Climatic zone of variable humid forests. Types of flora_geobotany. Tropical deserts and semi-deserts

The subequatorial climatic zone is transitional and occurs in the northern and southern hemispheres, from to tropical zones.

Climate

In summer, in the zones of the subequatorial zone, the monsoon type of climate prevails, which is characterized by a large amount of precipitation. Its characteristic feature is the change air masses from equatorial to tropical, depending on the season. In winter, dry trade winds are observed here.

The average monthly temperature varies between 15-32º C, and the amount of precipitation is 250-2000 mm.

The rainy season is characterized by high rainfall (almost 95% per annum) and lasts about 2-3 months. When easterly tropical winds prevail, the climate becomes arid.

Countries of the subequatorial belt

The subequatorial climatic zone passes through the countries of: South Asia (the Hindustan Peninsula: India, Bangladesh and the island of Sri Lanka); Southeast Asia (Indochina peninsula: Myanmar, Laos, Thailand, Cambodia, Vietnam, Philippines); southern part of North America: Costa Rica, Panama; South America: Ecuador, Brazil, Bolivia, Peru, Colombia, Venezuela, Guyana, Suriname, Guiana; Africa: Senegal, Mali, Guinea, Liberia, Sierra Leone, Ivory Coast, Ghana, Burkina Faso, Togo, Benin, Niger, Nigeria, Chad, Sudan, Central African Republic, Ethiopia, Somalia, Kenya, Uganda, Tanzania , Burundi, Tanzania, Mozambique, Malawi, Zimbabwe, Zambia, Angola, Congo, DRC, Gabon, and the island of Madagascar; Northern Oceania: Australia.

Natural zones of the subequatorial belt

Map of natural zones and climatic zones of the world

The subequatorial climatic zone includes the following natural zones:

  • savannas and woodlands (South America, Africa, Asia, Oceania);

And light forests are predominantly found in the subequatorial climatic zone.

Savannas are a mixed grassland. The trees here grow more measuredly than in the forests. However, despite the high density of trees, there are open spaces covered with grassy vegetation. Savannahs cover about 20% of the Earth's land area and are often located in transition zone between forests and deserts or pastures.

  • altitudinal zones (South America, Africa, Asia);

This natural zone is located in mountainous areas and is characterized by climate change, namely, a decrease in air temperature by 5-6 ° C as the height above sea level rises. In areas of altitudinal zonality, there is a smaller amount of oxygen and a reduced Atmosphere pressure and increased ultraviolet radiation.

  • variable-moist (including monsoon) forests (South America, North America, Asia, Africa);

Variably humid forests, along with savannahs and light forests, are predominantly found in the subequatorial zone. The plant world is not distinguished by a wide variety of species, unlike wet equatorial forests. Since there are two seasons in this climatic zone (dry and rainy), the trees have adapted to these changes and for the most part they are represented by broad-leaved deciduous species.

  • humid equatorial forests (Oceania, Philippines).

In the subequatorial zone, moist equatorial forests are not as common as in the equatorial zone. They are characterized by a complex structure of the forest, as well as a wide variety of flora, which is represented by evergreen tree species and other vegetation.

Soils of the subequatorial belt

This belt is dominated by red soils of variable rainforests and tall grass savannahs. They are characterized by a reddish tint, granular structure, low humus content (2-4%). This type of soil is rich in iron and has negligible silicon content. Potassium, sodium, calcium and magnesium are found here in negligible amounts.

Mountain yellow earth, red earth and lateritic soils are common in Southeast Asia. In South Asia and central Africa, black soils of dry tropical savannas are found.

Animals and plants

The subequatorial climate zone is home to fast-growing trees, including balsa trees and members of the genus Cecropia, as well as trees that grow longer (more than 100 years), such as svitaniya and different kinds entandrophragm. Gaboon redwoods are common in tropical rainforests. Here you can find baobab, acacia, various types of palm, spurge and parkia, as well as many other plants.

The subequatorial climatic zone is characterized by a variety of fauna, especially birds (woodpeckers, toucans, parrots, etc.) and insects (ants, butterflies, termites). However, there are not many terrestrial species, these include.

Introduction

Eurasia is the largest continent on Earth, the area is 53,893 thousand square kilometers, which is 36% of the land area. The population is over 4.8 billion people.

