Kingdom Plantae

Kingdom Plantae contains nearly 300,000 different kinds of plants. They also place the macroscopic, multicellular brown algae (Division Phaeophyta) and red algae (Division Rhodophyta) in the Kingdom Plantae.Although this does not make it the largest kingdom, many might argue that it is the most important one.In the process known as "photosynthesis ", plants use the energy of the Sun to make food and oxygen. This complex chemical reaction provides nearly all the oxygen in Earth's atmosphere and all the food required by living things. Although some protists and bacteria are capable of performing photosynthesis, plants do most of the photosynthesis on Earth.

                 The ancestors of plants first appeared in the seas nearly 700 million years ago. Another 265 million years passed before the first plants appeared on land. These early land plants looked very different than the plants you're familiar with today. In fact, many of them didn't even have roots, stems, or leaves! Since then, plants have taken on a variety of forms and are found in most places on Earth.

General Characteristics
 

A. Contain chlorophylls a and b.
B. Cell walls made of cellulose.
C. Have tissues and organs (roots, stems and leaves).
 

 Evolution of Plants
A. Evidence that plants evolved from algae
1. Green algae and plants both have chloroplast with chlorophylls a and b
2. Both have cell walls made of cellulose.
3. Both form starch as stored glucose.
4. Both demonstrate alternation of generations

Problems with life on land
A. Dehydration
1. Adaptations
a) Roots, vascular tissue, cuticles and bark
B. Support
1. Adaptations
a) Stiffer, thick cell walls; wood
C. Distribution of gametes and/or spores
1. Adaptations
a) Water tight seeds and/or spores.
b) Spores lighter than air.

Classification of Plants

A. Phylum Bryophyta 

• Primitive
• Lack vascular tissue
• Lack true roots
• Mosses and liverworts (Hepatophyta)

B. Super Phylum Tracheophyta

• More advanced than Bryophytes
• Contain vascular tissue

C. Phylum Pterophyta 

• Reproduce by spores
• Leaves generally grow from underground stems
• Ferns and horse tails

D. Phylum Coniferophyta

• Produce naked seeds in cones
• Many are evergreens
• Produce soft wood
• Needle like leaves
• Redwoods, pines, cypress and junipers

E. Phylum Anthophyta

• Flowering plants
• Either herbaceous or hardwoods
• Most advanced of all plant forms

a) Class Monocotyldonae (Monocots)

• Seeds contain one cotyledon
• Leaves have parallel veins
• Flower parts are usually in multiples of 3
• Lack cambium
• In the stem, vascular bundles are scattered
• Generally wind pollinated
• All are herbaceous with a few exceptions

b) Class Dicotyledonae (Dicots)

• This class is now called Eudicotyledonae
• Seeds contain two cotyledons
• Leaves have netted veins
• Flower parts are usually in multiples of 4 or 5
• Have cambium
• Vascular bundles are arranged in a cylinder, in the stem.
• Generally pollinated by animals.

 Five kingdom classification

Taiga Biome:boreal forests

      Taiga Biome:boreal forests

        

              Taiga is the world's largest land biome, and makes up 29% of the world's forest cover. the largest areas are located in Russia and Canada. The taiga is the terrestrial biome with the lowest annual average temperatures after the tundra and permanent ice caps. Extreme winter minimums in the northern taiga are typically lower than those of the tundra. The lowest reliably recorded temperatures in the Northern Hemisphere were recorded in the taiga of northeastern Russia. 

               The growing season, when the vegetation in the taiga comes alive, is usually slightly longer than the climatic definition of summer as the plants of the boreal biome have a lower threshold to trigger growth. In Canada, Scandinavia and Finland, the growing season is often estimated by using the period of the year when the 24-hr average temperature is 5 °C or more. For the Taiga Plains in Canada, growing season varies from 80 to 150 days, and in the Taiga Shield from 100 to 140 days. Some sources claim 130 days growing season as typical for the taiga.Other sources mention that 50–100 frost-free days are characteristic. Data for locations in southwest Yukon gives 80–120 frost-free days. The closed canopy boreal forest in Kenozyorsky National Park near Plesetsk, Arkhangelsk Province, Russia, on average has 108 frost-free days.The longest growing season is found in the smaller areas with oceanic influences; in coastal areas of Scandinavia and Finland, the growing season of the closed boreal forest can be 145–180 days.

            Animals found in taiga include woodpeckers, hawks, moose, bear, weasel, lynx, fox, wolf, deer, hares, chipmunks, shrews, and bats. Mammals living in the boreal forests have all adapted in various ways to survive the long cold winters. Generally they have heavy fur coats and many hibernate through the winter.

