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Wednesday, January 28, 2015
Ancient fires stoke CRD climate plans Travis Paterson
conditions may be like if induced by climate change. There are models suggesting temperaIn the wilderness of a remote South tures in southern B.C. may increase 2-3 Island lake, Kendrick Brown leans over degrees C by 2100, he said. Extracting pollen and charcoal fragthe boat’s edge and drives a hollow tube ments from the lake sediment cores into the soft lakebed sediment below. What he pulls out, one metre at a time, allows the team to assess how vegetation is a historical timeline embedded in lay- and fire changed through time,” Brown ers of organic and non-organic matter. It said. “We now have a sense of how the fire tells him about the past, and helps paint regime has changed in the Sooke Lake a picture of what’s to come. “They’re nature’s archives: strati- Reservoir catchment throughout the graphic sequences in the mud that read Holocene (period) and will be informing like pages in a book,” says Brown, a the CRD about the natural variability of research scientist with the Canadian For- fire events within the water supply catchment,” he said. “We’re now est Service. working to understand how “Basically, the same vegetation in the catchmud that you sink your ment has changed through toes into during a summer n Brown’s team use a time, the signal of which is swim is the cover of the Livingstone corer to reach contained in abundant fosbook, a recording of hislake sediment depths sil pollen grains in the seditory of the region based of up to 10 metres, ment.” on the matter that has sometimes more. The The forestry scientists settled into the lake floor.” deeper the corer goes, have teamed up with the Brown’s project team is the older the sediment. CRD because the regional based out of the Pacific body needs to know about Forestry Centre in Saanfire risk to water supply, ich and includes research Brown said. technician Nicholas “We’re using nature’s archives to learn Conder, Nicholas Hebda, and University of Victoria co-op student Kiera Smith. how the land responded to past changes While the focus is on the past, the results in climate and identifying past periods that might be analogues for the future,” can help inform about the future. The team’s current focus is on sedi- he said. Are future generations of South Islandment cores collected from the Greater Victoria Water Supply Area, namely from ers destined to live in a fire-prone region? Begbie Lake and the Sooke Lake Reser- Not quite, but fire disturbance may increase in the future. voir. “We need to plan for and protect against Brown is examining records from these lakes because paleoclimate indicators this risk. While fire is not a common form suggest the past time interval known as of disturbance today, it was more prevathe early Holocene (11,700-7,000 years lent in the past,” Brown said. That plan is still a few years off. The ago) was warmer and drier compared to team is hoping to produce an initial present-day. Scientists hope the data may serve report of findings by the end of 2016. as a first-order reference to what future reporter@saanichnews.com News staff
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Travis Paterson/News staff
Dr. Kendrick Brown of the Pacific Forestry Centre points to a two-centimetre layer of volcanic ash in a core sample from Begbie Lake. The ash was deposited after Oregon’s Mt. Mazama erupted 7,700 years ago. Brown is part of a research team preparing a report for the CRD that describes what the South Island’s anticipated transformation to a warmer, dryer climate will mean for the Sooke Lake Water Reservoir.
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