CO2 e siccità mettono a rischio le coltivazioni

coltivazioni-siccita-co2La sicurezza degli approvvigionamenti alimentari mondiali è duramente messa alla prova dai cambiamenti climatici in atto. Le vecchie piante non sono infatti abituate a temperature così torride e la mancanza di acqua, con l’avanzare della desertificazione, non fa che rendere ancora più arida la terra coltivabile. Motivo per il quale gli scienziati si stanno adoperando al fine di trovare piante più resistenti al riscaldamento terrestre e meno sensibili all’alta quantità di CO2 immessa nell’atmosfera dalle attività umane e non.

Un nuovo clima esige nuove colture. Continuare ad ignorare il problema potrebbe risultare pericolosamente deleterio, dal momento che gli studiosi hanno scoperto che le piante cresciute in ambienti aridi e/o inquinati, con alti tassi di CO2, avrebbero meno principi nutritivi rispetto alle altre e valori elevati di sostanze tossiche per l’organismo. Un recente studio, effettuato da un team di ricercatori della Monash University di Victoria (Australia), ha infatti individuato un incremento di composti tossici e una diminuzione del contenuto proteico nelle piante coltivate in territori con alto tasso di inquinamento. Gli studiosi hanno inoltre notato che la resa delle coltivazioni in condizioni di siccità e in aree fortemente interessate dai cambiamenti climatici era nettamente inferiore a quella ottenuta in condizioni normali.
coltivazioni-maniocaLa ricerca, presentata dal dottor Gleadow Ros nel corso del Society for Experimental Biology Annual Meeting svoltosi a Glasgow il 29 giugno scorso, ha dimostrato che la concentrazione di alcune sostanze tossiche responsabili del rilascio di cianuro di idrogeno, è aumentata nelle piante coltivate in corrispondenza di elevate quantità di CO2. Questo dato è stato aggravato dal fatto che il contenuto proteico è diminuito, rendendo le piante più tossiche, dal momento che la capacità degli erbivori di abbattere i livelli di cianuro dipende in gran parte dall’ingestione di una quantità sufficiente di proteine.
I dati hanno inoltre dimostrato che la manioca, un alimento base delle colture nelle regioni tropicali e subtropicali, data la sua tolleranza delle condizioni aride, è soggetta a riduzioni di resa in presenza di alti tassi di CO2. Secondo gli esperti se i livelli di CO2 continueranno ad aumentare:

Abbiamo bisogno di prepararci per la prevista riduzione del valore nutrizionale di molte piante, fenomeno che sconvolgerà gli equilibri di sussistenza di intere popolazioni, già oggi in gravi difficoltà a causa della penuria di cibo.

[Fonte: Society for Experimental Biology (2009, June 30). New Crops Needed For New Climate. ScienceDaily. Retrieved July 1, 2009, from http://www.sciencedaily.com­ /releases/2009/06/090629081127.htm]

39 commenti su “CO2 e siccità mettono a rischio le coltivazioni”

  1. Possedere il clima entro il 2020 documento della NASA il clima lo possiedono gia’ cosi’ si potranno fare entrare su larga scala gli ogm , che non risolveranno la fame nel mondo , anzi toglieranno la salute e la vita a molte persone , ma il problema e’ risolto siamo troppi in questo mondo , bisogna escogitare qualcosa
    quindi far credere che e’ per il nostro bene , che c’e’ chi pensa a noi , e come ci pensa !

    Rispondi
  2. The new Zune browser is surprisingly good, but not as good as the iPod’s. It works well, but isn’t as fast as Safari, and has a clunkier interface. If you occasionally plan on using the web browser that’s not an issue, but if you’re planning to browse the web alot from your PMP then the iPod’s larger screen and better browser may be important.

    Rispondi
  3. Hello there, just became aware of your blog through Google, and found that it’s truly informative. I’m gonna watch out for brussels. I will be grateful if you continue this in future. A lot of people will be benefited from your writing. Cheers!

