Question:
Trees help to maintain soil organic matter in an agroforestry system though ____.
Trees help to maintain soil organic matter in an agroforestry system though ____.
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SOM = "Dead stuff." To increase SOM, you must add dead biomass. In agroforestry, prunings and fallen leaves are the most efficient "natural compost" available.
Updated On: Aug 7, 2026
- Nutrient pumping
- Litter and root residues
- Blanketing effect
- Shading effect
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Soil Organic Matter (SOM) is the decomposed remains of plant and animal life. The question asks for the specific physical source or pathway through which trees add mass to the SOM pool.
Step 2: Detailed Explanation:
• The Source of Organic Matter: SOM is composed of carbon and nutrients. These must be physically added to the soil.
• Litter and Root Residues (B): This is the direct source. Trees shed leaves, twigs, and bark (above-ground litter). Simultaneously, tree roots are constantly growing and dying (root turnover/residues). These materials decompose over time to form humus, which is the core of soil organic matter.
• Analyzing other options:
- Nutrient Pumping (A): This is a process of nutrient recycling (moving nutrients from deep to shallow layers), but it doesn't necessarily explain the addition of organic carbon mass.
- Blanketing/Shading (C/D): These maintain or protect SOM by reducing soil temperature and slowing down the rate of decomposition (oxidation) by microbes. They are preservation mechanisms, but litter/roots are the production mechanisms.
Step 3: Final Answer:
The primary physical inputs for soil organic matter from trees are litterfall and root residues.
Soil Organic Matter (SOM) is the decomposed remains of plant and animal life. The question asks for the specific physical source or pathway through which trees add mass to the SOM pool.
Step 2: Detailed Explanation:
• The Source of Organic Matter: SOM is composed of carbon and nutrients. These must be physically added to the soil.
• Litter and Root Residues (B): This is the direct source. Trees shed leaves, twigs, and bark (above-ground litter). Simultaneously, tree roots are constantly growing and dying (root turnover/residues). These materials decompose over time to form humus, which is the core of soil organic matter.
• Analyzing other options:
- Nutrient Pumping (A): This is a process of nutrient recycling (moving nutrients from deep to shallow layers), but it doesn't necessarily explain the addition of organic carbon mass.
- Blanketing/Shading (C/D): These maintain or protect SOM by reducing soil temperature and slowing down the rate of decomposition (oxidation) by microbes. They are preservation mechanisms, but litter/roots are the production mechanisms.
Step 3: Final Answer:
The primary physical inputs for soil organic matter from trees are litterfall and root residues.
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