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Derviniai augalai

Derviniais augalais vadiname dervas sintetinančius medžius, krūmus ir žolinius augalus. Dervos augaluose kaupiasi stiebe, lapuose, žievėje, sėklose. Dervas augalai išskiria natūraliai arba juos pažeidus. Dažniausiai dervos turi antiseptinių medžiagų, ore ir šviesoje kietėja, taip apsaugodamos augalą nuo kenkėjų ir ligų.

pušų sakų rinkimasPagal konsistenciją natūralios dervos skirstomos į skystąsias, minkštąsias ir kietąsias. Natūralios dervos ir jų produktai naudojami medicinoje, parfumerijoje, izoliacinių medžiagų, lakų, kitų dirbinių gamyboje.

Svarbiausi Lietuvoje augantys derviniai augalai yra pušys, eglės, maumedžiai ir kadagiai, iš kurių sakų gaminamas terpentinas, medicininis balzamas ir kiti gaminiai. Iš žolinių augalų dervas kaupia šventagaršvės, žiognagės, amalai, pipirlapė, tamsioji plautė, ajerai, dirvoninis dobilas, islandinė kerpena ir kiti.

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