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Deževniki (Lumbricidae) kot kazalci kakovosti tal
Ceglar, Urša (Author), Suhadolc, Marjetka (Mentor) More about this mentor... This link opens in a new window

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Abstract
Deževniki so znani kot »ekosistemski inženirji« v tleh, ki imajo pomembno vlogo pri razgradnji in kroženju organskih snovi, izboljšujejo strukturo, poroznost in zračnost tal ter infiltracijo vode. Vplivajo tudi na dostopnost in dinamiko hranil ter na raznolikost in številčnost flore in favne tal. Geografska lega, sezonske in klimatske razlike in pa raba tal pomembno vplivajo na številčnost, porazdelitev in dejavnost deževnikov. Na primer, suho in toplo mediteransko podnebje zmanjšuje številčnost deževnikov, z oceno lokalne populacije daleč pod 50 ind./m2, v primerjavi z zmernim celinskim podnebjem, kjer je število deževnikov lahko tudi do 500 ind./m2. Velik vpliv ima tudi matična podlaga tal in pH. Večina vrst deževnikov uspeva pri pH od 6 do 7. Deževniki se odzivajo na različne kmetijske prakse. Mehanske motnje spremenijo okolje, v katerem deževniki živijo. Ti učinki vključujejo spremembo temperature, vsebnost vlage, vsebnost organske snovi in dostopnost hrane v tleh. Deževniki so občutljivi tudi na različna okoljska onesnažila, kot so fitofarmacevtska sredstva in težke kovine. Veliko študij zato deževnike predlaga kot primerne biotske kazalce pri ocenjevanju potencialnih ohranitvenih kmetijskih praks, kot tudi za ocenjevanje onesnaževanja. Za celovito interpretacijo in oceno kakovosti tal je vzporedno pomembno spremljati tudi fizikalno-kemijske kazalce.

Language:Slovenian
Keywords:kakovost tal, deževniki, Lumbricidae, organska snov, lastnosti tal
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2017
Publisher:[U. Ceglar]
UDC:631.4:595.14:591.5(043.2)
COBISS.SI-ID:8822393 Link is opened in a new window
Views:724
Downloads:326
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Secondary language

Language:English
Title:Earthworms (Lumbricidae) as indicators of soil quality
Abstract:
Earthworms have been referred as “ecosystem engineers”, because they can influence organic matter decomposition, carbon and nitrogen content of soils, soil aggregate structure, porosity and water infiltration. They also affect abundance and biodiversity of soil fauna and flora. Geographical location, seasonal and climatic differences and land use have a significant impact on the abundance, distribution and activity of earthworms. For example, the Mediterranean climate strongly affects the abundance of earthworms, with a local population far below 50 ind./m2, in comparison with moderate continental climate, where number of earthworms can be up to 500 ind./m2. A big influence has also parent material and soil pH. Most types of earthworms grow at pH 6 to 7. Agricultural production systems have a profound effect on earthworm populations, because mechanical disturbance changes the environment in which they live. These effects include changes in soil temperature, moisture content, soil organic matter content and the availability of food. Earthworms are also sensitive to a variety of environmental pollutants such as pesticides and heavy metals. That is why earthworms are suggested as potential indicators of the sustainability of agricultural practices and also for pollution assessment. For complete interpretation and assessment of soil quality, it is also important to monitor physico-chemical indicators is well.

Keywords:soil quality, earthworms, Lumbricidae, organic matter, soil properties

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