Download The Findit App

Share Your Posts On These Major Social Networks

Instatag Your Posts to Instagram Facebook + Twitter

News

Long-Term Open-Top-Chamber Study of Sour Orange Trees

Salt Lake City 11/21/2014 10:11:00 PM

In July of 1987, as described by U.S. Department of Agriculture researchers Idso and Kimball (2001) , eight 30-cm-tall sour orange tree (Citrus aurantium L.) seedlings were planted directly into the ground at the Agricultural Research Service's U.S. Water Conservation Laboratory in Phoenix, Arizona, where they were enclosed in pairs within four clear-plastic-wall open-top chambers. Then, in November of that year, the two scientists began to continuously pump ambient air through two of the chambers via perforated plastic tubes that lay upon the ground beneath the trees, while through the other two chambers they began to pump air that was enriched with carbon dioxide to a concentration that was 300 ppm greater than that of the surrounding ambient air, which had an average CO2 concentration of 400 ppm. And thus was born one of the longest atmospheric CO2 experiments ever to be conducted anywhere in the world. 

Throughout the experiment, the Phoenix global-change research team irrigated and fertilized the trees according to standard agronomic practices in the area, in order to keep them as free as possible from water and nutrient stresses; and they measured the circumferences of the trees' trunks at a height of 45 cm above the surface of the ground at the midpoint of every month. At the ends of the second and third years of the study, they also determined the total trunk and branch volume of each tree from trunk and branch length and diameter measurements; and from these data they developed a relationship between trunk crosssectional area and trunk plus branch volume that applied equally well to both the CO2-enriched and ambient-treatment trees. Then they made numerous wood density measurements that finally allowed them to calculate the total aboveground woody biomass of each tree at the midpoint of every month. In addition, all of the oranges produced by the trees were picked, counted and weighed each year; and a large number of the fruit were dried in ovens to determine the amount of dry matter they contained. And by these means the two researchers developed a yearly record of total fruit biomass production to accompany their monthly record of wood biomass production. 

As the experiment progressed, the CO2-enriched/ambient-treatment ratio of cumulative aboveground wood biomass rose rapidly from an initial value of unity to a value slightly in excess of 3.0 at the two-year point of the study, as shown in the figure below, which depicts the changing ratio of the aboveground wood biomass of the CO2-enriched trees to that of the ambient-treatment trees over the first two years of the study. 

More News

https://s3.amazonaws.com/findit-pictures/19221/1779165_19221_160115073943

The Influence of CO2 on Plant Antioxidants

Center for the Study of Carbon Dioxide and Global Change. "The Influence of CO2 on Plant Antioxidants.” Last modified January 8, 2015. http://www.co2science.org/subject/a/summaries/antioxidants.php.

Released On: 1/16/2015
Views: 6350

https://s3.amazonaws.com/findit-pictures/19221/1771807_19221_050115011904

Health Effects of Hot Vs Cold Temperatures in Asia

Health Effects of Hot Vs Cold Temperatures in Asia.

Released On: 1/5/2015
Views: 6590

https://s3.amazonaws.com/findit-pictures/19221/1767800_19221_291214123540

Coral Reef Responses to Temperature Stress: Thermal Adaptation

Coral Reef Responses to Temperature Stress: Thermal Adaptation. As living entities, corals are not only acted upon by the various elements of their environment,they also react or respond to them.

Released On: 12/29/2014
Views: 6237

https://s3.amazonaws.com/findit-pictures/19221/1767752_19221_291214111658.jpg

Forest Growth Response to CO2

Forest Growth Response to CO2. By examining various properties of tree rings, researchers can deduce how historical increases in the air's CO2 concentration have already affected tree productivity and water use efficiency.

Released On: 12/29/2014
Views: 4837

https://s3.amazonaws.com/findit-pictures/19221/1767751_19221_291214110504.jpg

Onward Marches the Great Pause

Onward Marches the Great Pause. Since October 1996 there has been no global warming at all (Fig. 1).

Released On: 12/29/2014
Views: 3884

https://s3.amazonaws.com/findit-pictures/19221/1752698_19221_081214123011.jpg

RESPONSE OF VARIOUS MARINE ANIMALS TO OCEAN ACIDIFICATION AND WARMING

RESPONSE OF VARIOUS MARINE ANIMALS TO OCEAN ACIDIFICATION AND WARMING.

