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4D29 Lai Hei Kin

Intercropping in the tropical semi-arid climate of the Sahel can effectively conserve soil and water resources despite challenges like infertile soil and water shortages through several key strategies:

1. Soil Erosion Prevention

- Root Systems: Different crops have varying root structures that help bind the soil, reducing erosion from wind and rain.

6. Nutrient Cycling

- Resource Utilization: Different crops can utilize and restore various nutrients, enhancing soil health and reducing dependence on chemical fertilizers.

2. Soil Erosion Reduction

- Ground Cover: A mix of crops provides better ground cover, reducing erosion by wind and water. Crop residues from intercropped plants add organic matter to the soil, enhancing its structure and stability.

By leveraging these benefits, intercropping serves as a sustainable agricultural practice that helps conserve vital soil and water resources in the Sahel, making farming more resilient in an arid environment.

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在薩赫勒地區，間種可以通過以下方式保護土壤和

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在薩赫勒地區，間種可以通過以下方式保護土壤和水資源，具體如下：

### 1. 提高土壤肥力

- 多樣化作物：間種不同類型的作物（如穀物和豆類）可以幫助改善土壤的養分結構。豆類植物有固氮作用，能將空氣中的氮轉化為植物可吸收的形式，從而增加土壤中的氮含量。這樣的養分增加不僅能提高作物產量，還能減少對化肥的需求，促進更健康的土壤生態系統。

### 2. 減少水分蒸發

- 遮蔽效果：不同作物的葉片和生長高度可以形成自然的遮蔭，減少直接陽光照射到土壤表面，從而降低水分蒸發率。這在乾旱季節尤其重要，因為保持土壤濕潤可以幫助植物在缺水的情況下存活並生長。

### 3. 防止土壤侵蝕

- 根系固定：不同作物的根系在土壤中交錯生長，能有效固定土壤，減少侵蝕風險。根系的存在可以幫助減少雨水沖刷造成的土壤流失，特別是在暴雨期間，這有助於保護土壤層和保持其生產力。

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4B15

1. **土壤養分循環**：

- 不同作物之間的根系可以促進土壤中養分的循環，某些作物（如豆類）能固定氮，改善土壤的肥力。

2. **減少侵蝕**：

- 透過種植多種作物，根系相互交錯，有助於穩定土壤結構，減少水土流失，從而保持土壤的肥力。

3. **水分保持**：

- 間作能增強地面覆蓋，減少水分蒸發，同時通過不同作物的根系增加土壤的水分滲透性，有助於提高水資源的利用效率。

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間種（Agroforestry）在保護薩赫勒地區的土壤和水資源方面具有多種有效的策略：

1. **提高土壤肥力**：通過種植樹木和農作物的混合，間種可以增加土壤中有機物質，改善土壤結構和肥力。

2.**增加土壤覆蓋**：多種作物共同生長，能防止土壤裸露，減少侵蝕。

3. **提高水分利用** ：不同根系的作物能更有效地吸收土壤中的水分，減少水分流失。

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4D 31 Sun Yu Han

### 1. Improved Soil Fertility

- Diverse Root Systems: Different crops have varied root depths, which helps in nutrient uptake from different soil layers.

- Nitrogen Fixation: Leguminous plants can fix atmospheric nitrogen, enriching the soil and reducing the need for chemical fertilizers.

### 2. Soil Erosion Reduction

- Ground Cover: A mix of crops provides better ground cover, reducing erosion by wind and water.

- Organic Matter: Crop residues from intercropped plants add organic matter to the soil, enhancing its structure and stability.

### 3. Water Conservation

- Moisture Retention: Diverse plant cover reduces evaporation rates and helps maintain soil moisture.

- Microclimates: Different crops create shaded areas that can lower soil temperatures and minimize water loss.

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4C13 Weng Ka Ching

Here's how intercropping can help conserve soil and water resources in the Sahel region:

Intercropping, the practice of growing two or more crops in close proximity, can offer several benefits for soil and water conservation, especially in a challenging environment like the Sahel:

Improved Water Use Efficiency: Different crops have different root systems and water requirements. By intercropping, you can utilize water resources more efficiently at different soil depths. Some crops may have deep roots that access deeper water sources, while others have shallower roots, reducing competition for water in the topsoil.

Reduced Evaporation: A dense canopy created by intercropping can reduce soil temperature and evaporation from the soil surface, conserving water.

Enhanced Soil Cover: Intercropping provides better ground cover than a single crop, protecting the soil from the impact of raindrops and wind, which can lead to erosion.