Growthform Adaptations: The main reasons firs, sprucs and pines are the dominant trees in the boreal forest, and thus define the biome is because they are adapted to the extreme conditions brough about by the cold, including the winter-induced drought and the short growing season. The following are some of the main adaptations we found that trees in this zone have:

• Conical shape - promotes shedding of snow and prevents loss of branches.
• Needleleafs - narrow leaves reduce surface area through which water can be lost (transpired), especially in the winter when the frozen ground prevents plants from replenishing their water supply. The needles of boreal conifers also have thick waxy coatings--a waterproof cuticle--in which stomata are sunken and protected from drying winds.
• Evergreen habit - retention of foliage allows plants to photosynthesize as soon as temperatures permit in spring, rather than having to waste time in the short growing season merely growing leaves. [Note: Deciduous larch are dominant in areas underlain by nearly continuous permafrost and having a climate even too dry and cold for the waxy needles of spruce and fir.]
• Dark color - the dark green of spruce and fir needles helps the foliage absorb maximum heat from the sun and begin photosynthesis as early as possible.

Grassland biome

TROPICAL GRASSLANDS

           Tropical grasslands, or savannas, are also the homes of primates in Africa and Asia; no savanna-living primates exist in South America. Tropical grasslands comprise a mixture of trees and grasses, the proportion of trees to grass varying directly with the rainfall. Areas of high seasonal rainfall support single-story woodlands of tall trees, while lush grasses form the ground vegetation.

           Tropical grasslands, or savannas, lie north and south of tropical rain forests that are on the equator. Some areas beyond savannas are hot deserts. Other savannas may be lined with mountains, dense forests, and seas. South America is home to several large savannas. An example of one of these savannas is the llanos, which means plains, located in the Orinoco River basin. The llanos is north of the Amazon forests and is shared in areas of Columbia and Venezuela. It is the size of France or Texas. Another large tropical grassland can be found south of the Amazon forest in the Brazilian Highlands, called campos. Other South American grasslands can be found in southeast Venezuela and southern Guyana.

          The worlds largest savannas can be found in Africa. The savanna takes up almost half of the continent. It stretches from the Atlantic coast of West Africa to the east across Sudan, and then goes south through east Africa. From Mozambique the savanna heads west and goes through Zambia and Angola, back to the Atlantic Ocean (Lambert, 30). Other savannas can be found in India's great Deccan Plateau, and in Australia, north of central deserts.

TEMPERATE GRASSLANDS

         The temperate grasslands are located in the mid-latitudes on planet Earth. These include the Prairies of North America, Pampas of South America and the Steppes of Eurasia. The temperate grasslands are further divided on the basis of their general characteristics. The best example of this is the Prairie biome of North America. In semi-arid regions - which are typically characterized by growth of short grass, the Prairies are known as Short-grass Prairies, while the same in regions with high rainfall - typically characterized by growth of tall grass, they are known as Tall-grass Prairies. This is just one of the numerous lesser known attributes of this grassland biome.

         Temperate grasslands are a division of a larger biome grouping of grasslands that includes tropical savannas.  Both biome types are characterized by a dominance of grasses, yet temperate grasslands differ significantly from savannas.  First unlike savannas that can have trees and shrubs scattered throughout, temperate grasslands have trees and shrubs absent.  Temperate grasslands are also found in less tropical ecosystems and thus have a larger temperate fluctuation during the year.  Temperatures in temperate grasslands can vary tremendously which has a large impact on growing seasons.  Generally they also have less rainfall. 

Regional Expressions: Temperate Grasslands are found throughout the globe, generally in the interiors of the continents and north or south of the tropic of cancer/Capricorn.  The following are the major regional expressions of grasslands recognized around the globe.

• Veldts of South Africa
• Puszta of Hungary
• Pampas of Argentina/Uruguay
• Steppes of Russia / China
• Plains and Prairies of North America

Minor Expressions: There are smaller local expressions of grasslands as well.  These include the following:

• Australian Outback
• Minnesota Cedar Creek Region

       Biodiversity: Grasslands (temperate) are dominated by one or a few species of grasses while there are several hundred other types of grasses and non-woody flowering plants that while less abundant make up a vital part of the species composition. There are many types of grass species that are dominant species in their own region.  Each species of grass grows better with varying temperatures / rainfall / and soil conditions.  Grasses are dominant (instead of trees) because of fire, drought and grazing by large herbivores. 

       Drought: Drought plays a large role in keeping trees from taking over the grasslands.  Some years receive less rain than others, just as certain seasons receive significantly less rain than others.  Trees generally can not stand the lack of water as easily as grasses and thus grasses remain dominant.

