CCL

Összesen 4 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM112775
035-os BibID:(cikkazonosító)165879
Első szerző:Hateffard, Fatemeh (digital soil mapping)
Cím:Applicability of machine learning models for predicting soil organic carbon content and bulk density under different soil conditions / Fatemeh Hateffard, Gábor Szatmári, Tibor József Novák
Dátum:2023
ISSN:2300-4975
Megjegyzések:A reliable overview of the spatial distribution of soil properties is a straightforward approach in soil policies and decision-making. Soil organic carbon (SOC) content, SOC stock and bulk density (BD) directly affect soil quality and fertility. Therefore, an accurate assessment of these crucial soil parameters is required. To do this, we used machine learning algorithms (MLAs) including, multiple linear regression (MLR), random forest (RF), artifi cial neural network (ANN), and support vector machine (SVM) with the help of environmental covariates to predict SOC content, BD, and SOC stock. The study was conducted in two different areas, Látókép and Westsik (East Hungary), both experimental research fi elds but different from physio geographic points of view. Thirty topsoils (0?10 cm) samples were collected for each study area using conditioned Latin Hypercube Sampling strategy. Environmental covariates were extracted from a digital elevation model (DEM) and satellite images based on the representation of soil forming factors. We validated the results by randomly splitting the dataset into a train (two-third) and test (one-third) and calculated the root mean square error and R2. Our results showed that RF provided the most accurate spatial prediction with R2 of about 80% for each soil property in both study areas. This study highlighted the importance of terrain attributes (including plan and profi le curvature, elevation and valley depth) and NDVI derived from satellite images in presenting a spatial distribution of selected soil properties in two different areas. We conclude that comparing these methods can help to determine the most accurate maps under diverse geographical conditions and heterogeneities at different scales, which can be used in precision soil quality management.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Digital soil mapping
Soil variations
Machine learning
Soil properties
Random forest
Megjelenés:Soil Science Annual. - 74 : 1 (2023), p. 1-11. -
További szerzők:Szatmári Gábor Novák Tibor (1973-) (geográfus)
Pályázati támogatás:TKP2021-NKTA-32
FIKP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM104109
035-os BibID:(WoS)000508228300007 (Scopus)85079414794
Első szerző:Kabaa, Cezary
Cím:Suitability of World Reference Base for Soil Resources (WRB) to describe and classify chernozemic soils in Central Europe / Cezary Kabala, Przemyslaw Charzyñski, Szabolcs Czigány, Tibor J. Novák, Martin Saksa, Marcin Switoniak
Dátum:2019
ISSN:2300-4975
Megjegyzések:Chernozemic soils are distinguished based on the presence of thick, black or very dark, rich in humus, well-structural and base-saturated topsoil horizon, and the accumulation of secondary carbonates within soil profile. In Central Europe these soils occur in variable forms, respectively to climate gradients, position in the landscape, moisture regime, land use, and erosion/ accumulation intensity. "Typical" chernozems, correlated with Calcic or Haplic Chernozems, are similarly positioned at basic classification level in the national soil classifications in Poland, Slovakia and Hungary, and in WRB. Chernozemic soils at various stages of their transformation are placed in Chernozems, Phaeozems or Kastanozems, supplied with respective qualifiers, e.g. Cambic, Luvic, Salic/Protosalic, Sodic/Protosodic etc. Some primeval Chernozems thinned by erosion may still fulfil criteria of Chernozems, but commonly are shifted to Calcisols. Soils upbuilt (aggraded) with colluvial additions may also retain their original placement in Chernozems, getting supplementary qualifier Colluvic. "Hydromorphic" chernozemic soils, in many CE systems are placed as separate soil type ("czarne ziemie" or "ℓeiernice") at the same level with "typical" chernozems. Classification of these soils in WRB depends on the presence of chernic horizon, depth of secondary carbonate accumulation and depth of gleyic/stagnic properties, and may vary from Gleyic/Stagnic Chernozems/Phaeozems to Mollic Gleysols/Stagnosols. Although WRB classification differs from national classifications in the concepts and priorities of classification, it provides large opportunity to reflect the spatial variability and various stages of transformation/degradation of chernozemic soils in Central Europe.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Calcisols
Chernozems
Gleysols
Kastanozems
Phaeozems
soil classification
Megjelenés:Soil Science Annual. - 70 : 3 (2019), p. 244-257. -
További szerzők:Charzynski, Przemyslaw Czigány Szabolcs Novák Tibor (1973-) (geográfus) Saksa, Martin Switoniak, Marcin
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

3.