Released On: 12/8/2014
Views: 3511

https://s3.amazonaws.com/findit-pictures/19221/1752697_19221_081214121522.jpg

FACE EXPERIMENTS AND GRASSLAND SPECIES

FACE EXPERIMENTS AND GRASSLAND SPECIES.

Released On: 12/8/2014
Views: 4115

https://s3.amazonaws.com/findit-pictures/19221/1752696_19221_081214114115.jpg

EFFECTS OF OCEAN ACIDIFICATION ON FISH

EFFECTS OF OCEAN ACIDIFICATION ON FISH.

Released On: 12/8/2014
Views: 4132

https://s3.amazonaws.com/findit-pictures/19221/1741944_19221_211114021804.jpg

Response of Fish to Ocean Warming

Response of Fish to Ocean Warming. According to the IPCC, CO2-induced global warming will be net harmful to the world's marine species.

Released On: 11/21/2014
Views: 4052

https://s3.amazonaws.com/findit-pictures/19221/1741943_19221_211114021100.jpg

Long-Term Open-Top-Chamber Study of Sour Orange Trees

Long-Term Open-Top-Chamber Study of Sour Orange Trees. Eight 30-cm-tall sour orange tree (Citrus aurantium L.) seedlings were planted directly into the ground at the Agricultural Research Service's U.S. Water Conservation Laboratory in Phoenix, A ...

Released On: 11/21/2014
Views: 4088

https://s3.amazonaws.com/findit-pictures/19221/1741902_19221_211114020343

The Global Medieval Warm Period

The Global Medieval Warm Period. Between the 10th and 14th centuries AD, earth's average global temperature may have been warmer than it is today.

Released On: 11/21/2014
Views: 3877

https://s3.amazonaws.com/findit-pictures/19221/1701566_19221_300914015604

Growth Rates of Old versus Young Forest Trees

Growth Rates of Old versus Young Forest Trees. The planting and preservation of forests has long been acknowledged to be an effective and environmentally-friendly means for slowing climate-model-predicted CO2-induced global warming.

Released On: 9/30/2014
Views: 4136

https://s3.amazonaws.com/findit-pictures/19221/1701354_19221_300914102740

Tropical Trees

Citation: Center for the Study of Carbon Dioxide and Global Change. "Tropical Trees.”

Released On: 9/30/2014
Views: 4203

https://s3.amazonaws.com/findit-pictures/19221/1701356_19221_300914105354

Water Use Efficiency of Agricultural Species

Water Use Efficiency of Agricultural Species.

Released On: 9/30/2014
Views: 4101

https://s3.amazonaws.com/findit-pictures/19221/1689629_19221_120914021236

GLOBAL TEMPERATURES AND BIOSPHERIC PRODUCTIVITY

Global temperatures and biospheric productivity. Among the many climate-alarmist fears of CO2-induced global warming is the concern that the productivity of the biosphere will decline if global temperatures rise to the extent predicted by compute ...

Released On: 9/13/2014
Views: 4074

https://s3.amazonaws.com/findit-pictures/19221/1689623_19221_120914020343

REWRITING SUNSPOT HISTORY

Rewriting sunspot history. In 2006, when I first made the mistake of writing publicly of my doubts about the Party Line on manmade global warming.

Released On: 9/13/2014
Views: 4134

https://s3.amazonaws.com/findit-pictures/19221/1689620_19221_120914015840

ANALYSIS OF THE SECOND ORDER DRAFT OF THE WORKING GROUP I CONTRIBUTION TO IPCC 5AR

ANALYSIS OF THE SECOND ORDER DRAFT OF THE WORKING GROUP I CONTRIBUTION TO IPCC 5AR. The preparation of IPCC Assessment Reports involves several stages.

Released On: 9/13/2014
Views: 3973

https://s3.amazonaws.com/findit-pictures/19221/1689615_19221_120914015244

THE ECONOMICS OF BIOFUELS

The economics of biofuels. Aside from rejecting biofuel expansion and use for environmental reasons.

Released On: 9/13/2014
Views: 3819

Load More wait