Lecture 35 Land-Use Change 2009 for web

Lecture 35 Land-Use Change 2009 for web - Land-Use Change...

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Land-Use Change & Ecosystem Services V. R. CAIVANO/AP – Nature 12 April 2007 11/23: Land-use change (Chp. 23) 11/25, 27: (Thanksgiving Break) 11/30: Global biogeochemical cycles: N (Chp. 24) 12/2: Global biogeochemical cycles: C (Chp. 24) 12/4: Climate change (Chp. 24) 2 Today’s Outline 1. Ecosystem Services and Global Land-Use Change 2. Case Study: Land-use change in the Amazon 3 Ecosystem Services • Fresh water generation • Water purification • Erosion prevention • Waste decomposition • Timber production • Carbon sequestration • Pollination (crops, native plants) • Pest control • Fish & game habitat • Maintain biodiversity Processes by which the environment produces resources , such as: 4 Ecosystem Services The benefits people obtain from ecosystems Supporting • Nutrient cycling • Soil formation • Primary Production • … Provisioning • Food • Freshwater (quantity) • Wood & fiber • Fuel… Regulating • Climate regulation • Flood regulation • Disease regulation • Water purification … Cultural • Aesthetic • Spiritual • Educational • Recreational… Millennium Ecosystem Assessment, 2005 5 We Depend on Ecosystem Services • Human activities appropriate: – 1/3 to 1/2 of global NPP (food, forage, fuel, fiber). – >50% of accessible runoff of fresh water for irrigation, industry, and drinking. 6 Land-Use Activities • Generally, seek acquisition of natural resources for immediate human needs • Activities include: – Converting natural ecosystems for human use – Changing management practices on human- dominated lands • Often at the expense of long-term degradation of other ecosystem goods & services . Foley et al. 2005, Science
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7 Common Land-Use Changes • Deforestation • Conversion to rangeland • Agricultural expansion • Agricultural intensification • Urbanization Amazon/Photo: NASA LBA, Don Deering Mexico City / Photo: Los Alamos National Labs
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Lecture 35 Land-Use Change 2009 for web - Land-Use Change...

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