Soil
The basis of the living skin of the
planet.
Four components
• Air
• Water
• Minerals
• Organic matter
Traditionally, they are seen as :
Air, Water, Earth and Fire (as...
Air
• Atmospheric gasses, present in
spaces created by interstices of soil
particles
• Atmospheric gasses, conducted into
...
Water
1. Water is gained by the soil through
rainfall or flood.
2. Water is lost by the soil through
gravitational action,...
Earth
• Earth is represented by
minerals that constitute the non-
organic solid component of
soils. This mineral fraction ...
Fire
• Solar energy that
sequesters organic
matter
• Geothermal energy that
sequesters organic
matter
• Nuclear energy tha...
Organic Matter
• Truly the Cinderella. The wonder of
the world of soil carbon has
generally been ignored by much of
soil s...
Soil Biodiversity
• One gram of soil may contain 1-2
billion individual bacterial cells. This
accounts for a mass of about...
The basis of sustainable
agriculture- ‘Living Soil’
• The combined biomass
of all soil organisms in
one hectare is equal t...
Erosion of soil biomass by
adding artificial fertilizer
• As this component
is reduced, the
biological power
component to
...
Regenerating soils
How can we design an active soil ecosystem that is analagous
to the mature soils that once existed in t...
Techniques in regenerating
soils
• Ramial chopped wood
• Remineralization
• Revegetation
• MSI
• Mulching
• Composting
Roots and Soil
• Tree Roots provide up to
20% of their total root
weight as exudates into
the surrounding soil.
• Each Spe...
A diversity of species creates
a rich soil
Water is a critical part of soil
Trees and Plants contribute over 28,300
GT/yr of fresh, clean water to the
atmospheric water reservoir.
• Principle 5 Map
out flow and
reservoir
• system
(existing and
potential)
• Principle 9
Utilize
ecological
processes
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Soil (from and Analog Forestry perspective)

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A presentation by Dr. Ranil Senanayake that describes the functions, characteristics and importance of soil in maintaining stable and healthy ecosystems. The presentation is offered from the perspective of Analog Forestry and its guiding principles.

Published in: Environment, Technology
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Soil (from and Analog Forestry perspective)

  1. 1. Soil The basis of the living skin of the planet.
  2. 2. Four components • Air • Water • Minerals • Organic matter Traditionally, they are seen as : Air, Water, Earth and Fire (as Biomass represents the capture of solar energy)
  3. 3. Air • Atmospheric gasses, present in spaces created by interstices of soil particles • Atmospheric gasses, conducted into passages and pores created by macroorganisms • Atmospheric gasses, transported into the soil through the action of vegetation. • Atmospheric gasses, transported into the soil through the action of extra fossorial events
  4. 4. Water 1. Water is gained by the soil through rainfall or flood. 2. Water is lost by the soil through gravitational action, transpiration and evapotranspiration 3. Microorganisms and plants influence the retention of water in the soil 4. The capacity to retain water influences the biodiversity of the soil ecosystem and vice versa 5. Water composition of the soil is impacted by compression or disturbance. 6. The water composition of the soil is greatly influenced by short- term climate events
  5. 5. Earth • Earth is represented by minerals that constitute the non- organic solid component of soils. This mineral fraction of soil is described in terms of the size of particulate matter. Ranging from rock, sand to clay. • Minerals are usually transported by wind, water or other geologic agency or are found in situ where they were formed. The mineral fraction of soil usually takes many thousands of years to form
  6. 6. Fire • Solar energy that sequesters organic matter • Geothermal energy that sequesters organic matter • Nuclear energy that sequesters organic matter.
  7. 7. Organic Matter • Truly the Cinderella. The wonder of the world of soil carbon has generally been ignored by much of soil science. Ranging from about .01 to 10 % in proportion. This diminutive fraction is really the engine that drives all of agriculture. • The principal property of soil fertility is determined by biological factors, mainly by microoganisms. The development of life in the soil endows it with the property of fertility .Krasil’nikov 1958.
  8. 8. Soil Biodiversity • One gram of soil may contain 1-2 billion individual bacterial cells. This accounts for a mass of about 350- 7100 kg of bacteria per hectare in the upper 15 cm of soil. Similarly it has been found that actinomycetes may reach populations of 200 million or more individuals per gram of soil. This group which falls between the bacteria and fungi are able to decompose organic matter at moisture levels too low for either bacteria or fungi to operate effectively. The fungi are present in similar numbers and often have a kilometre of hyphae in a gram of soil (Allison, 1973).
  9. 9. The basis of sustainable agriculture- ‘Living Soil’ • The combined biomass of all soil organisms in one hectare is equal to that of twenty horses • The daily operation of these organisms yield the power of about 20 HP per hectare . This energy goes into maintaining the productivity and sustainability of the soil ecosystem.
  10. 10. Erosion of soil biomass by adding artificial fertilizer • As this component is reduced, the biological power component to sustaining the soil is reduced. The process if allowed to continue leads to desertification and complete loss of soil productivity.
  11. 11. Regenerating soils How can we design an active soil ecosystem that is analagous to the mature soils that once existed in the area ? The living soil should be supported by a terrestrial ecosystem that provides it with the critical OM increment What is missing in terms of mineral matter and biodiversity should be replaced exogenously but in a seral sequence, that is analogous to the native systems.
  12. 12. Techniques in regenerating soils • Ramial chopped wood • Remineralization • Revegetation • MSI • Mulching • Composting
  13. 13. Roots and Soil • Tree Roots provide up to 20% of their total root weight as exudates into the surrounding soil. • Each Species of tree provides differing chemical compounds • Many species of trees have distinct species of associated soil organisms
  14. 14. A diversity of species creates a rich soil
  15. 15. Water is a critical part of soil
  16. 16. Trees and Plants contribute over 28,300 GT/yr of fresh, clean water to the atmospheric water reservoir.
  17. 17. • Principle 5 Map out flow and reservoir • system (existing and potential) • Principle 9 Utilize ecological processes

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