Navigation Links
Old growth giants limited by water-pulling ability
Date:8/11/2008

and water can no longer be transported. With a 350-foot-long water column, there's a lot of tension on the water in the cells at the top of the tree, and a lot of force trying to get errant air bubbles to enter.

"Higher and higher in the tree, the valves are able to withstand more pulling force from the long heavy column of water before air bubbles can be sucked through," Lachenbruch said. "But the problem is that the valves become less efficient at letting water pass. The height at which no water would pass at all, according to our models, coincides the tallest records for Douglas-fir, about 350 to 400 feet."

Trees of that height were discovered in Washington and British Columbia in the late 19th and early 20th centuries. The tallest Douglas-fir today is a 326-foot-tall tree in Coos County, Oregon.

"As you go higher and higher in a Douglas-fir tree, it's almost like experiencing a drought," said Rick Meinzer, a Forest Service scientist at the Pacific Northwest Research Station. "And that's what we see at the tops of very tall trees. The foliage is struggling to get enough water and seems to be under drought stress. It's not unusual to see periodic die-back at the tops of very tall Douglas-fir trees that are near their height limits."

At a specific height determined by the physical structure of these pits and their membranes, the scientists discovered, the fierce resistance put up by the Douglas-fir to prevent any spread of air bubbles also prevents water from being pulled any higher. That is where it finally stops growing in height, no matter how favorable any other conditions might be, such as climate, soil or water availability.

The studies, Meinzer said, may improve our understanding of how trees grow in height and may be able to adapt to different environments, including their ability to deal with droughts or climate change.

Although height can be important in a competition for sunlight and photosynthesi
'/>"/>