       Fire: Fire plays a big role in this biome, preserving biodiversity and keeping trees from overtaking the grasses.  Lightning from large storms rolling over the grasslands ignites large grass-fires.  These fires help certain plants by germinating seeds, clearing ground cover to allow rare plants a chance and by nourishing the soil with freshly burnt vegetation.

         Soil: The soil of the temperate grasslands is deep and dark.  The upper layers are the most fertile because of the buildup of many layers of dead branching stems and roots.  This organic mater on the surface and in the dead roots provide a great degree of nourishment for the living plants.

         Rainfall: Rainfall is generally less in temperate grasslands than in tropical savannas, although drought usually plays less of a roll effecting biodiversity than it does in savannas.  Rain usually falls in temperate grasslands in the late spring and early summer.  There is an average of 20 – 35 inches of rainfall a year.  The amount of rainfall however determines the height of grasses in the grassland.  For north America, this rainfall gradient helps to divide the temperate grasslands into tall grass prairies (in wetter areas) and short grass steppes (in dryer habitats).

         Environmental concerns: There is a great concern for remaining grasslands in temperate regions.  Because the soil in these areas is incredibly rich and the land is flat and treeless, most of this biome has been turned into farms or ranches.  The result of this overuse and consumption of the grassland by agricultural practices is a fragmentation of once large tracks of grassland.  Fragmentation decreases biodiversity (Theory of Island Biogeography).  Plowing of grasslands, combined with wind has lead to huge dust storms, such as those which created the Great Dust Bowl in the American Depression of the mid 1920s.  Finally, in dryer areas, overgrazing and salt build-up from irrigation of the land have turned these areas into near-wastelands.

          Floral Diversity: The most common grasses include blue gamma grass, buffalo grass, Johnson grass, and various sorts of wheat and burley.  Common flowers include types of asters, coneflowers, Solidagos (goldenrods), vetches, Indian blankets and sweet clovers.

          Fauna Diversity: In North America common animals include: bison, pronghorns, deer, mice, rabbits, grouse, badgers, skunks, meadowlarks, various  owls, garter snakes, rattle-snakes, red-tailed hawks and prairie dogs. 

Major biomes

Wetland biomes

             Wetlands are areas of standing water that support aquatic plants. Marshes, swamps, and bogs are all considered wetlands. Plant species adapted to the very moist and humid conditions are called hydrophytes. These include pond lilies, cattails, sedges, tamarack, and black spruce. Marsh flora also include such species as cypress and gum. Wetlands have the highest species diversity of all ecosystems. Many species of amphibians, reptiles, birds (such as ducks and waders), and fur bearers can be found in the wetlands. Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations—these support different species of animals, such as shrimp, shellfish, and various grasses.

              The wetland biome is one that many people don’t really see as being important. In fact, in many areas they consider it to be a nuisance. Swampland is the most common type of wetland biome you will find. They also include marshes and bogs and they can be various sizes. Some of them are very long and deep. Others are nothing more than a few feet of water in a given location but they are still very important.

             In a wetland biome the water is always going to be standing still. You will find them in many low lying areas. It is common for them to be very close to lakes, rivers, and streams. They may have water in them all the time or only during particular times of the year. That is a key factor that separates it from other forms of biomes. The combination of both land and water are essential for this biome to form.

              They help the environment to be better due to the fact that they have a natural supply of water. They help to prevent flooding in many locations as they are able to take on excess water from the other sources. However, when a river or lake is low they can also release water back into them. They also have the natural ability to purify surface water.

              Plant matter is released into freshwater biomes from a wetland biome. The importance of this is that it allows for fish to have plenty of types of food for them to survive. Florida has one of the largest wetland biomes in the world. The humid conditions are perfect for such forms of plant and animal life to be able to survive.

Characteristics

             In a wetland biome the conditions are always very moist and humid. What you will find with characteristics can be very specific to a given location. That is because the wetland biome is so frequently going to overlap with or be a part of other biomes out there. Without this particular one though many others wouldn’t be able to thrive as they do.

             The only places on Earth where you won’t find the wetlands biome are around the Artic. The tundra there is too cold and frozen for them to develop. Just about every other biome though is associated with them in some way. In fact, many times the wetland biome is overlooked by people due to where it happens to be located. Experts though know what to look for and have been able to fully identify them.

             Wetland biomes can be made up of freshwater or saltwater. In some regions they are actually a combination of both. The type of water that is found in it will strongly affect the types of life that are able to survive there. The delicate ecosystems in place around these areas are very detailed. When you take the time and effort to examine them closely you will be very surprised by what you find.

