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"Stability of Ecosystems" PPT courseware download
Part One: Classroom Thoughts
Thinking: In an ecosystem, organisms such as wheat, rats, and bacteria live. Assuming better climate conditions and a large increase in wheat, how will the number of rats change?
When an ecosystem develops to a certain stage, its structure and functions can remain relatively stable through certain adjustments.
The ecosystem has certain automatic adjustment capabilities
Ecosystems have the ability to maintain or restore their own structure and function to be relatively stable, so ecosystems have relative stability.
Ecosystem stability PPT, part 2 content: Ecological balance:
When the number and proportion of various organisms in the ecosystem can always remain relatively stable, it can maintain a relatively dynamic equilibrium state for a long time.
Characteristics of ecological balance:
1. The types and quantities of producers, consumers and decomposers in the ecosystem remain relatively stable (dynamic balance).
2. Have relatively stable food chains and food webs
3. Maintain a relative balance between the various components of the ecosystem and between the input and output of matter and energy.
The self-regulating ability of the ecosystem
Generally speaking, the more complex the ecosystem components are and the more biological species there are, the stronger the automatic adjustment ability and the higher the stability of the ecosystem.
There are certain limits to the ability of ecosystems to self-regulate.
Ecosystem stability PPT, Part 3: Factors affecting ecosystem stability:
1. Natural factors
Earthquakes, tsunamis, volcanoes, mudslides, epidemics, etc.
(1) Characteristics: The frequency is not high, and the distribution is limited and specific.
(2) Measures: plant trees, build dams and embankments, build reservoirs, and improve the surrounding ecosystem.
Predict and forecast natural disasters.
2. Impact of human activities on ecosystems
(1) Human’s unreasonable exploitation of natural resources includes:
A. Excessive logging of forests, overgrazing of grasslands, and overexploitation of oil and oceans have caused vegetation destruction.
B. Excessive hunting of certain animals causes damage to the food chain.
(2) Environmental pollution caused by human activities mainly refers to:
Air, water and soil pollution caused by industrial wastes, pesticides and fertilizers, domestic garbage, domestic wastewater, automobile exhaust, etc.
Keywords: Free download of science PPT courseware for the second volume of the ninth grade of Zhejiang Education Edition, PPT download of the stability of the ecosystem, .PPT format;
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"Ecosystem Stability" PPT download:
"Stability of Ecosystems" PPT Download Part 1 Content: New Lesson Introduction Gardening staff planted a piece of grass in a corner of the park. In order to prevent birds from eating grass seeds, they covered the grass with a net. After a while, they found that The grass in the net was eaten up by insects..
"Stability of Ecosystems" PPT courseware:
"Stability of Ecosystems" PPT courseware Part 1: Self-study examination 1. What is the stability of ecosystems? After a long-term development process, the ecosystem has gradually formed a relatively stable balance between biological and non-biological substances and energy, and between living things.
"Ecosystem Stability" PPT:
"The Stability of Ecosystems" PPT Part One Content: Learning Objectives 1. Tell what the stability of ecosystems is. 2. Outline the reasons why ecosystems have certain stability. 3. Briefly describe the reasons why ecosystem stability is destroyed. ... ... ... ecosystem..