In summary, intercropping is a sustainable agricultural practice that can significantly improve soil and water conservation in the Sahel by optimizing water use, protecting the soil from erosion, and enhancing soil fertility.

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4D 07 Lai Tsz Lam

Intercropping in the tropical semi-arid regions of the Sahel can effectively conserve soil and water resources through several mechanisms:

1. Improved Soil Structure

Different root systems of intercropped plants can enhance soil aeration and structure, reducing compaction and promoting better water infiltration.

2. Reduced Erosion

Covering the soil with diverse plant species protects it from wind and water erosion. The plant canopy helps to shield the soil surface from direct rainfall impact.

5. Organic Matter Addition

Leguminous plants in intercropping systems can contribute organic matter through leaf litter and root decay, enhancing soil fertility and water-holding capacity.

These practices not only help conserve soil and water but also contribute to sustainable agricultural productivity in the challenging environment of the Sahel.

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4C21

間種在保護薩赫勒地區的土壤和水資源方面有以下作用：

• 減少土壤侵蝕：間種不同高度和根系結構的作物，如高稈作物與矮稈作物搭配，能增加地面覆蓋度，減緩風速，降低風對土壤的侵蝕作用。同時，作物的根系可以固著土壤，減少水土流失。

• 減少水分蒸發：間種形成的多層次植被結構，可遮擋陽光直射地面，降低土壤表面溫度，減少水分蒸發。像高稈作物為矮稈作物遮蔭，能有效減少矮稈作物生長區域的水分散失。

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1.  增加植被覆蓋，減少水分蒸發和土壤風蝕

間種通過在農田中同時種植多種不同高度、生長週期和根系深度的作物（如樹木、灌木、穀物、豆類），增加了地面的植被覆蓋率和覆蓋時間。

茂密的植被冠層能有效遮擋陽光直射，降低了地表溫度，從而大大減少了土壤表層水分的直接蒸發損失，令更多的水分得以保留在土壤中供作物利用。

亦能減少土壤受風的侵蝕，可直接攔截風力，降低了近地面的風速。這顯著減少了強風對裸露表土的吹蝕作用，防止肥沃的表土被吹走，減少土壤退化的機會。

2.  改善土壤結構，增強下滲作用

間種的不同作物的根系在土壤中形成網絡，特別是深根系樹木或灌木與淺根系作物的結合。

深根系植物能穿透緊實的土層，創造出通道當降雨發生時，這些根孔有助於雨水更快、更深地滲入土壤，減少地表徑流，讓土壤迅速吸收。

下滲能力的增加可直接減少地表徑流的機會，從而降低了水流對土壤的

3. 維持土壤肥力

間種中包含的樹木或豆科作物，會產生大量的枯枝落葉凋落在土壤表層，分解後能味為土壤提供有機物質，例如氮、磷、鉀等多種養分以及最重要的有機質。這能維持及提高了土壤肥力，避免了因單一作物連作導致的土壤貧瘠和土壤退化。

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4A15

1. Improves Soil Structure and Fertility

- Enhanced organic matter: Intercropping often includes legumes (e.g., cowpeas or groundnuts), which fix nitrogen in the soil through symbiotic relationships with nitrogen-fixing bacteria. This enriches the soil and reduces the need for synthetic fertilizers.

- Reduced soil erosion: A mix of crops with different root systems stabilizes the soil. For instance:

- Deep-rooted plants (e.g., millet or sorghum) anchor the soil and prevent wind erosion.

- Shallow-rooted crops create a protective cover that minimizes water runoff and surface erosion.

- Better soil porosity: Diverse root systems improve soil aeration and water infiltration, reducing compaction and enhancing soil health.

2. Reduces Water Loss

- Improved ground cover: Intercropping ensures continuous soil coverage, which reduces evaporation by shading the soil surface.

- Water-use efficiency: Different crops may use water from different soil depths. For example:

- Deep-rooted crops (e.g., sorghum) access water from deeper layers.

- Shallow-rooted crops (e.g., beans) use water from the topsoil, optimizing water utilization.

- Microclimate regulation: The canopy of intercropped plants reduces wind speed and evaporation, helping conserve moisture in the soil.

3. Increases Resilience to Drought

- Diverse crop resilience: Some intercropped species may be more drought-tolerant than others, ensuring at least one crop survives in dry conditions.

- Efficient resource sharing: Crops with complementary needs reduce competition for limited water, allowing both to thrive even in water-scarce conditions.