37 What nutrient eg element has the strongest influence on the rate of

37 what nutrient eg element has the strongest

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37. What nutrient (e.g., element) has the strongest influence on the rate of microbial activity in soil? How can we tell? Could you test this in SSC 100 lab? How? Soil organisms 38. What is a soil food web? What are major roles that different members play? What are some of the types of relationships between members (not all shown on food web figure). How might these relationships affect our ability to isolate and study soil organisms? 39. How have things changed in how we classify (and measure) biodiversity? What is the basis for how we classify all life forms (tree of life approach--e.g., based on Woese--as described in class, not book). What is power of having this approach? E.g. how can you determine if a certain group (e.g. Anthrax) is present in your soil? 40. What are the 3 major groups of MICRO organisms and how do they differ (think phylogeny, size, growth form, cell wall components). 41. What are several ways in which water content affects soil organisms? Why can fungi remain active (e.g. not as spores) at very negative water potentials? 42. What are other major groups of organisms (>micro)? What are their main functions? Why do we call earthworms ecosystem engineers? Explain how they alter the soil physical infrastructure. 43. What are major differences in biological communities between agricultural fields and less managed systems? How does tillage affect soil communities? What happens to numbers and diversity as you move deeper into soil profile. Why? 44. Define rhizosphere. How does it differ from “bulk soil” with respect to soil biology and chemistry? Why? 45. What is difference between biomass, numbers and function (or activity rate)? Which biota makes up most biomass and which contribute the greatest biodiversity to soil communities? 46. Contrast two plant-microbe relationships: symbiotic nitrogen fixers and mycorrhizae. Who are plants involved, who are microbes and who gets what from relationship? What happens to symbioses when soil is high in N or P (e.g. fertilized)? 47. What are roles of microbes in agroecosystems, what agricultural practices reduce biodiversity, how can microbial roles be promoted/enhanced?
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  • Fall '08
  • Staff
  • Bacteria, Mycorrhiza, Soil biology

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