    Rispondi
  4. I like the helpful information you provide in your articles. I’ll bookmark your weblog and check again here frequently. I am quite certain I will learn many new stuff right here! Good luck for the next!

    Rispondi
  5. Thanks for another wonderful post. Where else may just anybody get that type of information in such a perfect manner of writing? I have a presentation subsequent week, and I am on the search for such info.

    Rispondi
  6. IMSC SEO is a Singapore SEO Company. They provide comprehensive Singapore SEO services to help SG businesses to gain traffic from search engine. Their SEO agency has many years of experiences working with overseas companies on more competitive grounds. They are the best seo company in Singapore you can find. Their SEO expert and consultant understand exactly what search engine optimization your company need to gain search engine traffic.

    http://www.shortmyurls.com/imsc-home-comment-general

    Rispondi
  7. cheers for such a brilliant website. Where else could someone get that kind of information written in such a perfect way? I have a presentation that I am presently working on, and I have been on the watch out for such information.

    http://repairloader.net/

    Rispondi
  8. Great – I should definitely pronounce, impressed with your site. I had no trouble navigating through all tabs as well as related information ended up being truly easy to do to access. I recently found what I hoped for before you know it at all. Reasonably unusual. Is likely to appreciate it for those who add forums or something, website theme . a tones way for your customer to communicate. Nice task.

    Rispondi
  9. IMSC SEO is a Singapore SEO Company. They provide comprehensive Singapore SEO services to help SG businesses to gain traffic from search engine. Their SEO agency has many years of experiences working with overseas companies on more competitive grounds. They are the best seo company in Singapore you can find. Their SEO expert and consultant understand exactly what search engine optimization your company need to gain search engine traffic.

    http://www.shortmyurls.com/imsc-services-comment-exact

    Rispondi
  10. The Zune concentrates on being a Portable Media Player. Not a web browser. Not a game machine. Maybe in the future it’ll do even better in those areas, but for now it’s a fantastic way to organize and listen to your music and videos, and is without peer in that regard. The iPod’s strengths are its web browsing and apps. If those sound more compelling, perhaps it is your best choice.

    Rispondi
  11. IMSC SEO is a Singapore SEO Company. They provide comprehensive Singapore SEO services to help SG businesses to gain traffic from search engine. Their SEO agency has many years of experiences working with overseas companies on more competitive grounds. They are the best seo company in Singapore you can find. Their SEO expert and consultant understand exactly what search engine optimization your company need to gain search engine traffic.

    http://www.shortmyurls.com/imsc-home-comment-general

    Rispondi
  12. The new Zune browser is surprisingly good, but not as good as the iPod’s. It works well, but isn’t as fast as Safari, and has a clunkier interface. If you occasionally plan on using the web browser that’s not an issue, but if you’re planning to browse the web alot from your PMP then the iPod’s larger screen and better browser may be important.

    Rispondi
  13. Very nice post. I just stumbled upon your blog and wished to say that I have really enjoyed surfing around your blog posts. After all I will be subscribing to your rss feed and I hope you write again soon!

    Rispondi
  14. I like the valuable information you provide in your articles. I’ll bookmark your weblog and check again here regularly. I am quite certain I’ll learn many new stuff right here! Good luck for the next!

    Rispondi
  15. I am very happy to read this. This is the type of manual that needs to be given and not the random misinformation that’s at the other blogs. Appreciate your sharing this greatest doc.

    Rispondi
  16. Just desire to say your article is as surprising. The clarity in your post is simply cool and i could assume you are an expert on this subject. Fine with your permission let me to grab your feed to keep updated with forthcoming post. Thanks a million and please keep up the rewarding work.

    Rispondi
  17. hi!,I love your writing very so much! percentage we keep up a correspondence more about your article on AOL? I need an expert on this space to unravel my problem. May be that’s you! Having a look forward to see you.

    Rispondi

Lascia un commento

This site uses Akismet to reduce spam. Learn how your comment data is processed.