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questions :describe elaborately on the three types of ecological pyramids
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[Visitor (112.21.*.*)]answers [Chinese ]Time :2022-02-12
Ecological pyramid: The individual number, biomass or energy of each trophic level organism in the ecosystem are arranged in order of trophic levels and drawn into a map, which resembles a pyramid, so it is called an ecological pyramid or ecological cone. It refers to a certain quantitative relationship between various trophic levels, which can be used in biomass units, energy units or individual quantitative units, and the ecological pyramid composed of these units is called the biomass pyramid, the energy pyramid and the quantity pyramid, respectively.
Biological quantity cone
The biomass cone is a pyramid based on the number of individual organisms of each trophic grade. This type of pyramid also tends to be inverted. Meaning of each step: Indicates the number of biological individuals of each trophic grade.
The general shape of the biometric cone. Because in the predatory chain, as the trophic level rises, the energy is less and less, and the size of the animal is generally larger and larger, so the number of biological individuals is less and less.
Example: A statistic was given to all biological members on a patch of grass:
Producer (weed) 5842424 plants;
Primary consumers (herbivores, insects) 708 624;
Sub-consumers (carnivorous, insect-eating birds) 354 904;
Tertiary consumers (carnivores, bird-eating eagles) 156,362.
The special shape of the quantity cone: such as the relationship between a tree and the number of insects and birds on the tree.

Ecological pyramid ecological quantity cone
Meaning of each step of the biomass cone: Indicates the mass of the existing organisms at each trophic level, that is, the total mass of organic matter.
General shape of the biomass cone: Energy exists in the form of matter, so the biomass of each trophic level (the total mass of existing bioorganics) represents the level of energy value to some extent, in this sense, the shape of the biomass pyramid is generally similar to the shape of the energy pyramid.
Example: People have counted ecosystems in a sea area:
Producers (macrophyllum) 48 million tons;
Primary consumers (small fish and shrimp that eat macrophylla) 12 million tons;
Secondary consumers (large fish such as eating small fish and shrimp) 170,000 tons;
Tertiary consumers (fish that eat big fish, etc.) 30,000 tons.
The special shape of the cone of biological quantity: for example, in marine ecosystems, the producer phytoplankton is small, short-lived, and will continue to be eaten by zooplankton, so the biomass of the phytoplankton surveyed at a certain time may be lower than the biomass of its predator zooplankton, but this is not to say that the energy flowing through the producer link is less than the amount of phytoplankton flowing through the zooplankton.

Ecological pyramid bio-energy cone
Refers to the unit time of each nutrient level obtained by the energy value from low to high drawn into a pyramid shape, called the energy pyramid. The lower the nutrient level, the more energy it occupies; conversely, the higher the nutrient level, the less energy it occupies. Therefore, the energy pyramid base is the largest, and the higher it goes, the smaller it is. The energy pyramid will never be inverted. As can be seen from the energy pyramid: in an ecosystem, the more nutrient levels there are, the more energy is consumed during the energy flow. Biomass Pyramid: A pyramid drawn on the biomass of each trophic grade. This type of pyramid is generally not inverted in terrestrial ecosystems. The shape of the bio-energy cone is always positive pyramidal.

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