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ID number:876477
 
Author:
Evaluation:
Published: 07.12.2007.
Language: Latvian
Level: Elementary school
Literature: 4 units
References: Not used
Extract

Kas ir purvs?

Purvs ir zemes virsmas nogabals, kam raksturīgs:
patstāvīgs vai ilgstošs periodisks mitrums;
specifiska augu valsts;
kūdras uzkrāšanās.

Purvainu vietu droši var saukt par purvu tikai tad, ja tajā ir vismaz 30 centimetrus biezs kūdras slānis. Taču, tā kā biotopus klasificē pēc augu sabiedrībām, tad par purvu varam saukt ikvienu tādu vietu, kurā ir purvam raksturīgā augu valsts.

Purvu veidošanās
1.pārpurvojoties sauszemei;

2.pāraugot un aizaugot ūdenstilpēm.…

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