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UDK 631.47 ©
C. V. Secu, C. Patriche, I. Vasiliniuc

ASPECTS REGARDING THE CORRELATION OF THE ROMANIAN SOIL
TAXONOMY SYSTEM (2003) WITH WRB (2006)

University Al I Cuza, Romania
The Romanian system of soil taxonomy evolved in time, borrowing a series of elements from
international soil classification systems (FAO, WRB) or from those with applicability to large areas
(Soil Taxonomy), without losing its own characteristics, facts that allow a better correlation with
WRB (2006). The correlation between the two taxonomy systems is needed in bringing up-to-date the
soil terminology.
Keywords: Romanian Soil Taxonomy System (2003), WRB-SR (2006), correlation.

C. В. Секу, C. Патриче, І. Василинюк
Університет Яс, Румунія
АСПЕКТИ КОРЕЛЯЦІЇ РУМУНСЬКОЇ СИСТЕМИ ТАКСОНОМІЇ ҐРУНТІВ (2003)
З WRB (2006)
Румунська система таксономії ґрунтів розвивається в часі, запозичаючи ряд елементів з
міжнародних систем класифікації ґрунтів (ФАО, WRB) або з тих, які застосовуються в бага-
тьох регіонах (таксономія ґрунтів), не втрачаючи своїх особливостей, які дозволяють кращу
кореляцію з WRB (2006). Кореляція між двома системами таксономії необхідна в забезпеченні
сучасної термінології ґрунтів.
Ключові слова: румунська система таксономії ґрунтів (2003), WRB (2006), кореляція.

The first proposal for organizing the Romanian soils belongs to Gh. Munteanu–Murgoci
(1911) (IUSS Working Group WRB, 2006); the first official classification has been elabo-
rated by the National Institute for Soil and Agrochemical Research (ICPA) Bucharest (1973)
(Conea, Rapaport, Popovaţ, Asvadusrov, Teaci, 1976), followed by intermediary versions
(1980) (Conea, Florea, Puiu coord., 1980). (2000) (Florea, Munteanu coord., 2000). Presently
the Romanian Soil Taxonomy System (SRTS) 2003 is in use (Florea, Munteanu coord.,
2003). At the initiative of the International Society of Soil Science, in 1961 a project for the
creation of a world soil map scaled 1:5.000.000 begun, map presented with the occasion of
the 9th ISSS Congress (1969). This project continued, being taken the decision to elaborate a
world base for the classification of soil resources, being continuously improved (1998 and
2006) (FAO-ISRIC-ISSS, 1998; IUSS Working Group WRB, 2006).
SRTS evolved at the beginning under the influence of the Russian classification sys-
tems, and later the more recent editions borrowed elements from FAO, Soil Taxonomy
(USDA, 1998) and WRB systems. Presently the Romanian Soil Taxonomy System inte-
grates both the classic terminology and the recent elements that allow a better soil charac-
terization and classification.
OBJECT AND METHODS
Departing from the recent editions of the two soil classification systems, we consid-
ered necessary the re-correlation of some taxa (references=types) or of some secondary
elements (qualifiers), that would lead to an improvement in the correlation of SRTS with
the WRB and the amendment of the nomenclature used in the Romanian system.
SRTS 2003 is a multi-category hierarchic system, with a two level structure (lower and
upper), different from that elaborated by WRB-SR (2006). In SRTS, at the superior (upper)
level are individualized the soil class, types and subtypes, and at the lower (inferior) the soil
variety, species, family and variant, while in WRB to the first level belong the references, and
to the second the qualifiers – combinations added to the references. In this situation the refer-
ences may be assimilated to the soil types and the qualifiers to the subtypes.

© Secu C. V., Patriche C., Vasiliniuc I., 2008
56 Ґрунтознавство. 2008. Т. 9, № 3–4

Because WRB is a taxonomic system of global coverage, it will have higher horizon
diversity in what regards soil formation. Thus in WRB there are more horizons (33) than in
SRTS (31), the second system being characterized by a higher diversity of the bio-
accumulative horizons (table 1).
Table 1
Comparative table of the SRTS (2003) and WRB (2006) structures
SRTS (2003) WRB (2006)
Structure
Classes 12, no equivalent
Types 32 32 references
subtypes 64 (+28 subdivisions of subtypes) 179 qualifiers
Horizons (total number)
33 31
Equivalent horizons
17
Properties (number)
21 14
Equivalent properties
10
Diagnostic (parental) materials
6 materials (to which are added 5 subdivi-
12 materials
sions for anthropic materials)