The continent is located in the Northern Hemisphere between approximately 9° and 169° west longitude, with part of the Eurasian islands located in southern hemisphere. Most of continental Eurasia lies in the Eastern Hemisphere, although the extreme western and eastern ends of the mainland are in the Western Hemisphere. Contains two parts of the world: Europe and Asia.

All climatic zones and natural zones are represented in Eurasia.

Natural zone - part of a geographical zone with homogeneous climatic conditions.

natural areas take their name from the vegetation inherent in them, and other geographical features. The zones regularly change from the equator to the poles and from the oceans deep into the continents; have similar temperature and moisture conditions, which determine homogeneous soils, vegetation, animal world and other components of the natural environment. Natural zones are one of the stages of physical and geographical zoning.

The main natural zones of the subequatorial and equatorial belts of Eurasia considered in the course work are the zone of variable humid, including monsoon forests, the zone of savannas and light forests, the zone of equatorial forests.

A zone of variable humid, monsoon forests develops on the plains of Hindustan, Indochina and in the northern half of the Philippine Islands, a zone of savannahs and woodlands - on the Deccan Plateau and the interior of the Indochina Peninsula, humid equatorial forests - throughout the Malay Archipelago, the southern half of the Philippine Islands, the southwest Ceylon and the Malay Peninsula.

The course work gives a detailed description of these natural areas, reflects the geographical location, climate, soil, vegetable world his ecological features, animal population and its ecological features. Also developed actual topic- environmental problems of the equatorial and subequatorial belts of Eurasia. First of all, these include the deforestation of moist equatorial forests and the desertification of savannahs under the influence of grazing.

Zone of variable humid, including monsoon forests

Geographical location, natural conditions

In the subequatorial belt, due to seasonal precipitation and uneven distribution of precipitation over the territory, as well as contrasts in annual course temperatures, on the plains of Hindustan, Indochina and in the northern half of the Philippine Islands, landscapes of subequatorial moist forests.

Variably humid forests occupy the wettest areas of the lower reaches of the Ganges-Brahmaputra, coastal regions of Indochina and the Philippine archipelago, are especially well developed in Thailand, Burma, the Malay Peninsula, where at least 1500 millimeters of precipitation falls. On drier plains and plateaus, where the amount of precipitation does not exceed 1000-800 millimeters, seasonally moist monsoon forests grow, which once covered large areas of the Hindustan peninsula and southern Indochina (Korat Plateau). With a decrease in precipitation to 800-600 millimeters and a reduction in the rainfall period from 200 to 150-100 days a year, forests are replaced by savannahs, woodlands and shrubs.

The soils here are ferralitic, but predominantly red. With a decrease in the amount of rain, the concentration of humus in them increases. They are formed as a result of ferralitic weathering (the process is accompanied by the decay of most of the primary minerals, with the exception of quartz, and the accumulation of secondary ones - kaolinite, goethite, gibbsite, etc.) and humus accumulation under the forest vegetation of the humid tropics. They are characterized by low content of silica, high content of aluminum and iron, low cation exchange and high anion absorption capacity, predominantly red and variegated yellow-red color of the soil profile, very acidic reaction. Humus contains mainly fulvic acids. Humus contain 8-10%.

The hydrothermal regime of seasonally humid tropical communities is constantly characterized by high temperatures and a sharp change in the wet and dry seasons, which determines the specific features of the structure and dynamics of their fauna and animal population, which markedly distinguish them from communities of tropical rainforests. First of all, the presence of a dry season lasting from two to five months determines the seasonal rhythm of life processes in almost all animal species. This rhythm is expressed in the confinement of the breeding period mainly to the wet season, in the complete or partial cessation of activity during the drought, in the migratory movements of animals both within the biome under consideration and outside it during the unfavorable dry season. Falling into full or partial anabiosis is characteristic of many terrestrial and soil invertebrates, for amphibians, and migration is characteristic of some insects capable of flight (for example, locusts), birds, bats and large ungulates.

Variably humid forests. The zone of variable humid (including monsoon) forests extends in the east and south of Eurasia. The vegetation here is represented by both coniferous and deciduous trees (cedar, pine, oak, walnut, gingko) and evergreen trees (palms, ficuses, bamboo and magnolias), which grow mainly on red-yellow soils. The fauna is also characterized by a significant species diversity: monkeys, tigers, leopards, as well as endemics - a bamboo bear (panda), a gibbon, etc.

