HOME >> BIOLOGY >> NEWS
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
cdybas@nsf.gov
703-292-8070
National Science Foundation
12-Dec-2002


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:
*Name:
*Comment:
*Email:
TAG: Increase rainfall variability related global climate change

(Date:6/24/2015)... 2015 Research and ... the "Huawei Ascend Mate 7 Fingerprint Sensor ... offering. Huawei,s technological choice for the ... than Apple,s and Samsung,s one. The Ascend Mate ... Fingerprint Cards, a main actor in capacitive sensing ...
(Date:6/23/2015)... June 23, 2015  Crossmatch™, a leading ... today announced enhanced functionality of its DigitalPersona ... The enhancements build on the native flexibility ... Altus platform and provide expanded mobile credential ... In today,s environment of increasing cyber-attacks and ...
(Date:6/17/2015)... 2015  Synaptics Inc. (NASDAQ: SYNA ), ... that Xiaomi, one of the world,s largest mobile ... ® family of capacitive touchscreen solutions and ... for its latest smartphones, the Xiaomi Mi Note ... in-cell display solutions and DDICs in discrete display ...
Breaking Biology News(10 mins):Huawei Ascend Mate 7 Fingerprint Sensor - Reverse Costing Analysis 2Crossmatch Releases Enhanced DigitalPersona Altus Advanced Authentication Functionality 2Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 2Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 3
(Date:7/2/2015)... -- Amici Procurement Migrates to the Cloud ... has chosen Microsoft Cloud Solution Provider iomart ...      (Logo: http://photos.prnewswire.com/prnh/20121126/579634) , ... the bio-tech sector with a unique procurement service, helping ... help them obtain best value. Its IT platform hosts ...
(Date:7/2/2015)... ... July 02, 2015 , ... ... of surgical instruments in Orthopedics, announced today the acquisition of Turner Medical, ... largest provider of surgical instruments to the Spine Industry. The acquisition of Turner ...
(Date:7/1/2015)... and PARIS , July ... and Genective, key developer of biotech crops, today ... of new generations of insect control traits. ... to counter the realities of advancing insect resistance. ... AgBiome,s unique insect control technology with Genective,s capability ...
(Date:7/1/2015)... ... , ... The next-generation sequencing (NGS) clinical market is poised for huge growth ... BCC Research reveals in its new report that the market drivers of this vibrant ... need for better diagnostics as part of a molecular diagnostics trend. , The global ...
Breaking Biology Technology:Biotech Procurement Company Moves to Office 365 with iomart 2In'Tech Medical Acquires Turner Medical to Become a World Leader in Orthopedic Contract-Manufacturing 2In'Tech Medical Acquires Turner Medical to Become a World Leader in Orthopedic Contract-Manufacturing 3AgBiome and Genective collaborate to create novel insect-resistant crops 2NGS-Based Diagnostics, the ‘Must-Have Platform’, Sends Market Segment CAGRs Soaring According to BCC Research 2NGS-Based Diagnostics, the ‘Must-Have Platform’, Sends Market Segment CAGRs Soaring According to BCC Research 3
Cached News: