by: priscilla arevalo angelica alvarado alyssa megan eileen gao
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Soil and Agriculture (p.229-233). By: Priscilla Arevalo Angelica Alvarado Alyssa Megan Eileen Gao. What is a Soil Profile?. Organic. Topsoil. Elluviation. Subsoil. Weathered P.M. Bedrock. Soil Properties. Soil Color Soil Texture Clay Silt Sand Loam Soil Structure Soil pH. - PowerPoint PPT PresentationTRANSCRIPT
By:Priscilla Arevalo
Angelica AlvaradoAlyssa Megan
Eileen Gao
SOIL AND AGRICULTURE (P.229-233)
WHAT IS A SOIL PROFILE?
Organic
Topsoil
Elluviation
Subsoil
Bedrock
Weathered P.M.
SOIL PROPERTIESSoil ColorSoil Texture
ClaySiltSandLoam
Soil StructureSoil pH
CATION EXCHANGE IS VITAL FOR PLANT GROWTH
• Soil characteristics vary from place to place.• Some regions have more fertile soils than others.
Tropical Rain Forest
Temperate Grassland
REGIONAL DIFFERENCES IN SOIL TRAITS CAN AFFECT AGRICULTURE
HUMAN PRACTICES THAT HAVE INCREASED VULNERBILITY OF SOIL
• Erosion: human activities have increased by 10-40 times rate of erosion occuring globally
• Human practices:
1.Industrial agriculture2.Deforestation3.Roads4.Climate change5.Urban spraw
DEGRADATION OF SOIL
1. Mulching
2. Contour Barriers
3. Rock Dams
Conservation Measures:
The largest areas of concern: Asia & Africa.Central America has highest percentage/worst degrees of soil degradation
“CLIMATE CHANGE TO DISRUPT SOIL NUTRIENTS IN DRYLANDS”
• Drop in nitrogen and carbon concentrations could have serious effects on ecosystem services.
• Study measured the nitrogen, carbon, and phosphorus content in soils at 224 sites.
“CLIMATE CHANGE TO DISRUPT SOIL NUTRIENTS IN DRYLANDS”
• Drylands consist of 40% of the world’s land area.
• Climate change can make these areas drier.
• It is hypothesized that the ecosystem properties of drylands may be irreversible.