Lecture VII. Biomes: Kinds Of Ecosystem. BiomEs.
Kinds Of Ecosystem
1.Cool Deserts - These are dominated by sagebrush, rabbitbrush and smallerperenial plants.
2.Hot Deserts– these are dominated by creosote, cacti, acacias, agave, and yucca.
Grasslands are dominated by grasses, and a richarray of deep-prooted, beautifullyflowering non grasses species. They have a few treesbecause of inadequate and freuentgrassfirethatkillswoodyseedlings.
Forest are regionswheretreesgrow as a result of adequatetemperature and minimal precipitation of 75 centimeters or more.
1. Tropical Rainforest – the forestwithhigh, fairly constant rainfall and temperaurethat permit trees to growthroughout the year. Annualrainfallmayexceed 400 cm. This is the biome with the highestspecisdiversity. The number of species in a given area may have almost 100 differentspecies per hectare.
3. Tropical savannaconsist of grasslanddottedwithscatteredsmalltrees and shrubssuch as acacias. Somesavannas are entirelygrassland; otherscontainmanytrees.
4. Tropical thornwood, shrubland and tropical shrub. The proportion of treesdepends on the competitionbetweentrees and grasses for water. The oilis more fertile thanmost tropical rainforest, but the rainfalliserratic.
The term “taiga” comes from the russian word meaning “primeval forest”. It is also known as boreal forest. It is dominated by conifers that can survive extreme cold in winter. The trees in taiga are further apart than in he forest and enough sunlight penetrates the forest floor to support an extensive ground cover for the shrubs. Most taiga precipitations are snow.
The tundra is a treeless biome that occurs far north in the Arctic regions where winters are too dry and cold to permit the growth of trees.