GC 170a1 1st Edition Lecture 16 Outline of Last Lecture I Natural Climate Variability II Proxy methods Outline of Current Lecture II Paired Activity Current Lecture I Paired Activity a Collect environmental data for five Bristlecone Pine Sites i Three in California Sheep Mt SHP Campito Mt CAM Methuselah Walk MWK ii Two in Colorado Almagre Mt ALM Hermit Lake HER b What will be learnt i Site selection 1 A group of trees that are sampled at a location 2 Sites are usually named after geographic location ii Moisture sensitive vs temperature sensitive sites 1 Temperature sensitive At higher elevations growth is limited by cold temperature a Warm summers longer growing season wide rings b Cold summers shorter growing season narrow rings 2 Moisture sensitive At lower elevations trees are limited by precipitation a Wet winters more rain snow wide rings b Dry winters less rain snow narrow rings iii Skeleton plot master 1 A graphic representing the narrow rings in a tree ring sample 2 Skeleton plots are used for crossdating 3 Lines represent narrow rings iv Ring width index 1 A time series plot showing trends in ring width tree growth over the past 250 years v Frost Rings 1 A frost ring is a row of damaged cells in the middle of a tree ring These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 2 Very cold temperatures cause the cell damage in the trees a Likely to happen for temperature sensitive trees growing at high elevation
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