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Soils: Foundations of Fertility 土壤:肥沃的基础
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.008
N. Owen‐Smith
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引用次数: 0
The Physical Cradle: Land Forms, Geology, Climate, Hydrology and Soils 物理摇篮:地形、地质、气候、水文和土壤
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.003
N. Owen‐Smith
{"title":"The Physical Cradle: Land Forms, Geology, Climate, Hydrology and Soils","authors":"N. Owen‐Smith","doi":"10.1017/9781108961646.003","DOIUrl":"https://doi.org/10.1017/9781108961646.003","url":null,"abstract":"Africa emerged from the middle of the supercontinent called Gondwana, splitting from the land masses that became South America, Australia, India and Antarctica (Figure I.1). The rupture was initiated by massive outpourings of flood basalts, which commenced 183 million years ago (Ma) during the early Jurassic period in what is now southern Mozambique. The volcanic overlay spread inland from there at least as far as south-western Zambia. By 160 Ma, a widening trough separated Africa from eastern Antarctica and Madagascar, filled by the proto-Indian Ocean. In the west, the separation of South America from Africa began with lava eruptions in what is now Namibia, initiated around 123 Ma, and the South Atlantic Ocean began opening. Unencumbered by adjoining land masses, Africa drifted slowly northward, and rotated a little anticlockwise. The location of the equator shifted from the southern Sahara region towards its current middle position, with similar portions of the continent to its north and south. Once the continents eventually halted their drift, South America lay almost 3000 km from the nearest point of Africa, while Australia ended up almost 10,000 km distant on the other side of the Indian Ocean. The Tethys Sea separated Africa from Europe. Following its parting from the other southern continents, Africa’s highlying land surface became progressively worn down by erosion, lowering the hilltops and filling in the valleys. By 66 Ma, when the Cretaceous period ended with the demise of the dinosaurs, a gently undulating plain had been formed over most of the continent. This is known as the African erosion surface. The only mountain ranges lay in the far south and far north. The Cape Fold Mountains were formed during the Permian ~250 Ma, when Africa’s land mass pressed against Antarctica, while the Atlas Range was formed much later where Africa’s drift northward butted against Eurasia. Freed from the adjoining land masses, Africa’s coastal margins tilted upward. With the passage of time, the coastal escarpments became eroded back by as much as 200 km in the east and 50 km in the west. Material removed from the high country accumulated in the Kalahari, Congo and Chad basins and extended shorelines especially in the east and south. Through the interior, low hills emerged where more resistant rocks intruded. Africa’s surface probably resembled Australia, worn down and","PeriodicalId":243793,"journal":{"name":"Only in Africa","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127680177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Scientific Names of Extant Animal and Plant Species Mentioned in the Book Chapters (Ecologically Conservative with Regard to Species Recognition) 书中各章节提及的现存动植物物种学名(物种识别方面的生态保守)
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.030
N. Owen‐Smith
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引用次数: 0
How Trees and Grasses Grow and Compete 树和草是如何生长和竞争的
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.012
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引用次数: 0
Herbivore Abundance: Bottom-up and Top-down Influences 草食动物丰度:自下而上和自上而下的影响
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.019
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引用次数: 0
Climate: Rainfall Seasonality 气候:季节性降雨
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.005
N. Owen‐Smith
{"title":"Climate: Rainfall Seasonality","authors":"N. Owen‐Smith","doi":"10.1017/9781108961646.005","DOIUrl":"https://doi.org/10.1017/9781108961646.005","url":null,"abstract":"","PeriodicalId":243793,"journal":{"name":"Only in Africa","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122433328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Forms of Savanna: From Woodland to Grassland 稀树草原的形态:从林地到草原
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.011
N. Owen‐Smith
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引用次数: 0
Big Fierce Carnivores: Hunting Versus Scavenging 大型凶猛食肉动物:狩猎vs食腐
Only in Africa Pub Date : 2021-09-30 DOI: 10.1017/9781108961646.018
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引用次数: 0
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