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"End of Chapter Review and Evaluation" Vegetation and Soil on the Earth PPT
1. From the textbook - a systematic inventory of knowledge in this chapter
2. Go to life - analysis and application of hot issues
Hotspot (1) Distribution of black soil in my country
[Broaden your horizons]
Black soil is a unique treasure given to mankind by nature. It is a kind of soil with good properties and high fertility, which is very suitable for plant growth. There are only four major black soil areas in the world, namely the Ukrainian Plains in Ukraine, the Mississippi Plains in the United States, the Northeastern Plains in China, and the Pampas grasslands from Argentina to Uruguay in South America.
[Open your mind]
1. Where are the black soils in Northeast China mainly distributed?
Tips: The west of Sanjiang Plain, the east and north of Songnen Plain.
2. What are the conditions for the formation of black soil in Northeast China?
Tips: The rain and heat in summer are at the same time, which is conducive to vegetation growth; the winter is long, cold and dry, and there are many litters; microbial activity is weak, and litter decomposes slowly; the terrain is flat, and nutrients are not easily lost.
Hot Topics (2) Problems arising during the development of black soil
[Broaden your horizons]
During the great land reclamation in the 1950s, this fertile land was plowed by 54-horsepower imported tractors. From 1963 to 1976, 540,000 educated youths joined the ranks of developing the Great Northern Wilderness. Educated youths from large and medium-sized cities such as Beijing, Tianjin, Shanghai, and Harbin implanted urban civilization into remote frontiers and developed black soil. . During the large-scale development and reclamation process in the black soil areas of Northeast China, serious water and soil erosion problems also occurred, mainly manifested in the loss of black soil layers on large sloping farmland and the erosion gullies formed by water and soil erosion. Severe soil erosion is making China's fertile black soil in Guandong become "thin" and "yellow". Experts warn that if prevention and control is not stepped up, "black soil" may become a historical term in books.
[Open your mind]
1. What are the main problems that arise in the development of black soil in Northeast China?
Tips: Soil erosion, thinning of the soil layer, and decrease in soil fertility.
2. How did the problems faced by Northeastern black soil arise?
Tips: Over-cultivation and destruction of vegetation.
Hotspot (3) Black soil protection measures
[Broaden your horizons]
Northeast China is my country's largest grain production base and commercial grain export base, and is the "ballast stone" for national food security. The No. 1 Central Document of 2019 clearly stated that "increasing the protection of black soil in Northeast China". The protection of black soil is urgent and of great significance. Protecting black soil in Northeast China is a historical mission and a systematic project. We must implement comprehensive policies in accordance with the requirements of green development to form synergy and It takes a long time to achieve success.
[Open your mind]
How to improve soil fertility from a geographical perspective?
Tips: Implement a scientific and reasonable farming system; strengthen the fertilization of black soil, return crop straws to the fields, and apply more organic fertilizers; plant trees and strengthen the management of slopes and ravines.
Keywords: Hunan Education Edition High School Geography Compulsory Course 1 PPT courseware free download, end-of-chapter review and assessment PPT download, vegetation and soil on the earth PPT download, .PPT format;
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