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For tropical wet evergreens, or as they are sometimes called, rainforests are characterized by a three-tier structure of the tree canopy. The tiers are poorly demarcated. The upper tier consists of giant trees 45 m or more in height, 2-2.5 m in diameter. The middle tier is represented by trees about 30 m high with a trunk diameter of up to 90 cm. Smaller, exceptionally shade-tolerant trees grow in the third tier. There are many palm trees in these forests. The main area of ​​\u200b\u200btheir growth is the Amazon basin. Here they occupy vast areas, including, in addition to the northern part of Brazil, French Guiana, Suriname, Guyana, the southern part of Venezuela, the west and south of Colombia, Ecuador and the east of Peru. In addition, this type of forest is found in Brazil in a narrow strip along the Atlantic coast between 5 and 30°S. Similar evergreen forests also grow along the Pacific coast from the border of Panama to Guayaquil in Ecuador. Here are concentrated all types of the genus Svitania (or mahogany), rubber-bearing genus Hevea, Brazil nut (Bertolletia excelsa) and many other valuable species.

Tropical variable-humid deciduous forests distributed in the southeast of Brazil and in the south of Paraguay. Tree species in them are relatively small in height, but often with thick trunks. Legumes are widely represented in the forests. Subtropical deciduous broadleaf forests most common in the south of Brazil and Parguay, in the west of Uruguay and in the north of Argentina along the Parana and Uruguay rivers. montane evergreen forests cover the slopes of the Andes from Venezuela to central Bolivia. These forests are characterized by thin-stemmed low trees forming dense stands. Due to the fact that these forests occupy steep slopes and are far from populated areas, they are exploited very little.

Araucaria forests located in two isolated regions. Brazilian Araucaria (Araucaria brasiliana) is predominant in the states of Parana, Santa Catarina and Rio Grande do Sul in Brazil, as well as in Uruguay, Eastern Paraguay and Argentina. A less significant massif is formed by forests of Chilean araucaria (A. araucana) found in the Andes at 40°S. in the altitude range from 500 to 3000 m above sea level. seas. These forests are characterized by hardwood species, among which the most important is embuya (Phoebe porosa). In the undergrowth of the araucaria forests, the mate shrub, or Paraguayan tea (Ilex paraguariensis), is also widespread on plantations.

Low growing xerophilous forests distributed in the east of Brazil, in the northern part of Argentina and in the western part of Paraguay. The most important tree species in these forests is the red querbacho (Schinopsis sp.), from which tannin is obtained. mangrove forests occupy the coastal strip of the Atlantic part of South America. These forests are dominated by red mangrove (Rhizophora mangle), forming pure stands or mixed with Avicenna (Avicennia marina) and Conocarpus erecta.

In addition to timber harvesting, rubber is mined in the forests of the continent, food products(seeds, nuts, fruits, beans, leaves, etc.), oils, medicinal substances, tannins, resins, including chicle (Zschokkea lascescens), which goes to the USA as a raw material for the production of chewing gum.

Venezuela. Evergreen (on laterites) and deciduous forests grow on the slopes of the spurs of the Andes and the Guiana Highlands. On the territory of the low llanos, tall-grass savannah with groves of the Mauritian palm is widespread, and in the high llanos, xerophilic light forests and shrub communities are common. Mangroves stretch around Lake Maracaibo, giving way to undersized xerophilous, and to the south - evergreen tropical forests. In the south of the country, in the upper reaches of the river. Orinoco and its right tributaries grow moist evergreen tropical forests, almost inaccessible to exploitation. Of the tree species of economic value, mahogany, roble colorado, baku, balsa, espave (Anacardium spp.), angelino (Ocotea caracasana), oleo-vermelho (Myroxylon balsamum), pao-roxo, guaiacum, tabebuya (Tabebuia pentaphylla ), ceiba (Ceiba pentandra), almasigo (Bursera simaruba), kurbaril (Hymenaea courbaril), adobe (Samanea saman), etc.


