه القارة الأفريقية وجنوب شبه الجزيرة العربية (اليمن ، عمان).
هذه هي pachycauls طويلة العمر. أظهر التأريخ بالكربون المشع أن عمر بعض الأفراد يزيد عن 2000 عام.
توجد عادة في السافانا الجافة والحارة في أفريقيا جنوب الصحراء الكبرى ، حيث تهيمن على المناظر الطبيعية وتكشف عن وجود مجرى مائي من بعيد.
لقد تم تقديرها تقليديًا كمصادر للغذاء أو الماء أو العلاجات الصحية أو أماكن المأوى وهي مصدر غذاء رئيسي للعديد من الحيوانات
is the most widespread tree species of the genus Adansonia, the baobabs, and is native to the African continent and the southern Arabian Peninsula (Yemen, Oman).
These are long-lived pachycauls; radiocarbon dating has shown some individuals to be over 2,000 years old.
They are typically found in dry, hot savannas of sub-Saharan Africa, where they dominate the landscape and reveal the presence of a watercourse from afar.
They have traditionally been valued as sources of food, water, health remedies or places of shelter and are a key food source for many animals.
They are steeped in legend and superstition. In recent years, many of the largest, oldest trees have died, possibly due to climate change.
Common names for the baobab include monkey-bread tree, upside-down tree, and cream of tartar tree.
African baobabs are trees that often grow as solitary individuals, and are large and distinctive elements of savanna or scrubland vegetation.
They grow from 5–25 metres tall.
The trunk is typically very broad and fluted or cylindrical, often with a buttressed, spreading base.
Trunks may reach a diameter of 10–14 m), and may be made up of multiple stems fused around a hollow core.
The hollow core found in many tree species is the result of wood removal, such as decay of the oldest, internal part of the trunk.
In baobabs, however, many of the largest and oldest of the trees have a hollow core that is the result of a fused circle of three to eight stems sprouting from roots.
The bark is gray and usually smooth.
The main branches can be massive.
All baobabs are deciduous, losing their leaves in the dry season, and remaining leafless for about eight months of the year.
Flowers are large, white and hanging. Fruits are rounded with a thick shell.
The leaves are palmately compound with 5 to 7 (sometimes up to 9) leaflets in mature trees, but seedlings and regenerating shoots may have simple leaves.
The transition to compound leaves comes with age and may be gradual.
African baobabs produce simple leaves much longer than most other Adansonia species.
Leaflets are stalkless (sessile) to short-stalked and size is variable.
Flowering occurs in both the dry and the wet season.
Buds are rounded with a cone-shaped tip.
Flowers are showy and sometimes paired, but usually produced singly at the end of a hanging stalk about 15–90 centimetres in length.
Water storage
Baobab trees store water in their trunks and branches on a seasonal basis as they live in areas of sustained drought and water inaccessibility.
The spongy material of the bark allows water to be absorbed deeper into the tissue, as there is rarely enough rain during the wet season to penetrate the litter layer of soil.
The U-shaped branches allow for water to trickle down, allowing for maximum absorption over an extended period of time even after the rain stops.
The water is absorbed into the vascular tissue of the tree, where it can be moved into the tree's parenchyma cells for long-term storage, or used.
A large Baobab can store as much as 136,400 liters of water.
During the dry season, the trees will flush out all of their leaves.
During this period, the circumference of the trunk will shrink about 2–3 cm and the water content of the stem will drop by about 10%.
Dropping leaves during the dry season is done to prevent water loss through transpiration out of the stomata, which would cause the water potentials in the vascular tissue to drop too low and pull water out of the vacuoles in the parenchyma cells.
This would lead to the parenchyma cells, which make up the majority of the trunk and branches, to plasmolyze destroying the tree.