evapotran_slides

evapotran_slides - Called Chasmophytes Common throughout...

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Approximately 75% of all water use worldwide is used for irrigation.
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Irrigation is an attempt by man to locally alter the hydrologic cycle in order to promote increased agricultural productivity and to provide insurance against drought.
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Plant Water Needs 1) Photosynthesis: CO 2 + H 2 0 carbohydrates + 0 2 Light and chlorophyll 2) Transport nutrients from the soil to the leaves
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Vapor Density gradient Transpiration as the key process Water molecules
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Soil water Potential
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Cloud forest tree species cactus STOMATES
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Stomatal response to water stress
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Morphological responses to water stress
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Examples of drought strategies at the ecosystem level Drought avoidance strategies: maintain favorable levels of plant water potential Drought tolerance strategies: continue physiological activities in presence of decreasing leaf potential
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Evergreen tree species along topographic gradient 1500 m - PD 3000m - PS Barton And Teeri 1993
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Ecosystem #2: African savanna - 120 plants species – seasonal drought For 4-8 months/year deBie, Ketner, Paase, Gerling 1998
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Wall fissure and rocky outcrop plants
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Unformatted text preview: Called Chasmophytes Common throughout Mediterranean, Colorado Small root soil volumes Very shallow soil depths Limited water availability Waxy cuticles, Submerged stomates Fog absorption thru leaf surfaces Rossularia sp. Desert plant adapations to water limitation: • Extensive networks of shallow roots • Trunks that shrink and swell to hold water reservoir • Waxy outer coating to prevent water loss • Sunken stomates; reduced leaf surface area • CAM (Crassulacean Acid Metabolism) – inhale CO2 at night when cooler and moister to avoid daytime water loss; process photosynthesis during day More negative sap pressure = higher suction or tension Role and value of mycorrhizae hyphae for increasing Water absorption Morphological strategies to decrease boundary layer Willows, Quaking aspen Ecological relevance Turf grass Turf grass – drought response Roses Pick species adapted to local climate That don’t need supplemental water To survive....
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This note was uploaded on 04/08/2009 for the course NTRES 3240 taught by Professor Schneider,r. during the Spring '09 term at Cornell.

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evapotran_slides - Called Chasmophytes Common throughout...

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