001-es BibID:BIBFORM104201
035-os BibID:(WOS)000583159400002 (Scopus)85102121129
Első szerző:Novák Tibor (geográfus)
Cím:Development of soil organic carbon pools after vineyard abandonment / Tibor József Novák, József Incze, Almuth McLeod, Luise Giani
Dátum:2020
ISSN:2300-4975
Megjegyzések:Abandoned vineyard soils show quick recharge of soil organic carbon (SOC) stocks after cancellation of cultivation. In the study abandoned vineyards with six different age classes concerning the duration of postagricultural development, organized along two lines in different exposures on slope (one S and one SW exposed chronosequence) were selected. Involving an additional recently cultivated vineyard location, totally 13 sites were sampled for topsoil characteristics. In each bulk soil sample density fractions, hot water extraction, and microbial samples were separated. Accordingly the C and N content and C/N ratio of free particulate organic matter (FPOM), occluded particulate organic matter (OPOM), clay-, silt- and sand sized microaggregates, hot water soluble organic matter, and microbial biomass were measured and discussed in the study. We found that labile, active carbon pool (FPOM) have relatively low share of the TOC (in average 11.6% in S and 4.6% in SW sequence) and showed no increase with the time since the cancellation of cultivation. Also this pool has generally higher C/N ratio (20.6 +/- 3.7), as more stable pools (OPOM: 19.2 +/- 9.6; clay fraction: 9.2 +/- 1.2,). Highest part of TOC is stored in clay-sized microaggregates (in average 37.2% in S and 41.5% SW sequence) and its amount correlates significantly with the time since the cancellation of cultivation. By comparison, in recently cultivated soil lower share of C in clay sized microaggregates and (24.0% of TOC) and higher share of labile, FPOM (26.6% of TOC) was found. C-pools in microbial and hot water extractable C forms showed signifi cant changes with the time. Based on exposure and cultivation also proved different, anyway, their contribution to TOC are low.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Postagricultural soils
Chronosequence
Organic carbon fractions
Free particulate organic matter
Occluded particulate organic matter
Megjelenés:Soil Science Annual. - 71 : 3 (2020), p. 236-245. -
További szerzők:Incze József (1988-) (geográfus) McLeod, Almuth Giani, Luise
Pályázati támogatás:NKFIH-1150-6/2019
Egyéb
BO/00448/17/10
MTA
ÚNKP-19-4-DE-129
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

4.

001-es BibID:BIBFORM063063
Első szerző:Sándor Gábor (geográfus)
Cím:Influence of human activities on the soils of Debrecen, Hungary / Gábor Sándor, György Szabó
Dátum:2014
ISSN:2300-4975
Megjegyzések:Soil profiles of the city centre of Debrecen were investigated in order to examine their properties and investigate the vertical distribution of heavy metals as a measure the anthropogenic activity. During the laboratory work the basic soil features wereidentified (texture, artefact content, pH, CaCO3, and amounts of organic matter). Furthermore, contents of Pb, Zn, Cu and Co in the soils were measured. Most of the metals showed a strong positive correlation with the humus content and the silt fraction. The soils of the city centre are exposed to a significant anthropogenic effect, therefore the original soil morphologies are usually difficult to identify. The soil profiles are greatly disturbed, which is traceable in the vertical distribution of certain soil features and metal contents.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
urban soils
Debrecen
anthropogenic effect
artefact content
metal content
Doktori iskola
Megjelenés:Soil Science Annual. - 65 : 1 (2014), p. 2-9. -
További szerzők:Szabó György (1964-) (geográfus, egyetemi tanár)
Pályázati támogatás:TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
Földtudományok Doktori Iskola
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1