Landscape in the center of Venezuela

Colombia. According to natural conditions, two regions are distinguished: the eastern (plain) and the western (mountainous, where the Colombian Andes stretch). The first region is largely occupied by humid evergreen forests of the Magdalena basins and the left tributaries of the Amazon. In the north of the Guajira peninsula and west of it, along the coast caribbean, low-growing xerophilous forests extend, in which divi-divi beans (Libidibia coriaria) are harvested for tannin. Guaiac wood (Guaiacum spp.) is also harvested here - this is one of the hardest and heaviest woods in the world, used for the manufacture of rollers, blocks and other engineering products.

Mangrove forests stretch along the Pacific and Caribbean coasts. In evergreen tropical hylaea, especially in the lower part of the Magdalena basin and along the mouth of the river. Atrato, kativo wood (Prioria copaifera) is harvested for export, as well as baku, or "Colombian mahogany" (Cariniana spp.), caoba, or real mahogany (Swietenia macrophylla), roble colorado, or Panamanian mahogany (Platymiscium spp.) , purple tree, or paoroxo (Peltogyne spp.), etc. In the eastern part of the elevated plain along the tributaries of the Orinoco, savanna-llanos with rare trees and gallery forests with Mauritius palm (Mauricia sp.) are common. The forests of the mountain regions of the Andes are characterized by a peculiar altitudinal zonality. On the lower parts of the lee slopes and on the northern ridges, deciduous forests or thorny shrubs are common. In the adjacent part of the mountains (from 1000 to 2000 m) mountain broad-leaved evergreen forests grow with tree ferns, wax palm (Copernicia cerifera), cinchona, coca (Erythroxylon coca) and various orchids. Cultivated crops include cocoa and coffee trees. At an altitude of 2000 to 3200 m, humid alpine hylaea, in which there are many species of evergreen oaks, shrubs and bamboos.

Ecuador. Three natural areas are distinguished on the territory of the country: 1) a watershed plateau with wet equatorial forests - hylaea, or selva(together with the upper reaches of the left tributaries of the Amazon); 2) Andes ranges; 3) the Pacific forest-savannah plain and the western slopes of the Andes. The evergreen tropical forests of the first region are poorly studied and difficult to access. On the western slopes of the Andes, up to a height of 3000 m, evergreen mountain broad-leaved forests (hylaea) grow, largely disturbed by slash-and-burn agriculture. They produce a lot of cinchona bark, as well as balsa, kapok from the fruits of ceiba, leaves of the toquilla palm, or hipihapa (Carludovica palmata), used to make Panama hats. Tagua palm (Phytelephas spp.) is also found here, the hard endosperm of the fruits of which is used to produce buttons, and various rubber plants. The lower part of the western slopes is characterized by evergreen tropical forests. In the river valley Guayas is intensively harvested for export balsa wood.

Guyana, Suriname, Guiana. The forests of these countries, located along the coast of the Atlantic Ocean and along the Guiana Highlands, are evergreen tropical with a number of valuable species. The green tree, or betabaro (Ocotea rodiaei), which is exported in Guyana and Suriname, stands out in particular. Apomate (Tabebuia pentaphylla), canalette (Cordia spp.), pekia (Caryocar spp.), espave (Anacardium spp.), habillo (Hura crepitans), wallaba (Eperua spp.), carap (Carapa guianensis), virola are no less valuable. (Virola spp.), Simaruba (Simaruba spp.), etc.

Brazil. There are more than 7 thousand species of woody and shrubby plants in the flora, of which there are over 4.5 thousand species in the Amazonian selva. High bertholecia grow (giving brazil nuts, etc.), various rubber plants, including brazilian hevea, which has become a valuable plantation crop in many countries of South Asia and Africa, laurels, ficuses, brazilian mahogany, or "pau brazil", which gave the name to the country (Caesalpinia echinata), chocolate tree, or cocoa, mahogany, jacaranda, or rosewood, oleo vermelho, roble colorado and sapukaya, or paradise nut (Lecythis ustata), and many others. In the east, the selva turns into light palm forests, among which we note the valuable babasu palm (Orbignya speciosa), which has highly nutritious nuts. South of the Amazonian selva, landscapes of tropical dry woodlands are common - caatinga, in which trees grow that shed their leaves in the dry season and accumulate moisture in the rainy season, for example, the bottle tree (Cavanillesia arborea), thorny shrubs, cacti (Cereus squamulosus). In the floodplains, there is a carnauba, or wax, palm (Copernicia cerifera), from the leaves of which wax is collected, which is used in technology. From the south, subtropical deciduous forests adjoin forests dominated by palms and savannahs. In the southeast of the country, along the Brazilian Highlands, there are araucaria forests from the Brazilian, or Paran, araucaria (pinheiro, or "Brazilian pine"). Along with it, embuya, tabebuya, cordia grow, and in the undergrowth of yerbamate, Paraguayan tea is prepared from its leaves. Araucaria forests are involved in intensive exploitation.

