Increase in rainfall variability related to global climate change

a future with more climate extremes. In the four-year field study, the researchers altered rainfall variability by increasing the amount of precipitation that falls in one storm, and lengthened the periods of time between rainfalls by 50 percent. That effectively increased the severity of dry periods between storms without altering the total amount of precipitation received during a growing season.

"When these native grassland plots, exposed to more variable rainfall patterns, were compared with plots that received rainfall in a natural pattern, the overall growth of all plants decreased," said Knapp. "More variable rainfall patterns led to lower amounts of water in the soil in the upper 30 centimeters. Since this is the soil depth where most plant roots occur, and where important soil microbes are most abundant, grasses there were water-stressed and the activity of below-ground organisms was reduced."

In contrast, said Collins, "the diversity of plants in plots with greater variability in rainfall patterns increased." Collins cites two possible explanations for this finding: "A high degree of variability in resources can lead to a greater number of co-existing species. Or reduced total productivity may have allowed less common species to increase in abundance." Regardless of the mechanism, said Collins, these results show that plant community structure can be significantly changed, and the cycling of carbon slowed, in as little as four years when grasslands are exposed to a more variable climate.

Concerns about predicted climate changes resulting from human activities often focus on the effects of increases in average air temperatures or changes in average precipitation amounts. But widely used climate models also predict increases in climate extremes, said Knapp, such as more frequent large rainfall events or more severe droughts. "It's important that we look at variability in a new way: not only from year to year or decade to deca

Contact: Cheryl Dybas
National Science Foundation

Page: 1 2 3

Related biology news :

1. Increased atmospheric carbon dioxide promotes algal growth
2. Increased temperature may prevent winter flounder from rebounding in east coast estuaries
3. Get your blood moving: Increased blood flow could lead to healthier blood vessels
4. Increased bone mass in a calcitonin knockout mouse full of surprises
5. Increased fiber curbs appetite in women
6. Increased CO2 levels are mixed blessing for agriculture
7. Increased awareness of stroke symptoms could dramatically reduce stroke disability
8. Increased use of chemicals in agriculture worldwide seen as major environmental threat
9. Increased consumption of soy protein may help lower cholesterol
10. Increased consumption of whole grain foods associated with decreased risk of stroke
11. Increased risk of wheeze and asthma in young children whose mothers smoke during the pregnancy

Post Your Comments:

(Date:10/8/2015)... , 8. Oktober 2015 Die ... tätiges Unternehmen des Bereiches Tracking, hat heute ... der Gefängnisbehörde Virginias (Department of Corrections – ... Überwachungsdienste für alle Strafen geliefert werden, die ... , Präsident für den Amerikanischen Kontinent der ...
(Date:10/7/2015)... Connecticut , October 7, 2015 ... authentication company focused on the growing mobile commerce market ... Stanley E. Washington , former long- term executive ... of Directors. --> NXTD ) ("NXT-ID" or ... growing mobile commerce market and creator of the Wocket® ...
(Date:10/5/2015)... http://soundview.co ) releases ... (NASDAQ: NXTD ), a biometric authentication company focused ... http://soundview.co ) releases the following market and ... a biometric authentication company focused on the growing mobile ... http://soundview.co ) releases the following market and ...
Breaking Biology News(10 mins):
(Date:10/12/2015)... 12 de octubre de 2015 El 8 ... a un récord en el congreso con su declaración ... la International Plasma Awareness Week (IPAW), que se celebrará ... patrocinada por la Plasma Protein Therapeutics Association ... , Aumentar la concienciación mundial acerca de ...
(Date:10/12/2015)... Oct. 12, 2015  Patara Pharma, a clinical-stage ... inflammatory diseases and conditions, today announced the closing ... financing. Concurrent with the close of its sale ... Loan and Security Agreement with Silicon Valley Bank ... million. Patara will use the funds from the ...
(Date:10/12/2015)... , October 12, 2015 DorlandsOnline.com ... print version for enriched online experience --> ... alternative to print version for enriched online experience ... multi media alternative to print version for enriched ... provider of scientific, technical and medical information products and ...
(Date:10/12/2015)... (PRWEB) , ... October 12, 2015 , ... ... today that Dr. Srini Srinivasan, has joined the firm as a Premier Expert ... professional stature enable them to bring extraordinary value to the company's clients. ...
Breaking Biology Technology:
Cached News: