"Loess Plateau" PPT

Description

"Loess Plateau" PPT

Part One: Introduction of New Course

Import: What geographical information does this song contain:

1. The author’s hometown is located in the ( ) terrain area.

2. "Whether it is the northwest wind or the southeast wind, it is my song." This tells you that the climate here is ( ).

3. The river flowing through this land is ( ).

4. The characteristic houses here are ( ).

The Yellow River is the river with the largest sediment content in the world

The sediment in the Yellow River mainly comes from the Loess Plateau

The Loess Plateau is the area with the most severe soil erosion in my country and even in the world.

Loess Plateau PPT, part 2 content: course experiment

Experiment 1. Characteristics of loess

loose loess soil

Experiment 2: The slope is the same, the relationship between soil erosion and rainfall intensity

Experimental results:

Heavy rainfall - large surface runoff and scouring

Weak rainfall - small surface runoff and small erosion

Precipitation in the Loess Plateau is concentrated in July and August, with frequent heavy rains, thus exacerbating soil erosion.

Experiment 3: The rainfall slope is the same, the relationship between water, soil, water and vegetation

1. Slopes with good vegetation coverage and weak soil erosion;

2. Slopes where vegetation has been destroyed will suffer from strong soil erosion.

Loess Plateau PPT, Part 3: Dangers of Soil and Water Erosion

Harms caused by soil erosion on the Loess Plateau:

1. It leads to the reduction of cultivated land area and the decline of soil fertility.

2. A large amount of sediment flows into the Yellow River, causing an above-ground river to form in the lower reaches of the Yellow River, which can easily cause floods.

Control of water and soil erosion

Looking back at the causes of water and soil erosion and the actual situation on the Loess Plateau, which of the factors affecting water and soil erosion are controllable by humans and which are beyond human control? Therefore, what effective measures can humans take to control soil erosion?

Improving ground material conditions and vegetation coverage can be controlled artificially.

Loess Plateau PPT, Part 4: Governance

Control of Soil and Water Erosion in the Loess Plateau

1. Biological measures (vegetation restoration) - are fundamental measures

In order to control soil erosion on the Loess Plateau, what measures should be taken to restore vegetation?

2. Engineering measures (damming and siltation)

What is the role of damming and silting the land?

1. Detain sediment and prevent it from flowing into the downstream river.

2. The sediment on the dam has accumulated to form a "dam land" with deep soil and good soil quality.

Loess Plateau PPT, Part 5: Summary

"China Agenda 21" points out that it is necessary to "maintain steady growth in agricultural productivity, increase food production and ensure food security, develop the rural economy, increase farmers' income, and change rural poverty and backwardness", while also "protecting and improving the agricultural ecological environment, Reasonable and sustainable use of natural resources."

In short, for the Loess Plateau, ecological construction is the top priority, but it must take care of people's lives and not at the expense of reducing people's quality of life. We must not only pay attention to long-term ecological benefits, but also take into account the short-term living difficulties that local people may have, coordinate development, and grasp the "measures". Each place and situation cannot be one size fits all.

Operation

Investigate which ecological environments in our hometown need to be managed, write an investigation report, and provide suggestions and suggestions to make the sky in our hometown bluer, the mountains greener, and the water clearer.

(Tip: existing problems, hazards, causes, and control measures)

Keywords: Free download of Geography PPT courseware for the second volume of the eighth grade edition of Business Planet Edition, Loess Plateau PPT download, .PPT format;

For more information about the "Loess Plateau" PPT courseware, please click the "Loess Plateau" ppt tab.

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Update Time: 2024-09-09

This template belongs to Geography courseware Business Planet Edition Geography for Eighth Grade Volume 2 industry PPT template

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