Flora and Fauna

             It may surprise you to discover that the wetland biome has more diversity than any other biome out there when it comes to animal life. There are plenty of animals that find this to be the perfect home for them. They have the right climate, access to food, and the shelter they need for survival. Amphibians and reptiles due very well in this type of environment. They include frogs and lizards.

             Birds are also found in this type of environment. Many of them live there all year long. Others will be there for part of the year and then migrate. There are also those that stop to feed along a route to a new location in the wetland biome. With some species of birds it is found that they move from one wetland biome to the next along their migration patterns.

               Alligators and crocodiles are the largest animals found in the wetland biome. In some wetland biomes there is salt content in the water. When that is the case you may find some more diversity in those locations. Those living creatures include shrimp and shellfish.

              Beavers, minks, and rats are the fur bearing creatures you may find around a wetland biome. The size of them and the location will depend on many factors. For the beaver it will be determined by if they have enough for food. They also need various materials to build a dam from for shelter.

              Plant life that grows in the wetland biome are referred to as hydrophytes. They include pond lilies, cattails, tamarack, and blue spruce. Sometimes cypress and gum will be present too but it will depend on the actual location of the habitat. There are numerous types of grasses that grow in a wetland biome. Sometimes shrubs with fruits including the cranberry can be found in these locations.

Major biomes

Forest ecosystem

 Forest Ecosystem       

           
            A  is a terrestrial unit of living organisms (plants, animals and microorganisms), all interacting among themselves and with the environment (soil, climate, water and light) in which they live. The environmental "common denominator" of that forest ecological community is a tree, who most faithfully obeys the ecological cycles of energy, water, carbon and nutrients.

           A forest ecosystem would be considered having boundaries and would include a forest of trees out to the limit of tree growth. Remember that forests are not the only ecosystems. There are hundreds of thousands of defined and undefined ecosystems that can cover the broadest to the tiniest of areas. An ecosystem can be as small as a pond or a dead tree, or as large as the Earth itself.

              The forest ecosystem covers the flora, fauna and ground conditions with in the parameters of a forest. From the climatic conditions to the members and relationships in the food chain, the forest ecosystem is dependent on the major resources available. In the forest ecosystem the proportion of flora, including the varieties of trees, grasses, fungi and flowers will effect the way in which fauna exist.

      

           The fauna in a forest ecosystem will include the minute and the massive. The forest ecosystem offers shelter and living conditions to insects, birds, arachnids and mammals, from the tiny bush mouse to the largest primate or predator.

A Healthy Forest Ecosystem

             In the forest ecosystem the smallest creatures and plants are still important to the structure of the environment. From the smallest gnat to the largest predator, the relationship between the food chain is vital to the balance of the ecosystem. In the way that grass feeds cattle so too do smaller creatures become food for larger. Even the plants of the forest will become fodder for larger herbivores or small creatures. The forest ecosystem is balanced by the resources available. The number of trees, fungi, grass or flowers will be, maintained by the number of animals or insects using them for their lifestyle or food sources. If the number of predators in the forest ecosystem should alter, then the food chain would be unbalanced right down to the fundamental level. Even a slight alteration in the forest ecosystem, due to floods or drought or human intervention, can lead to the destruction of the forest ecosystem itself.

Forest ecosystem concepts:

                Often forest ecosystems are studied in watersheds draining to a monitored stream: the structure is then defined in vertical and horizontal dimensions. Usually the canopy of the tallest trees forms the upper ecosystem boundary, and plants with the deepest roots form the lower boundary. The horizontal structure is usually described by how individual trees, shrubs, herbs, and openings or gaps are distributed. Wildlife ecologists study the relation of stand and landscape patterns to habitat conditions for animals.

                 Woody trees and shrubs are unique in their ability to extend their branches and foliage skyward and to capture carbon dioxide and most of the incoming photosynthetically active solar radiation. Some light is reflected back to the atmosphere and some passes through leaves to the ground (infrared light). High rates of photosynthesis require lots of water, and many woody plants have deep and extensive root systems that tap stored ground water between rain storms. Root systems of most plants are greatly extended through a relation between plants and fungi, called mycorrhizal symbiosis.

                

           The biomass of a forest is defined here as the mass of living plants, normally expressed as dry weight per unit area. Biomass production is the rate at which biomass is accrued per unit area over a fixed interval, usually one year. If the forest is used to grow timber crops, production measures focus on the biomass or volume of commercial trees. Likewise, if wildlife populations are the focus of management, managers may choose to measure biomass or numbers of individual animals.

Our ecosystem