RAM 382 final 2007 - RAM 382 Spring 2007 Final Exam 100...

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1 RAM 382 Spring 2007 Final Exam 100 points 10 May 2007 Name:__ ANSWERS _________________________________ 1. Haideinger and Keeley (1993) described the response of California Chaparral species to the time since the last fire and the frequency of fires by comparing the density of plants at five sites with different combinations of time since the last fire and frequency of fires in the previous six years. The table below describes those fire history characteristics for each of the five (A-E) sites. Site Years Since Last Fire Number of Fires in Six Years A 1 1 B 1 2 C 1 3 D 4 2 E 6 1 Which site(s) should have the greatest density of a species with the following life history traits: 1) annual life-span and 2) fire stimulates seed germination (3 points) Sites A, B, and C Which site(s) should have the greatest density of a species with the following life history traits: 1) annual life-span, 2) fire is not required to stimulate seed germination, and 3) germination and plant density are positively related to disturbance frequency. (3 points) Site C (partial credit to B or D) 2. Structural attributes can be used to distinguish one community from another. Use the structural attributes of physignomy and composition to distinguish the California Oak Woodland from Ponderosa pine-grass communities. Physignomy comparison (4 points): Oak Woodland and Ponderosa pine-grass have very similar physiognomies which have a tree layer and herbaceous layer, and few shrubs. When shrubs are present they are more common in Ponderosa pine-grass. Composition comparison, give common name or genus and species for two common species in each community (8 points): Ponderosa pine-grass: California Oak Woodland
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3. Compare the successional time frame vegetation dynamics over the last 100 years between the California Oak Woodland and the Ponderosa pine-grass communities. To make this comparison, draw a typical age structure diagram of tree-sized individuals of blue oak in the California Oak Woodland Community and ponderosa pine in the Ponderosa pine-grass community using the blank figures below (8 points) BLUE OAK AGE STRUCTURE 2 % trees 20 10 tree age (yrs) 100 0 0 50 PONDEROSA PINE AGE STRUCTURE 20 10 tree age (yrs) 100 0 0 50 4. You are managing an area that receives < 50 cm/yr of precipitation, it is covered by California Oak Woodland vegetation, and Quercus douglasii cover is 65%. You want to combine the long-term, sustainable production
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RAM 382 final 2007 - RAM 382 Spring 2007 Final Exam 100...

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