Soil Organisms and Ecology

1
Soil Organisms and Ecology

• Chapter 11

2
Table 11.1
3
(No Transcript)
4
FIGURE 75 Interrelationships of autotrophic
and heterotrophic organisms nutrient cycling and
energy flow.
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
5
FIGURE 74 Most soil microbes live on
surfaces. Top Fungal hyphae on a sand grain.
Bottom Bacteria (Rhizobium) attached to a root
hair.
.. leads to association with plants
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
6
I. Associations with Plants
7
FIGURE 715 LegumeRhizobium symbiosis
typical stages in development.
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
8
FIGURE 717 Mycorrhizae. (A) Major types of
mycorrhizae.
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
9
FIGURE 718 Mycorrhizal association between
root hairs and the fungal hyphae
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
10
II. Soil Management Effects
11
III. Soil Organism Table
12
FIGURE 71 Sizes and forms of soil
inhabitants, in relation to soil particle sizes.
Michael J. Singer and Donald N. MunnsSoils An
Introduction, 6e
13
IV. Practical Outcomes of Adaptations

• A. Actinomycetes medical antibodies
• B. Mycorrhizal and N fixing symbiosis improve
  productivity of cultivated plants
• C. Predatory/Parasitic Fungi/Protozoa control
  root pathogens
• D. Specialized/Opportunistic Bacteria eliminate
  toxic materials