Plants and Climate Change- Bad News?
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1 Plants and Climate Change- Bad News?
2 Climate Change has been linked to increased extreme events such as high temperatures, droughts, floods, cyclones, even increased cold events.
3 But are we really in a period of Unprecedented Extremes? Recent (past 50,000 years) temperatures would suggest otherwise.
4 And what does the data actually say?.
5 Floods- Worldwide Analysis of trends and of aggregated time series on climatic (30-year) scale does not indicate consistent trends in floods, worldwide. Despite common perception, the detected trends are more negative (less intense floods in most recent years) than positive. Similarly, Svensson et al. (2005) and Di Baldassarre et al. (2010) did not find any systematical change in flood frequency, or in flood magnitudes.
6 Some scientists and the Media would have you believe that the recent US drought is a result of climate change. The drought that s turned most of the United States into a dessicated hotbox may be a symptom of climate change, a brutal blowback from carbon pollution. redscience/2012/07/clim ate-change-drought/ Droughts in the U.S But what does the DATA tell us?
7 Highest Recorded Temperatures by Region and Date. What is unusual about these figures? According to Dr David Viner, a senior research scientist at the climatic research unit (CRU) of the University of East Anglia (2000). Within a few years winter snowfall will become a very rare and exciting event Children just aren't going to know what snow is"
8 It is also instructive to see what CO 2, and temperature were like at major events in plant evolution. Major Plant evolutionary events
9 Rate of Photosynthesis Limitations on Photosynthesis Light Limited CO 2 Limited Many plants are unable to make the most use of the light they receive even in the UK! Full Sunlight (UK Summer) µmol.m 2 s -1
10 So what happens to photosynthesis if we change ambient CO 2 concentrations? Some plants (C4) naturally concentrate CO 2 within their leaves to well over 1000ppm. Why do you think the Dutch grow produce in heated greenhouses with elevated (1000ppm) CO 2?
11 Raising CO 2 Levels also Increases Photosynthetic Temperature Optima Hence increased temperatures are nothing to worry about- provided CO 2 also increases. 35 o C 25 o C In fact transferring C3 plants to high [CO 2 ] (1000ppm) makes them photosynthesise like a C4 plant. More photosynthesis means more food!
12 C4 plants, which concentrate CO 2 within their leaves, not only have higher photosynthetic rates but are also about twice as efficient in their water use. Increasing atmospheric CO 2 will greatly increase the water use efficiency of plants, particularly C3, allowing them to grow with less irrigation/colonise areas which were previously too dry.
13 So given C4 superiority in terms of net photosynthesis and water use efficiency, why is their distribution limited? They are poorly adapted to cold conditions- but who knows in a warming World would C4 plants become alien invaders? Unlikely as C3 photosynthesis is more efficient at the lower light intensities typical of temperate latitudes.
14 So Increased CO 2 is Good for Plants? YES! Ainsworth, E.A. and Long, S.P. (2005). What have we learned from 15 years of freeair CO 2 enrichment (FACE)? A metaanalytic review of the responses of photosynthesis, canopy properties and plant production to rising CO 2. New Phytologist 165: Summary data from 279 published experiments in which plants of all types were grown under paired stressed (open circles) and unstressed (closed circles) conditions. There were 208, 50, and 21 experimental sets at 300, 600, and an average of about 1350 ppm CO 2, respectively. CO 2 enrichment also allows plants to grow in drier regions, further increasing the expected global response.
15 And More Recently Vanuytrecht, E., Raes, D., Willems, P. and Geerts, S. (2012). Quantifying fieldscale effects of elevated carbon dioxide concentration on crops. Climate Research 54:
16 Finally-What s Happening Outside in the Real World? Lots! Normalised Vegetation Density Index (NVDI) Satellite data The Amazon Basin in Transition Davidson et al (2012) Nature doi: /nature10717 Lead researcher said The boost to growth from CO 2, the main gas blamed for causing climate change, was likely to exceed damaging effects of rising temperatures this century. Recent images in the Sahel (Southern Sahara) show dramatic increases in vegetation cover as plant colonise areas previously too dry.
17 Recommended Reading Vanuytrecht, E., Raes, D., Willems, P. and Geerts, S. (2012). Quantifying field-scale effects of elevated carbon dioxide concentration on crops. Climate Research 54: (PDF on VLE)
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