Histosol.pptx

Soil Order Histosol

1. HISTOSOLS ( from the Greek , histos , tissue, and the Latin , solum , soil )

2. Global Distribution 2 1% land area 2 million km 2 High latitudes and other marshy wetlands

3. 3

4. 4 Major Characteristics organic soil materials no permafrost no andic properties dominant in the upper 60 cm

5. 5 Organic soil materials are saturated with water for at least 30 days or are artificially drained and contain ≥12 to 18% organic carbon by weight, excluding live roots, depending on clay content. Figure 2.3 . Organic carbon and clay contents required to differentiate organic and mineral soil materials

6. 6 Peat Muck

7. Humification 7 Mineralization Paludization/ Paludification Dominant Processes

8. 8 Paludization/Paludification

9. 9 Humification

10. 10 The Von Post Scale of Organic Matter Decomposition

11. 11

12. 12 Mineralization

13. 13 CLASSIFICATION

14. 14 Order Histosol ( ist )

15. 15 Suborder

16. 16 Great Groups 1.FIBRISTS Cryofibrists Haplofibrists Sphagnofibrists 2.HEMISTS Cryohemists Haplohemist Sulfohemist Sulfihemist Luvihemist

17. 17 3.SAPRISTS Cryosaprists Haplosaprists Sulfosaprists Sulfisaprists 4.FOLISTS Cryofolist Torrifolist Ustifolist Udifolist

18. 18 Subgroups

19. Dolongan Series Sab-a Basin and Dolongan Peatlands Typic Tropo hem ists Order Suborder Great Group Subgroup

20. It is embarrassing not to be able to agree on what soil is . In this the pedologists are not alone. Biologists cannot agree on a definition of life and philosophers on philosophy. — HANS JENNY , THE SOIL RESOURCE: ORIGIN AND BEHAVIOR 20