Contact: Barb Lachenbruch
barb.lachenbruch@oregonstate.edu
541-737-4213
Oregon State University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008
2. [video] Michael DePasquale, CEO of BIO-key International, Inc., Discusses Q2 2008 Revenue Growth on WallSt.nets 3-Minute Press Show
3. BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008
4. Embryo biopsy does not affect early growth and risk of congenital malformations in PGD/PGS babies
5. Growth hormones link to starvation may be clue to increasing life span, researchers find
6. Blue light used to harden tooth fillings stunts tumor growth
7. Scientists find potential protein biomarkers for growth hormone
8. Synthetic cocoa chemical slows growth of tumors in human cell lines
9. NYU dental professor discovers biological clock linking tooth growth to other metabolic processes
10. T-cadherin affects blood vessel growth in breast cancer, hormone from fat cells may play a role
11. Faster koa tree growth without adverse ecosystem effects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... Miranda, a small, icy moon of Uranus, is one ... the solar system. Despite its relatively small size, Miranda ... that resulted in the formation of at least three ... coronae. , These coronae are visible in Miranda,s ... km across. Arden corona, the largest, has ridges and ...
(Date:9/18/2014)... Wis. No matter how many times it,s ... social, communicating creatures. , But by using ... organisms radically alter their behavior to suit their ... of them are present, and act accordingly. , ... millions, it may change from innocuous to pathogenic, ...
(Date:9/18/2014)... 18, 2014 -- Arizona turned its newborn screening program into ... short months, earning it the first-ever Newborn Screening Quality Award ... Dimes presented Will Humble, M.P.H., Arizona,s Department of Health Services ... Mr. Humble established a policy of full transparency for the ... blood samples to the lab for analysis, and set a ...
Breaking Biology News(10 mins):Miranda: An icy moon deformed by tidal heating 2Miranda: An icy moon deformed by tidal heating 3Miranda: An icy moon deformed by tidal heating 4Miranda: An icy moon deformed by tidal heating 5Miranda: An icy moon deformed by tidal heating 6Miranda: An icy moon deformed by tidal heating 7Researchers study vital 'on/off switches' that control when bacteria turn deadly 2Researchers study vital 'on/off switches' that control when bacteria turn deadly 3March of Dimes honors Arizona with first-ever newborn screening award 2March of Dimes honors Arizona with first-ever newborn screening award 3
... out closely related species and managing each type on ... management system. Some species, like the two types ... behavior that differentiation can be challenging. Conservation researchers at ... developed a mechanism for identifying these reclusive species from ...
... (Jan 3, 2012) Immune system abnormalities that mimic those ... amyloid precursor protein (APP), reports a research team from the ... Child Development Center. The study, conducted with mouse ... fragment circulating in the blood could explain the aberrations in ...
... Philadelphia, PA, January 3 For the ... Association for Echocardiography and the American Society of ... three-dimensional echocardiography (3DE). ,The EAE/ASE Recommendations for Image ... in the January 2012 issue of the ...
Cached Biology News:Autism may be linked to abnormal immune system characteristics and novel protein fragment 2EAE/ASE 3D echocardiography image acquisition recommendations 2
(Date:9/19/2014)... Jose, California (PRWEB) September 19, 2014 ... Nanotechnology and its potential to revolutionize the world ... agencies, multinational corporations and small start-ups. The early ... funded research projects largely due to the high ... investments. Government budgets earmarked for this evolving technology ...
(Date:9/19/2014)... , Sept. 19, 2014 Pfenex Inc. ... the development of high-value and difficult to manufacture proteins ... presenting at the 21 st Annual NewsMakers in ... . Bertrand Liang , chief executive officer ... development programs and business strategy on Friday, September 26, ...
(Date:9/19/2014)... -- Dublin ... the addition of the  "Micro Market Monitor : ...      (Logo: http://photos.prnewswire.com/prnh/20130307/600769) , , ,The ... segments in the chromatography market. The market was ... to reach $2.0 billion by 2019, at a ...
(Date:9/18/2014)... 18, 2014 HealthTronics, Inc ... interventional radiology products and services, announced that a ... and cryoablation) versus external beam radiotherapy (EBRT) is ... American Urological Association (MAAUA) Annual Meeting in Baltimore, ... Effectiveness of Cryosurgery and External Beam Radiation as ...
Breaking Biology Technology:Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 2Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 3Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 4Pfenex to Present at Upcoming Industry Conference on September 26 2Micro Market Monitor : Global Pre-packed Chromatography Columns 2HealthTronics Announces Data Comparing Cryotherapy Versus Radiation for Treating Prostate Cancer Poster Presented at the American Urological Association Regional Meeting 2
... MISSISSAUGA, ON, Aug. 5 /PRNewswire-FirstCall/ - YM BioSciences ... an oncology company that identifies,develops and commercializes differentiated ... hosted by Mr. David Allan, Chairman and CEO, ... the professional investment,community are invited to discuss the ...
... Aug. 5 Marinus Pharmaceuticals, a,developer of specialty ... has appointed John Krayacich as president,and chief executive ... company,s drug and business development for ganaxolone, an ... chelerythrine, a pre-clinical,schizophrenia candidate., Mr. Krayacich brings ...
... Aug. 5 NeoStem, Inc. (Amex: NBS ),announced today ... Coral Gables, a suburb of Miami, is targeted to open ... with CelVida,LLC. With the opening of this center, NeoStem has ... to a large U.S. market as well as a,growing sophisticated ...
Cached Biology Technology:NOTICE OF YM BIOSCIENCES CONFERENCE CALL TO DISCUSS PHASE II DATA FOR NIMOTUZUMAB IN METASTATIC COLORECTAL CANCER 2Marinus Pharmaceuticals Appoints John Krayacich as President and Chief Executive Officer 2Marinus Pharmaceuticals Appoints John Krayacich as President and Chief Executive Officer 3Marinus Pharmaceuticals Appoints John Krayacich as President and Chief Executive Officer 4NeoStem Forges Ahead in Its Plan to Open Adult Stem Cell Collection Centers in Key Locations that Can Serve as Hubs to Service Clients Nationwide 2NeoStem Forges Ahead in Its Plan to Open Adult Stem Cell Collection Centers in Key Locations that Can Serve as Hubs to Service Clients Nationwide 3
... genome-wide microRNA expression profiling and built ... microfluidic on-chip synthesis platform. These microarrays ... comprehensive microRNA Expression Profiling Service. ... microRNA Microarray contains all known fish ...
... unique quantitative and qualitative capabilities of the ... LC/MS/MS Systems with the new Tempo nano ... a rapid solution for high sensitivity validation ... extensive sample preparation with high instrument selectivity ...
... of Agilent analytical solutions is the 6890N ... (LAN) allows you to share business and ... decision making. Just as its 6890 GC ... and performance needed for research and method ...
... The 6820 GC system combines world-class performance ... QA/QC software, Agilents world-renowned support and columns, ... and supplies--a combination that lets you reach ... based on dependable data. The Agilent 6820 ...
Biology Products: