NUTRIENT CYCLING

1. NUTRIENT
CYCLING
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2. It Means..
Presentation title
Circulation or exchange of nutrient elements
between the living and non-living components
of an ecosystem is called the nutrient
cycle or biogeochemical cycle.
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3. By trees…
Presentation title
Trees play an important role in the
cycling of nutrients by recapturing and
pumping back leached nutrients via
deep roots, which work as a ‘safety
net’ against nutrient losses from the
nutrient cycle .
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4. How Does Nutrient Cycling Works?
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5. How nutrient cycling differs from energy flow?
Presentation title
• The energy flow refers to the transfer of energy from one trophic level to another in the food chain and food
web.
• It is unidirectional and energy is lost from one trophic level to another in the form of heat. Sunlight is the
ultimate energy source.
--------------------------------------------------------------WHERE AS-------------------------------------------------------------------
• Nutrient cycling is a cyclic process that encompasses the movement of nutrients from the physical
environment to living organisms and back to the environment. Nutrients are present on the earth where
they are recycled, transformed into different forms and reutilized.
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6. CARBON
SEQUESTRATION
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7. It Means..
Presentation title
Carbon sequestration is the process by which
carbon dioxide (CO2) is removed from the
atmosphere and stored in long-term sinks, such as
oceans, forests, soils, and underground geological
formations by reducing the amount of carbon dioxide
in the atmosphere with the goal of reducing global
climate change.
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8. MICROCLIMATE
AMELIORATION
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Through Agroforestry
Click here to read the reference article

9. What it means….
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Microclimate, any climatic
condition in a relatively
small area, within a few
meters or less above and
below the Earth's surface
and within canopies of
vegetation.

10. Management aspects
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• Farmers in arid and semi-arid rain-fed conditions in Africa are
resource-constrained and cannot afford capital-intensive
technological solutions such as irrigation.
• In drylands farmers often opt to deliberately manage trees on farm, if
not actively planting trees, to benefit from moderating micro-climate
as well as to procure food, fodder, timber and wood fuel. Indeed
farmers may deliberately plant fast-growing, competitive tree species
if they provide attractive economic returns
• It was reported to be greater in low as less than 800mm compared to
high rainfall zones

11. It helps in…
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• buffering the temperature and soil moisture
and enhancing the soil structure moderately,
which helps the plants to tolerate the dry
season.
• Micro-climate modification by trees also
provides ecosystem services that benefit
livestock.
• It protect heat-sensitive crops, wind breaks
and shelter belts to slow down the wind speed
to reduce evaporation and physical damage to
crops, and various crop-tree mixes to reduce
erosion and maximize resource use efficiency

12. SOIL
IMPROVEMENT
TF-2022-04-BIV
Click here to read the reference article

13. Methods of soil improvement
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• The integration of trees on farms enhances the field capacity , organic matter,
available potassium, available phosphorus, soil carbon stocks and lower bulk
density which retain water by increasing the water holding capacity and release the
water to plants gradually like a sponge
• Combining species with various root depths, integrating shade-tolerant species
beneath the crowns of the foundational trees, and including nitrogen-fixing species
into the mixtures to enhance soil nitrogen provision improves the resource-use
efficiency of the system
• The nutrient use efficiency will be enhanced due to the increased absorption and
availability of soil with high Organic matter and an active deep root system.
Additionally, the increased microbial diversity due to Organic matter addition
probably provides mycorrhizae, releasing P and making it accessible to crops
In agroforestry

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.
• The introduction of leguminous as well as non-leguminous species such as durian and
rambutan in cocoa-based agroforestry positively influences the nutrient content in the
soil
• The agro-silvopastoral system to be the most successful in increasing soil fertility, with
57% of farmers believing that the agro-silvopastoral system provided the highest degree
of soil fertility.
• N-fixing green manure plants had the potential to improve the soil properties
for e.g. Cluster bean, Cowpea , Green Gram

15. Poplar in soil improvement
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• wheat–poplar agroforestry system and sole wheat cropping system in
Uttarakhand, India, and proved the role of the agroforestry system in the
improvement of soil health against climate-related extremities.
• Another study carried out in semi-arid region of Northwest India by Sirohi
and Bangarwa reported that higher available soil N, P, and K levels
were observed in a 5 m × 4 m geometry than in 10 m × 2 m and 18 m ×
2 m × 2 m geometries (paired row) for 7–8-year poplar-based
intercropping.
• Thus, it was recommended that poplar trees be planted at a spacing of 5
m × 4 m as the most appropriate way to improve the soil fertility via the
accumulation of leaf litter in the semi-arid and arid areas of Northwest
India.

16. Not to be done!!!
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• Dense planting of herb species should be avoided, since an
increase in the species composition can negatively influence
the soil moisture owing to increases in root pores and organic
matter, increasing the infiltration and resulting in increased
leaching.

17. Thank you
Aditya Singh
Bijalwan
TF-2022-04-BIV
adityasingh
bijalwan069@
gmail.com
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