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BIOL 103 (255)


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BIOL 103
Sidney Eve Matrix

many species depend on particular patterns of disturbances on the landscape such as fires and windstormsconservation biologists work to assess whether reestablishment of historic disturbance patterns can help preserve biodiversitymany plant species require periodic fires for successful establishment and survival but however controlled burning is a common forest management toolscars in the annual growth rings of trees preserve evidence of past fires that didnt kill them researchers can determine when fires occurred how severe they were and when fire patterns changed annual growth rings showed that lowintensity fires were common near LA until 1900after that cattle and sheep grazingand fire suppression reduced the frequency of lowintensity fireswithout these fires dead branches and needles accumulate in forests the belief that human know how to create functioning ecosystems has resulted in policies that make it easy to get permits for developments that destroy habitatsregulators believe that alternate wetlands can be created and so allow existing wetlands to be destructedin southern California 90 of coastal wetlands have been destroyed and wetland restoration is a high prioritysince the species have been lost it is not easy to reintroduce the speciesprevious attempts to create wetlands have failed and so established a large field experiment to discover whyfound that experimental plots planted with speciesrich mixtures developed a complex vegetation structure speciesrich plots accumulated nitrogen faster many people would like to consume only natural products that have been harvested in ways that protect biodiversity and ecosystem productivityForest Stewardship Council FSCestablished criteria that a forest products company must meet for its products to be certifiedhad most impact on forest management in temperate zones but certification of tropical
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