1. Calculation of energy transfer efficiency:
Energy transfer efficiency = Assimilation amount of previous trophic level ÷ Assimilation amount of next trophic level × 100%
< p> Assimilation amount = Intake - volume of feces and urine2. Energy transfer efficiency, energy is transferred step by step through the food chain. Solar energy is the source of energy for all activities of life. It enters the ecosystem through light and the action of green plants, and then is transferred from green plants to various consumers. The characteristics of energy flow are as follows: 1. Unidirectional flow: The energy released by various parts of the ecosystem into the environment through various channels can no longer be used by other organisms. 2. Gradual decrease: the energy that each part of the ecosystem transmits; Ecosystem discharges into the environment dimigradually fade. The energy from the previous level cannot meet the needs of a small number of organisms at the next level. organisms, thus forming a pyramid-shaped trophic level relationship.
In the food chain, matter and energy circulate constantly.
Energy is transferred step by step through the food chain and food web. Solar energy is the source of energy for all vital activities. It enters the ecosystem through photosynthesis of green plants and is then transferred from green plants to various consumers.
The characteristics of energy flow are: 1. One-way flow: energy released into the environment by various parts of the ecosystem through various channels can no longer be used by other other organizations.
2. Step by step decrease – the energy fixed in each part of the ecosystem decreases step by step. In a wayGenerally speaking, the further back on the food chain, the smaller the number of organisms, forming a pyramid-shaped trophic level relationship.
Characteristics of energy flow:
The characteristics of energy flow are: unidirectional flow and gradual decrease.
Unidirectional flow: means that the energy flow of the ecosystem can only flow from the first trophic level to the second trophic level, and then to the next trophic levels in order. Typically, reverse flow is not possible. This is determined by the nutritional structure formed by the long-term evolution of organisms. For example, wolves prey on sheep, but sheep cannot prey on wolves.
A gradual decline means that the energy supply at one trophic level cannot flow 100% to the next trophic level. The energy gradually decreases to mesure that it circulates along the food chain. The average efficiency of energy transfer along the food web is 10-20%, that is, only 10-20% of the energy from one trophic level is used by the next trophic level .