Along the Atlantic coast and at the mouth of the Amazon, mangrove forests grow, dominated by red mangrove with an admixture of black mangrove (Avicennia marina) and white mangrove (Conocarpus erecta). Tannin is extracted from the bark of these trees.

Road from Calama (Chile) to LaPaz (Bolivia)

Chile. The main forest area is concentrated in the southern half of the country along the Pacific slopes of the Andes. In the region of 41-42 ° S.l. there is a significant array of araucaria forests, dominated by pure stands of pinot, or Chilean araucaria, often called "Chilean pine" (Araucaria araucana). To the south are mixed broad-leaved deciduous forests. temperate zone with different species of southern beech (Nothofagus spp.), representatives of laurels - linge (Persea lingue), ulmo (Beilschmiedia berteroana). Found in the extreme south coniferous forests from alerse (Fitzroya cupressoides) and sypres (Pilgerodendron uviferum) with an admixture of canelo (Drimys winteri). The bark of the latter contains substances with antiscorbutic properties.

Argentina. There are several natural regions. The east is dominated by evergreen forests, in which more than 100 species of trees of great economic importance grow. Among them are cabreuva (Myrocarpus frondosus), kanzherana (Cabralea oblongifolia), Brazilian araucaria, tabebuya, etc. In the west, evergreen ice grows along the slopes of the Andes at an altitude of 2000-2500 m above sea level. seas. Palo blanco (Calycophyllum multiflorum), cedro-salteno (Cedrela balansae), roble-criolo (Amburana cearensis), nogal-criolo (Juglans australis), tarco (Jacaranda mimosifolia), type-blanco (Tipuana tipu), etc. In the south, along the slopes of the Andes, subantarctic vegetation extends, among which several species of southern beech, alerce, "Cordillera cypress" (Austrocedrus chilensis), etc., are distinguished. palosanto (Bulnesia sarmientoi), guaiacan (Caesalpinia paraguarensis), etc. To the south, along the eastern slopes of the Andes, there are xerophilic broad-leaved forests of the temperate zone with algarrobo, acacias (Acacia caven), carcass (Celtis spinosa), quebracho-blanco.

Paraguay. Forest cover 51%. In the east of the country, mixed tropical evergreen and deciduous forests are common, turning in the west (in the Gran Chaco region) into woodlands and savannahs. The main tree species is quebracho blanco (Aspidosperma quebracho-blanco).

Uruguay. Forests occupy an insignificant part of the total territory of the country and are located in the lower reaches of the Rio Negro and in the valley of the river. Uruguay. The forest cover of the country is 3%. Large areas are beginning to be occupied by artificial plantations - pines on coastal dunes and eucalyptus plantations.

Published according to the monograph: A.D. Bukshtynov, B.I. Groshev, G.V. Krylov. Forests (Nature of the world). M.: Thought, 1981. 316 p.

Monsoon forests are huge green areas with lush vegetation and rich wildlife. During the rainy season, they resemble equatorial evergreen forests. Found in subequatorial and tropical climates. They attract tourists and photographers with a variety of picturesque landscapes.

Description

Moist monsoon forests are most common in the tropics. Most often they are located at an altitude of 850 meters above sea level. They are also called deciduous due to the fact that the trees lose their foliage during the drought period. Heavy rains return them to their former juiciness and color. The trees here reach a height of twenty meters, the leaves on the crowns are small. Evergreen species, many lianas and epiphytes are common in the undergrowth. Orchids grow in the monsoon zone. They are found in the Brazilian coastal mountain ranges, the Himalayas, Malaysia, Mexico, Indochina.

