Rdeča tla v Beli krajini

magistrsko delo

Sara Mavsar (Author), Helena Grčman (Mentor), Nina Zupančič (Co-mentor)

Abstract

Površje Bele krajine predstavlja nizki kraški ravnik, ki je prekrit z debelo plastjo aluvialne rdeče gline. Na osnovni geološki karti Slovenije 1 : 100 000 so na tem območju opredeljene rdeče boksitne gline in terra rossa. Podatkov o rdečih tleh v Beli krajini ni veliko, opisan je le en talni profil. Namen magistrske naloge je določiti pedološke in geokemične parametre rdečih tal v Beli krajini in jih primerjati z izpranimi tlemi iz istega območja in s terra rosso s Krasa. Izkopali smo dva profila rdečih tal (P01, P02), podatke o dveh izpranih talnih profilih (P03, P04) in dveh profilih terra rosse (P05, P06) smo pridobili iz raziskave Roka Turniškega. Opravili smo standardno pedološko analizo na ICPVO Ljubljana, v Kanadi (laboratorij Bureau Veritas) so z metodo ICP-MS analizirali vsebnost glavnih oksidov. Vzorce smo analizirali tudi za prosto oksidno železo (Fed) po ditionit citratni metodi. Z Mann-Whitneyevim testom smo primerjali rdeča tla z izpranimi in s terra rosso ter ugotovili, da rdeča tla v primerjavi z izpranimi vsebujejo več gline, Al2O3, Fe2O3, Fed, in večje Fed/Fet razmerje, manj finega melja, skupnega melja, manjše CN razmerje, manj izmenljivih Na+ in H+, manjše vsebnosti SiO2, MgO, K2O in manjša molekularna razmerja SiO2 : Al2O3, SiO2 : Fe2O3 in SiO2 : R2O3. V primerjavi s terra rosso imajo rdeča tla večje vsebnosti izmenljivega Mg2+, Al2O3, Fe2O3 , TiO2, Fed, večje Fed/Fet razmerje, manj izmenljivih Na+ in H+, manjšo KIK, vsebnost SiO2 in manjša molekularna razmerja SiO2 : Al2O3, SiO2 : Fe2O3 in SiO2 : R2O3. Glede na izračuna kemičnega indeksa spremenjenosti (CIA) in kemičnega indeksa preperevanja (CIW) ugotavljamo, da so rdeča tla bolj preperela kot izprana tla in terra rossa. Po stopnji preperelosti rdečim tlem sledi terra rossa, tem pa izprana tla. Profil P01 se po WRB uvršča v referenčno skupino Akrisols, P02 in P06 Luvisols, P03, P04 in P05 Alisols.

Keywords

Bela krajina;rdeča tla;rdeče gline;izpiranje;prosto oksidno železo;preperevanje;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[S. Mavsar]
UDC:	631.445.63:631.432.3:631.41(497.4-12)(043.2)
COBISS:	9300345
Views:	597
Downloads:	231
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Red soil in Bela krajina
Secondary abstract:	Bela krajina represents a low karst valley, which is protected by a thick layer of red clay. Basic geological map of Slovenia 1 : 100 000 reports appearance of terra rossa and red bauxite clays in Bela krajina. There is not much data on red soil in Bela krajina, except for one representative profile. The aim of master's thesis is to determine the pedological and geochemical properties of the Bela krajina red soil and its comparison with Bela krajina leached soil and terra rossa in Kras region. Two representative locations were selected for the sampling of red soil (P01, P02), whereas data for two leached and two terra rossa profiles were obtained from Rok Turniški research. A standard pedological analysis was performed at ICPVO Ljubljana, and ICP-MS for major oxides content at Bureau Veritas laboratory in Canada. Samples were also analyzed for free oxide iron (Fed) by dithionite-citrate method. Mann-Whitney test was applied for comparison of red soil to leached soil and to terra rossa. Results showed that red soil contain more clay, Al2O3, Fe2O3, Fed, and has bigger Fed/Fet ratio, less fine silt, total silt, smaller CN ratio, less exchangable Na+ and H+, SiO2, MgO, K2O and smaller molecular ratios SiO2 : Al2O3, SiO2 : Fe2O3 in SiO2 : R2O3. Compared to terra rossa, red soil contain more exchangable Mg2+, Al2O3, Fe2O3, TiO2, Fed, bigger Fed/Fet ratio, less exchangabe Na+ and H+, smaller CEC, less SiO2 and smaller molecular ratios SiO2 : Al2O3, SiO2 : Fe2O3 in SiO2 : R2O3. According to chemical index of alteration (CIA) and chemical index of weathering (CIW) we can conclude that the red soil is the most weathered compared to leached soil and terra rossa. By the intensity of weathering red soil is followed by terra rossa and then by leached soil. Profile P01 is classified as Acrisol, P02 and P06 as Alisols, P03, P04 and P05 as Luvisols.
Secondary keywords:	red soil;red clay;leaching;free oxide iron;weathering;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za agronomijo
Pages:	XI, 51 f., [22] f. pril.
ID:	11230351