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kāpēc izzūd meža silpurene?
22, 2007, 20:50signe
signej at one.lv
http://google.lv
:-:

    labdien ! vai nezinat kādēļ izzūd meža silpurene?
    22, 2007, 20:52paula
    paula zigure
    http://paula.zigure.bloogsoft.com

    Nav tā, ka meža silpurene mūsu acu priekšā ļoti strauji izzūd; taču tā ir diezgan reta, un to apdraud dažādas cilvēka darbības. Piemēram:
    - plūkšana, izrakšana (šis augs ir dekoratīvs);
    - piemērotu dzīvotņu iznīcināšana (tā aug saulainos priežu mežos ar nabadzīgu augsni; šādus mežus cilvēki cērt gan koksnes dēļ, gan lai veidotu mājvietas un atpūtas vietas);
    - piemērotu dzīvotņu aizaugšana. Pēdējais ir diezgan sarežģīts jautājums. Priežu meži aizaug ar citām sugām eitrofikācijas (augsnes bagātināšanās ar barības vielām) dēļ. Priežu meži arī kļūst par egļu mežiem dabiskās sukcesijas ceļā. Tāpēc dažviet silpureņu mežos nepieciešams šai sugai palīdzēt, ar dažu koku izciršanas palīdzību padarot šos mežus saulainākus.


    ja tev pavisam nopietni vajag, griezies pie Teiču rezervāta botāniķiem; tur šī suga ir īpaši pētīta.
    pameklē

    23, 2007, 8:27Vija
[Your answers and comments can be added here]

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