0000000000589441

AUTHOR

Jevgenija ŅEčajeva

showing 2 related works from this author

Jūras piekrastes augu dīgšanas ekofizioloģija: sēklu miera periods un vides faktoru ietekme

2012

Darba mērķis ir raksturot dažādu piekrastes biotopu augu sēklu miera periodu un dažādu vides faktoru ietekmi uz to dīgšanu. Augu sēklas ievāca Baltijas jūras piekrastē (Kurzeme) un Rīgas jūras līča piekrastē. Vienā no diedzēšanas eksperimentiem izmantoja sēklas no Millenium Seed Bank (RBG Kew, Lielbritānija) kolekcijas. Diedzēšanas eksperimentus veica LU Bioloģijas fakultātē no 2005. līdz 2009. gadam un MSB laboratorijā 2009. gadā. Ir noteikts un raksturots sēklu organiskā miera perioda (OMP) veids vairākām piejūras mitrāju un kāpu augu sugām, kā arī raksturota NaCl ietekme uz šo sugu sēklu dīgšanu. Juncus balticus un Triglochin maritima sēklām ir salīdzināta NaCl un polietilēnglikola (PEG)…

Augu fizioloģijaDzīvās dabas zinātnesBioloģija
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Ultraviolet radiation accelerates photodegradation under controlled conditions but slows the decomposition of senescent leaves from forest stands in …

2019

Depending on the environment, sunlight can positively or negatively affect litter decomposition, through the ensemble of direct and indirect processes constituting photodegradation. Which of these processes predominate depends on the ecosystem studied and on the spectral composition of sunlight received. To examine the relevance of photodegradation for litter decomposition in forest understoreys, we filtered ultraviolet radiation (UV) and blue light from leaves of Fagus sylvatica and Bettda pendula at two different stages of senescence in both a controlled-environment experiment and outdoors in four different forest stands (Picea abies, Pagus sylvatica, Acer platanoides, Betula pendula). Co…

0106 biological sciences0301 basic medicineCanopyUltraviolet RaysPhysiologyUV-B RADIATIONPlant ScienceForestsANTHOCYANINS01 natural sciencesUV radiationBOREAL FOREST03 medical and health scienceschemistry.chemical_compoundFagus sylvaticaPhotodegradationGeneticsPhotodegradationEcosystemFinlandComputingMilieux_MISCELLANEOUS11832 Microbiology and virologyFlavonoidsSunlight[SDV.EE]Life Sciences [q-bio]/Ecology environment4112 ForestryPhotolysisbiologyChemistryTEMPERATEPLANT LITTERPicea abies15. Life on landPlant litterbiology.organism_classificationPhenolic compoundsUnderstorey light environmentSODANKYLAPlant LeavesHorticultureLIGHT030104 developmental biology13. Climate actionBetula pendulaChlorophyllPATTERNS1182 Biochemistry cell and molecular biologyLEAF-LITTER DECOMPOSITION010606 plant biology & botany
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