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Soil biodiversity and human health
Introduction of a paper byDiana H. Wall, Uffe N. Nielsen & Johan Six
3 December 2015, Vol 528, Nature 69
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Soil biodiversity
• Species richness• Functional diversity• Foodweb structure•Biotic interactions
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Poor land management
•Deforestation•Degradation•Desertification•Urbanization•Pollution
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Climate change
•Precipitation•Temperature•Extreme events
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Loss of ecosystem functioning and service provision•Water infiltration•Regulation of pests and pathogens•Erosion control•Nutrient release
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What is caused:
• Increased soil-borne pathogen and pest load•Reduced supply of food and
clean water and air
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Human health impacts
• Increased risk of diseases caused by human pests and pathogenscaused by less nutritious foodcaused by lack of clean water and air
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Scheme of deterioration
Soil biodiversity
Poor land management
Climate change
Loss of ecosystem functioning and service provision
Human health impacts
Soil-borne pathogen and
pest load
Food, clean water and air
Increase in Decrease in
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Complex foodweb
Carbon source
First consumers
Second consumers
Third consumers
Predators
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Simple foodweb
Carbon source
First consumers
Second consumers
Third consumers
Predators
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Human influence on soil foodwebs
Complex foodweb
Simple foodweb
Global changes and Agricultural intensification
Lost or impaired functioning
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How decisions on land use management are linked to human health through the effect on soil biodiversityLand-use management Intensive SustainablePest and pathogens Increase DecreaseBeneficial organisms Decrease IncreaseSoil biodiversity Low HighPlant health Decrease IncreaseAnimal health Decrease IncreaseHuman health Decrease Increase
External drivers: Climate change, nitrogen deposition, invasive species, and pollution
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Soil pathogens and parasites of humans
Euedaphic pathogens Soil transmitted pathogens
Anthrax DiarrhoeaListeriosis Salmonellosis
Typhoid feverAspergillosis ToxoplasmosisValley fever AscariasisHistoplasmosis Hookworm
strongyloidiasisBeeftapeworm
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Soil pathogens and parasites of animals and plants
Euedaphic pathogens Soil transmitted pathogens
AnimalsAnthrax Haemonchosis
PlantsCrown gallPotato blightRoot knotPine wood
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Soil biodiversity and soil-borne pathogens• Soil-borne pathogens and parasites that
cause human diseases represent a minority of the species living in soils.•Most of soil organisms have positive effects
on human health through their roles in controlling soil-borne pathogens and pests.
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Soil and allergies
• Exposure to soil microorganisms lessens the prevalence of allergic diseases.• Individuals living in more urban
environments have lower diversity ofbacteria on their skin and lower immunityexpression.
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Food, fiber and biomass production• All terrestrial crop production is soil-based.• Sustainable use of our soil is essential for
long-term human health.• Enriched soil life increases nutrient use
efficiency, plant nutrient uptake and thereby crop yields.
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Air quality
• Land use change is related to• Frequency of dust storms,• Emission of greenhouse gases,• Release of volatile organic compounds and biota in
air.• The mis-use of land increases dust and the
formation of particulate matter of less than 10micrometer in size (PM10).
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Air quality
• Soil organisms such as arbuscular mycorrhizae, saprotrophic fungi and earthworms play a key part in stabilizing soil.•Management options such as reduced tillage
have been shown to decrease PM10formation.
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Water quality
• Land use changes, especially in urbans, affect the relationship between runoff versus infiltration of water.• It has potential impacts on local surface
water bodies, groundwater levels, areas downstream of point source pollution and the recharge of aquifers.
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Water quality
• Soil biodiversity acts to enhance the structure of soils and thereby infiltration and percolation of water through the soil profile.• This improves water use efficiencies by crops
(1), limit the amount of agricultural runoff and associated contamination into adjacent land areas (2), and filter out pathogens and contaminants (3).
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 2• End hunger• Achieve food security and improved
nutrition• Promote sustainable agriculture• Globally, one in nine people are undernourished. This
goal aims to end hunger.
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 3•Ensure healthy lives•Promote well-beings for all at all ages• Ensuring people live healthy lives can cut child
mortality and raise life expectancy.
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 3Target 3.9•Reduce harmful chemicals•Reduce air, water and soil pollution
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 3Target 3.3•Ending epidemics of tropical and other
communicable diseases
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 6• Sustainable management of water and
sanitation• Clean water protects people from disease, yet
three in 10 people lack access to it.
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 12•Ensure sustainable consumption and
production patterns• This goal aims to foster eco-friendly production,
reduce waste and boost recycling.
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UN Sustainable Development Goals closely related to soil biodiversity
Goal 15• Protect, restore and promote sustainable use of
terrestrial ecosystems,• Sustainably manage forests, combat
desertification, halt and reverse land degradation, and halt biodiversity loss• To stop degradation, we must preserve forest, desert and
mountain ecosystems.
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Soil lies in the background
•Benefits related to “Food”, “air”, “water” or “disease” control are all simultaneously dependent on soils and soil biodiversity