of Loess Plateau of Loess Plateau Average soil erosion 3700t/km 2 - - PowerPoint PPT Presentation

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May 24, 2023 280 likes •548 views

A Successful Example Ecological restoration Ecological restoration of Loess Plateau of Loess Plateau Average soil erosion 3700t/km 2 .a Total region area 0.62 million km 2 Sediment 1.6billion tons/year Soil erosion area 0.43

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Total region area 0.62 million km2 Soil erosion area 0.43 million km2 Serious erosion area 0.27 million km2 Average soil erosion 3700t/km2 .a Sediment 1.6billion tons/year Silt content 37.4kg/m3 (average) 500-600kg/m3 (max)

Ecological restoration

f Loess Plateau

Ecological restoration

f Loess Plateau

A Successful Example

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Vertical distribution of soil erosion patterns along slopes

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The eroded Loess Plateau

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Cultivation on slope land to cause soil erosion

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2 2 陕西的水土流失与土地退化

Soil loss from cultivation on steep slope lands

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Poverty

➢76% of poverty counties are in severe soil erosion regions ➢90% of poverty people live in severe soil erosion regions.

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To build terraced fields on slope land was one of the important measures to reduce soil erosion

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Terraced fields have many functions to control erosion and to increase grain yield and farmer’s income, but it is a big and consuming work.

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In 1999, The Premier Zhu Rongji inspected soil erosion and conservation on the Loess Plateau with the Governors of Shaanxi Province

They were thinking how to do with the broad area suffering soil erosion!

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Grain for Green Project

After inspection to Loess Plateau they visited our Institute and discussed this issue with scientists. Then the Grain for Green Project was proposed .

To convey cropping land on steep slopes to planting trees/grass (more than 25 degree in southwest region; more than 15 degree in northwest region)

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South China South China North China North China

Grain 2250 kg/ha.year
Cash 1875 yuan/ha.year
Seedling fee 750 yuan/ha
Grain 1500 kg/ha.year
Cash 1350 yuan/ha.year
Seedling fee 750 yuan/ha

Government will give some compensation including grain, cash and seedling fee

Compensation

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Progress & Impacts

To the end of 2013,

9.3 million ha of slope farmland has been conversed into forest/grassland

17.5 million ha of

barren mountains and hills were planted trees/grass. Forest and grass cover increased by about 4.5% for the whole China.

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Planting trees in fish-scale pits

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Reservoir

ISWC, CAS/MWR, YANGLING ,CHINA

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Dam-land in the gully

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京津风沙源治理工程

The project of desertification control around Beijing

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Integrated SWC model of watershed in Loess Plateau

Farming road terrace Tree planting Prohibition Check dam

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After implementing small watershed comprehensive control for 20 years, eco- environment has greatly improved.

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After 10 yr of implementing GGP, vegetation area increased, toward to north 400 km

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1970-1989 1990-2009 2000-2009

Sediment load decreased in Yellow river

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Thank You very much for your attention

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