Peculiarities

Monsoon forests in the Far East are famous for their variety of plants and animals. Warm and humid summers, an abundance of plant foods create favorable conditions for the habitat of insects, birds, and mammals. Coniferous and broad-leaved trees are found here. Among the inhabitants of the forests, sable, squirrel, chipmunk, hazel grouse, as well as animals rare for the climatic zone of Russia were noticed. Characteristic inhabitants of the monsoon forests are the Ussuri tiger, black bear, spotted deer, wolf, and raccoon dog. There are many wild boars, hares, moles, pheasants on the territory. reservoirs subequatorial climate rich in fish. Some species are protected.

Rare orchids grow in the humid forests of Brazil, Mexico, and Indochina. About sixty percent are sympodial species, well known among flower growers. The red-yellow soils of the monsoon territories are favorable for ficuses, palm trees, valuable tree species. The most famous include teak, satin, lard, iron. For example, it is able to form a dark grove from its trunks. A huge banyan tree grows in the Indian Botanical Garden, which has almost two thousand (!) Trunks. The crown of the tree covers an area of ​​twelve thousand square meters. Variably humid forests become a habitat for bamboo bears (pandas), salamanders, tigers, leopards, poisonous insects and snakes.

Climate

Which one dominates the monsoon forests? Winter here is mostly dry, summer is not hot, but warm. The dry season lasts three to four months. The average air temperature is lower than in the humid tropics: the absolute minimum is -25 degrees, the maximum is 35 with a "+" sign. The temperature difference is from eight to twelve degrees. Characteristic climate - prolonged heavy rains in summer and their absence in winter. The difference between the two opposite seasons is huge.

The monsoon forests are known for their morning mist and low clouds. That is why the air is so saturated with moisture. Already by noon, the bright sun completely evaporates moisture from the vegetation. In the afternoon, foggy haze forms again in the forests. High humidity and cloudiness persist for a long period of time. In winter, precipitation also falls, but rarely.

Geography

V subequatorial belt due to loss a large number rainfall and their uneven distribution, high temperature contrast, monsoon forests develop. On the territory of Russia, they grow in the Far East, have a complex terrain, rich flora and fauna. There are moist forests in Indochina, Hindustan, the Philippine Islands, Asia, North and South America, Africa. Despite the long rainy seasons and prolonged drought, the fauna in the monsoon forest zones is poorer than in the humid equatorial ones.

The monsoon phenomenon is most pronounced on the Indian continent, where a period of drought is replaced by heavy downpours, the duration of which can be seven months. Such a change in weather is typical for Indochina, Burma, Indonesia, Africa, Madagascar, northern and eastern Australia, and Oceania. For example, in Indochina and the Hindustan Peninsula, the dry period in the forests lasts seven months (from April to October). Trees with large crowns and an irregularly shaped vault grow in vast monsoon territories. Sometimes forests grow in tiers, which is especially noticeable from a height.

The soil

Monsoon moist soils are characterized by a red tint, a granular structure, and a low content of humus. The soil is rich in useful trace elements such as iron and silicon. Sodium, potassium, magnesium, calcium in moist soil is very small. On the territory of Southeast Asia, zheltozems and red soils predominate. Central Africa and are distinguished by dry chernozem. Interestingly, with the cessation of rain, the concentration of humus in monsoon forests increases. The reserve is one of the forms of protection wildlife in an area rich in valuable plants and animals. It is in humid forests that many species of orchids are found.

Plants and fauna

Monsoon forests in the subequatorial climate of Hindustan, China, Indochina, Australia, America, Africa, Far East(Russia) are characterized by a diversity of fauna. For example, teak trees, as well as Indochinese laurel and ebony are common in Southeast Asia in variable humid zones. There are also bamboo, creepers, butea, cereals. Many trees in the forests are highly valued for their healthy and durable wood. For example, teak bark is dense and resistant to destruction by termites and fungi. Sal forests grow at the southern foot of the Himalayas. In the monsoon regions of Central America there are many thorny bushes. It also grows in a humid climate and is a valuable Jat tree.

In the subequatorial climate, fast-growing trees are common. Palm trees, acacias, baobab, euphorbia, cecropium, entandrophragma, ferns predominate, there are many other types of plants and flowers. The humid climate zone is characterized by a wide variety of birds and insects. In the forests there are woodpeckers, parrots, toucans, butterflies. Among terrestrial animals, marsupials, elephants, various representatives of the cat family, freshwater, amphibians, frogs, snakes are found in monsoon woodlands. This world is truly bright and rich.

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