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Vegetation cover regulates the quantity, quality and temporal dynamics of dissolved organic carbon and nitrogen in Antarctic soils

Populations of the two native Antarctic vascular plant species (Deschampsia antarctica and Colobanthus quitensis) have expanded rapidly in recent decades, yet little is known about the effects of these expansions on soil nutrient cycling. We measured the concentrations of dissolved organic carbon (DOC) and nitrogen (DON), amino acids and inorganic N in soils under these two vascular plant species, and under mosses and lichens, over a growing season at Signy Island in the maritime Antarctic. We recorded higher concentrations of nitrate, total dissolved nitrogen, DOC, DON and free amino acids in soil under D. antarctica and C. quitensis than in lichen or moss dominated soils. Each vegetation cover gave a unique profile of individual free amino acids in soil solution. Significant interactions between soil type and time were found for free amino acid concentrations and C/N ratios, indicating that vascular plants significantly change the temporal dynamics of N mineralization and immobilization. We conclude that D. antarctica and C. quitensis exert a significant influence over C and N cycling in the maritime Antarctic, and that their recent population expansion will have led to significant changes in the amount, type and rate of organic C and N cycling in soil. read more

Fosu-Mensah: I’ll give my all to make it with Man Utd

first_img Loading… “So, yeah, I’m definitely eager to come back and to do well and to help the team and to give my all, my heart for this great club. “My goal is to be a regular for the club, to win so many trophies for the club, to have memorable experiences with this club. That’s the goal. read also:Here’s how Man Utd could line-up for FA Cup tie “I think that’s everyone’s goal who plays in the team for Manchester.” FacebookTwitterWhatsAppEmail分享 Timothy Fosu-Mensah believes he can make it at Manchester United. Fosu-Mensah has not played for United since the final day of the 2016-17 season against Crystal Palace, but is set to be given another chance at the club after they extended his contract to 2021 earlier this year. “Who doesn’t want to play for United?” Fosu-Mensah told the PA news agency.Advertisement Promoted ContentCouples Who Celebrated Their Union In A Unique, Unforgettable Way6 Of The Best 90s Shows That Need To Come Back ASAP9 Iconic Roles That Could Have Been Played By Different ActorsThe Models Of Paintings Whom The Artists Were Madly In Love With10 Risky Jobs Some Women Do8 Ways Drones Will Automate Our FutureThe Very Last Bitcoin Will Be Mined Around 2140. Read More6 Ridiculous Health Myths That Are Actually True7 Non-Obvious Things That Damage Your PhoneThe 10 Best Secondary Education Systems In The World6 Extreme Facts About HurricanesPlaying Games For Hours Can Do This To Your Bodylast_img read more

Speedway Motors brings new look to latest season of IMCA support

first_imgThe Lincoln, Neb., high performance parts manufacturer, retailer and distribu­tor is the sanctioning body’s longest tenured sponsor, tracing its association with IMCA to the 1950s. The Speedway Motors website is www.speedwaymotors.com. More information is also available by calling 800 979-0122 and on Face­book. “We’re proud of our long relationship with IMCA and we’re grateful for the support they’ve given us all these years,” Speedway Motors President Clay Smith said. “Our goal at Speedway Motors is to keep racing safe, affordable and fun, and our strong partnership with IMCA allows us to support today’s racers and for generations of racers to come.” Speedway Motors is in the second year of its latest five-year market­ing agreement with IMCA. New this year are $100 gift certificates for IMCA RaceSaver Sprint Car track and special series champions. Highlighting the current pact, Speedway Motors renews its title sponsorship role of IMCA Weekly Racing for an 12th consecutive season and returns as title sponsor of Super Nationals, to be held Sept. 2-7 at Boone Speedway, for the 24th consecutive year. “The new Speedway Motors logo has been a huge undertaking to say the least, and we’ve been in communication with them throughout the process to ensure the IMCA Speedway Motors Weekly Racing logo was in step with their new design,” said IMCA Marketing Director Kevin Yoder. “A brand new line of apparel is available to all IMCA sanctioned tracks and crews across the country will be proudly wearing the new design during the 2019 racing season.” For the fourth straight season, drivers winning national championships in all eight sanctioned divi­sions receive helmets. And first-year competitors filling out and returning rookie application forms to the IMCA home of­fice get $100 discount certificates, along with a T-shirt and decal from Speedway Motors following ini­tial rookie season fea­ture wins. LINCOLN, Neb. – The company synonymous with speed continues its support for IMCA and its 9,000-plus drivers in 2019. Speedway Motors unveiled its new logo in January, in conjunction with its What Moves You social me­dia campaign. Speedway Motors has renewed a program benefitting more than 200 tracks in the United States and Canada by providing jackets, promoter and tech official shirts and discounts on tech inspec­tion equipment, flags and signage to help those facilities defray costs of their weekly programs, plus decals, driver’s suit patches and feature winner hats. The Speedway Motors program again includes post-season awards in five divisions: Top eligible finishers in Modified, Stock Car and Hobby Stock regional standings, and in Northern SportMod and Southern SportMod national standings, all re­ceive a pair of TruCoil springs. Drivers in all five of those divisions are required to fill out and return the sign-up form soon to be available online to become eligible for those contingencies.last_img read more