The results of a USDA experiment called PHACE (Prairie Heating and CO2 Enrichment) where liquid CO2 is injected into the ground from a storage tank, then effects measure on grassland growth, shows a surprising result: increased range grass growth leading to retaining more soil moisture. I hate it when that happens. I’ll have to give them credit though, back in 2007 in the paper starting the project they theorized from models that:
Model results suggest that soil water content, plant production, soil respiration, and nutrient mineralization will increase for the high-CO treatment. Soil water content will decrease for all years, while nitrogen mineralization, soil respiration, and plant production will both decrease and increase under warming depending on yearly differences in water stress.
And the credit is, they followed through with a ground truth experiment to verify the model.
But reality turned out to be different than model output. Big surprise. More photos here From the United States Department of Agriculture – Research, Education and Economics
USDA scientists study effects of rising carbon dioxide on rangelands
Rising carbon dioxide (CO2) levels can reverse the drying effects of predicted higher temperatures on semi-arid rangelands, according to a study published today in the scientific journal Nature by a team of U.S. Department of Agriculture (USDA) and university scientists.
Warmer temperatures increase water loss to the atmosphere, leading to drier soils. In contrast, higher CO2 levels cause leaf stomatal pores to partly close, lessening the amount of water vapor that escapes and the amount of water plants draw from soil. This new study finds that CO2 does more to counterbalance warming-induced water loss than previously expected. In fact, simulations of levels of warming and CO2 predicted for later this century demonstrated no net change in soil water, and actually increased levels of plant growth for warm-season grasses.
“By combining higher temperatures with elevated CO2 levels in an experiment on actual rangeland, these researchers are developing the scientific knowledge base to help prepare managers of the world’s rangelands for what is likely to happen as climate changes in the future,” said Edward B. Knipling, administrator of the Agricultural Research Service (ARS), USDA’s principal intramural scientific research agency.
The results cover the first four years of the eight-year Prairie Heating and CO2 Enrichment (PHACE) experiment on native northern mixed grass rangeland. The study is being conducted by the ARS Rangeland Resources Research Unit (RRRU) at the High Plains Grasslands Research Station near Cheyenne, Wyo.
ARS plant physiologist Jack Morgan leads the study, which uses both CO2 pipelines and thermal infrared heaters to simulate global warming conditions predicted for the end of the century: 600 parts per million (ppm) of CO2—compared to today’s average 390 ppm—and day/night temperatures raised by 3 and 5 degrees Fahrenheit, respectively.
Based on these findings, warmer temperatures would likely play a role in changing the relative success of various grass types. “Only the warm-season grasses had their growth boosted higher by CO2 and warmer temperatures,” Morgan said. “If this leads to a competitive advantage for warm-season grasses, it may increase the challenges faced by ranchers who desire cool-season grasses for early-season forage.”
Elise Pendall and David Williams at the University of Wyoming at Laramie and Matthew Wallenstein at Colorado State University at Fort Collins also are participating in the study, which will be completed in 2013. Retired ARS soil scientist Bruce Kimball, designer of the infrared heater system, is helping conduct the study. Kimball serves as a research collaborator at the ARS U.S. Arid-Land Agricultural Research Center in Maricopa, Ariz.
Grass-dominated, dry rangelands account for approximately a third of the Earth’s land surface, providing most of the forage eaten by livestock. This research, the first of its kind on this scale for rangelands, supports the USDA priority of helping farmers and ranchers throughout the United States and the rest of the world best adapt production practices to variable climate patterns.
Morgan said more research is needed to determine how the water-savings effect applies over the long run and in other types of semi-arid rangelands as well as to croplands in semi-arid areas. “It is important to understand that CO2 only offset the direct effects of warming on soil water in this experiment, and that it is unlikely to offset more severe drought due to combined warming and reduced precipitation projected for many regions of the world,” he said.
In addition to ARS funding, the research is supported by grants from the National Science Foundation, the U.S. Department of Energy, and USDA’s National Institute of Food and Agriculture.
h/t to Bruce Hall
How about they just drop all models related to co2 and just admit that it is the breath of life for all plants and animals.
I hate it when that happens.
/
I can’t imagine how this got published.
It is important to understand that CO2 only offset the direct effects of warming on soil water in this experiment, and that it is unlikely to offset more severe drought due to combined warming and reduced precipitation projected for many regions of the world
In other words: “we falsified our original prediction by experiment, but we still hold our original prediction was right — just not in this case”.
You think that having just falsified one prediction that they would be wise to rethink their original assumptions. But apparently not.
CO2 causes plants to grow?!? Astonishing.
What will we learn next?
(we really need a sarcasm font …)
Ok — so they admitted the truth (1) — then speculated what would happen if the theory were only right….
Morgan said more research is needed to determine how (1) the water-savings effect applies over the long run and in other types of semi-arid rangelands as well as to croplands in semi-arid areas. (2) “It is important to understand that CO2 only offset the direct effects of warming on soil water in this experiment, and that it is unlikely to offset more severe drought due to combined warming and reduced precipitation projected for many regions of the world,” he said.
Hey — you gotta follow the orthodox preaching man… even if you did disprove the IPCC Climate -bible…
Oh the convolutions to deceive, when we endeavor to believe!
Duh? Plants grow in the presence of CO2? And they claim we were in denial? Imagine that – this project has to be scrapped and the quicker the better otherwise what will the eco-fanatics blame next? Obviously no self respecting “green” pages would dare publish this on their forum.
Maybe I should mention this story back in 2010.
Plant physiologist Steve Prior, plant pathologist Brett Runion, and their colleagues at the ARS National Soil Dynamics Laboratory in Auburn, Ala., found that water use efficiency response to
high CO2 was much greater for soybeans than for sorghum over the 6-year study.
The outdoor study was done using open-top growth chambers for exposing the crops to the higher levels of CO2. The crops were monitored for photosynthesis and transpiration during their reproductive growth stages, when water demand is highest.
The scientists compared soybean/sorghum rotations with both conventional tillage and no-till. With no-till there is no plowing, only minimal disturbance of the soil while planting seeds. The scientists also compared current ambient CO2 levels—about 370 parts per million (ppm)—with levels of 720 ppm expected within this century.
With the higher level of CO2, regardless of tillage method, soybean photosynthesis increased by about 50 percent, while sorghum photosynthesis rose by only 15 percent. This was expected because crops like soybean, which have a C3 photosynthetic pathway, are known to respond better to high CO2 levels than crops like sorghum and corn that have a C4 photosynthetic pathway. Most plants worldwide are C3 plants.
Sorghum’s increased water use efficiency was mainly due to less water transpired or lost through the leaf pores (stomata).
Although no-till didn’t make a difference as far as crops responding to high CO2, it can greatly reduce soil erosion, conserve soil water, and increase carbon storage, among its many benefits.
The results of this research were published earlier this year in the Journal of Environmental Quality.
Provided by USDA Agricultural Research Service
Liquid CO2 What temperature and pressure?
I thought you were supposed to claim that the models predicted this even when they didn’t.
“PhacePalm”
I think it is time that the “Warmista Apologia” was standardised to save them time and effort. Perhaps we could start with:
1. More research is needed, send grant money to the following address……..
2.Our observations are obviously in need of data processing/adjusting/smoothing (choose one) as they do not agree with the model.
2 Our results in no way, shape or form contradict the facts of AGW in spite of not being in agreement with any of them.
Anyone have any suggestions?
Dear Moderators,
“injected into the ground from a storage tank, then effects measure on grassland growth”
Should be: “then effects on grassland growth measured”
They need to re-do the experiment without the silly heaters, to match our actual future: higher CO2 but lower temps.
The latest Science has a doom&gloom coral-reef article, full of ‘projected’, ‘expected’, ‘could’, ‘may’, etc.
When Warmistas utter ‘forecast’, ‘project’, ‘predict’, or ‘expect’, just read ‘FANTASIZE’.
Ideological blinders firmly fixed, they march over the Credibility Cliff, pockets stuffed with Govt $.
Everybody go out and throw dry ice on your lawn!!!!!!!!!!!!!!
“…and that it is unlikely to offset more severe drought due to combined warming and reduced precipitation projected for many regions of the world,”
Now, wait – is AGW supposed to increase the rainfall due to more water vapor in the air due to the higher temps or is AGW supposed to decrease the rainfall because…droughts only occur when it is hot (yeah, right!)?? I do wish these folks would make up their collective minds & get it straight.
/sarc.
Jeff
Note that they induced “day/night temperatures raised by 3 and 5 degrees Fahrenheit, respectively,” (1.7 – 2.8 C). They only tested the model predictions, not what would actually happen under 600 ppm of CO2. No one knows what would happen to air temperatures under 600 ppm of atmospheric CO2. So, what the study shows is that under model-predicted dire thermal circumstances, which may well be different from reality, arid range land grasses still do very well. If 2050 ushers in 600 ppm of CO2 and a more reasonable 0.1-0.5 C temperature increase (or no sensible increase at all), range lands could turn boisterous.
There’s a paper somewhere that shows that plants reduce their stomate density in increased CO2 environments. This leads to far less transpiration and makes them significantly more water efficient. IIRC, most plants have a fully packed stomate pattern below about 250 ppm which makes sense when we know they struggle below 200ppm.
Plants LUV CO2 !! and so should we.
“Only the warm-season grasses had their growth boosted higher by CO2 and warmer temperatures,” Morgan said. “If this leads to a competitive advantage for warm-season grasses, it may increase the challenges faced by ranchers who desire cool-season grasses for early-season forage.”
So let me get this straight… it took how many 100k in grants and how many PHDs to figure out that plants that like hot weather do better in hot weather… and plants that like cold weather do better in cold weather… and that if the planet is getting hotter…hot weather plants will have an advantage?
Where’s my PHD I knew that back in 4th grade…
Emphasis added.
Don’t mean to nitpick but shouldn’t “high-CO” read high-CO2
Next thing they’ll be telling us plants give off oxygen. Jack, I don’t want to rain on your parade but you know those CO2 global warming predictions that are suppose to occur over the next 100 years. That’s all BS.
So in two days I expect a RealClimate response attempting to debunk the model whilst ignoring the observed results. Seems to be their trend lately.
Whenever this topic comes up I try to steer those interested to the Duke Forest FACE series of experiments which demonstrated the positive benefits of enhanced CO2 on trees.
This was one of several FACE experiments managed by our national labs and not all of the experiments had the same positive plant response.
http://public.ornl.gov/face/results.shtml
http://public.ornl.gov/face/DUKE/duke_data_plantresponse.shtml
Ugh, how many sites did they have, how represetative were the locations and were conditions in that time period represenative of global conditions? It’s usually a logical error to extrrapolate local results to global predictions. I would love to see this repeated elsewhere before drawing any conclusions or making global models based on the results of a small regional experiment on a short time scale. Also, global precipitation has increased. Did they simulate a change in precipitation? Doesn’t sound like it. Was there a controll group of locations which were exposed to different combinations of influence? This sounds an awefull lot like ice core and sediment samples taken at a few locations but without adequate sample size to be significant.
Well, at least they admitted their observations did not match their theory. They still added the ususal ” Global Warming still exists” letterhead though, just to be sure to get more funding.
I’ve also noticed a distinct lack of the ususal trolls on this thread. Maybe they are off at RC being prepped what to say?
Dale says:
August 3, 2011 at 4:22 pm
That’s because all they understand is models. You throw reality at ’em, and they’re lost in cyberspace (As in “How the he!! do I evaluate reality with nibbles and bits?”)