The Soil Resource

1. Front Matter

   Pages i-xx

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2. Ecosystems and Soils

   1. Front Matter

      Pages 1-1

      PDF

   2. Ecosystems and Soils

      • Hans Jenny

      Pages 1-18

3. Processes of Soil Genesis

   1. Front Matter

      Pages 19-19

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   2. Water Regimes of Soils and Vegetation

      • Hans Jenny

      Pages 21-47

   3. Behavior of Ions in Soils and Plant Responses

      • Hans Jenny

      Pages 48-94

   4. Origin, Transformation, and Stability of Clay Particles

      • Hans Jenny

      Pages 95-112

   5. Biomass and Humus

      • Hans Jenny

      Pages 113-146

   6. Soil Colloidal Interactions and Hierarchy of Structures

      • Hans Jenny

      Pages 147-159

   7. Pedogenesis of Horizons and Profiles

      • Hans Jenny

      Pages 160-197

4. Soil and Ecosystem Sequences

   1. Front Matter

      Pages 199-199

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   2. State Factor Analysis

      • Hans Jenny

      Pages 201-206

   3. The Time Factor of System Genesis

      • Hans Jenny

      Pages 207-245

   4. State Factor Parent Material

      • Hans Jenny

      Pages 246-275

   5. State Factor Topography

      • Hans Jenny

      Pages 276-304

   6. State Factor Climate

      • Hans Jenny

      Pages 305-336

   7. Biotic Factor of System Genesis

      • Hans Jenny

      Pages 337-360

   8. Integration of Factors and Overview of Book

      • Hans Jenny

      Pages 361-368

5. Back Matter

   Pages 369-377

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change is simply described by the rate of income and rate of loss. Our home's energy budget, our firm's inventory, our nation's debt, and humanity's numbers all have accounts that change at rates that are equal to the inputs minus the outputs. Jenny's "system view" of the soil was carried into the fertile fields of Midwestern American prairies from the laboratories of Switzerland in the late 1920s. Jenny's rate equations provided the other paradigm or world view that, I recall, brought us to the threshold of systems ecology as it later evolved in the second half of the twentieth century. As if world renown in the specialties of pedology and soil chemistry were not enough for one lifetime, excerpts below remind us that Hans Jenny has also been a perceptive outdoor field ecologist since his early Alpine expeditions with Braun­ Blanquet in the mid 1920s. Jenny's ecosystem studies in the pygmy forest, a further classic example of a soil-plant system "run down" over hundreds of thousands of years since its origin, continue to occupy some of the vigorous retirement time near his farm in Mendocino County. But each specific, quantitative case study, and each research area conserved (with additional hard work) for further study by future generations, fits into Jenny's coherent world view. It is that view, and its legacies of discovery and of tangible landscape preserves, which we are privileged to share with their originator in this volume.

• Boden
• Humus
• Soil
• ecology
• ecosystem
• forest

• Department of Plant and Soil Biology, College of Natural Resources, University of California, Berkeley, USA

  Hans Jenny

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