The correlations between SRTS (2003) and WRB-SR (2006) have an approximate char-
acter, fact that recommends in the translation of the designations, if possible, references to the
soil morphological description and chemical analyses. The 2003 edition of the SRTS includes
correlation tables with the WRB (1998), and here is where we need a series of modifications
imposed by the last edition of the WRB, some of which are detailed in what follows.
The reference soil group of the Stagnosols recently included in the 2006 WRB has
been correlated in the previous edition (1998) with the SRTS reference groups of the Cam-
bisols and Luvisols, preceded by the stagnic qualifier. Now we might say that there is a
better correlation among the two taxonomic entities (Secu, Patriche).
Differently from the previous edition where was included the Antrosols reference
group, WRB-SR 2006 maintains the old designation only for soils modified through agri-
cultural activities, and introduces the Technosols reference group, soils whose formation is
determined by human influence, mainly through industrial activities, but also by certain
parental materials associated to the mentioned activities. In SRTS the anthropically-modified
soils are assigned to two classes – the Entiantrosol to the Protisols class, and the Erodosol and
Antrosol to the Antrosols class; the taxonomic concept is in the first case the profile morphol-
ogy through thickness and in the second the soil forming factor – human activities.
At the lower level, the correlation of the qualifiers with the subtypes, of the diagnostic
properties and of the parental materials between the two taxonomic systems implies numer-
ous problems, that will be approached according to their importance in soil designation.
The approach of the correlation problems was realized on the basis of the existent lit-
erature, analyses of soil profiles and discussions with soil scientists at national conferences.
RESULTS AND THEIR DISCUSSION
The introduction of the Stagnosols reference group in WRB-SR assures the corre-
spondence with the SRTS Stagnosol type and a correlation at the subtype – qualifier level,
with the exception of the planic Stagnosol (table 2).
In WRB-SR the planic qualifier does not exist, so it may be partly assimilated to the
abruptic qualifier, with the mention that the later does not enter the qualifiers associated to
the Stagnosols reference group. From another viewpoint, the planic character refers strictly
to the sudden textural transition between the E (eluvial) and Bt (argic) horizons, while the
Ґрунтознавство. 2008. Т. 9, № 3–4 57

abruptic character mentions the sudden textural change in the first 100 cm of the soil pro-
file, thus being applicable to a larger number of soil reference groups (Solonetz, Plintosols,
Phaeozems and others).
Table 2
Correlation of Stagnosols (SRTS 2003 – WRB 2006)
SRTS (2003) WRB-SR (2006)
Stagnosol luvic (STlv) Luvic Stagnosol (lvST)
Stagnosol albic (STal) Stagnosol (Albic) (STab)
Stagnosol vertic (STvs) Vertic Stagnosol (vtST)
Stagnosol gleic (STgc) Stagnosol (Gleic) (STgl)
Stagnosol planic (STpl) ?
Stagnosol histic (STtb) Histic Stagnosol (hiST)

The correlation of the soils formed under the influence of the anthropic activities or of
the materials resulted from these raises numerous problems of correlating the subtypes with
qualifiers. In SRTS the soil types formed under the influence of the anthropic factor are
separated into two classes (the Entiantrosol belongs to the Protisols class; the Erodosol and
Antrosol to the Antrosols class). The separation criteria have had in view the weak profile
development and the presence of the anthropic parent materials (in the case of the Entian-
trosols), the diminishment of the profile’s thickness through human intervention (Ero-
dosols) or the modification of the upper horizons through deep tillage or through input of
materials (Antrosols).
Having in view the fact that WRB covers a much larger area that our national taxon-
omy system, we may appreciate that there is a good correlation of the soils formed under
anthropic influence. Still, in some cases this correlation is impossible, and from this motive
he preferred to use the question sign ? for the lack of a correspondence or the bracketed
sign (?) when we consider the correlation is not so good (table 3 and 4).
Table 3
Correlation of Antrosols (SRTS 2003, WRB-SR 2006)
SRTS (2003) WRB-SR (2006)
Antrosol hortic (ATho) Hortic Anthrosol
Antrosol antracvic ?
Antrosol psamic Anthrosol arenic
Antrosol pelic Anthrosol clayic
Antrosol calcaric Anthrosol ?
Antrosol eutric Anthrosol eutric
Antrosol distric Anthrosol distric

The proposed correlation Entiantrosol rudic (SRTS) – Skeletic Regosol (WRB) is not
quite congruent, because the Entiantrosol implies anthropic parent materials while the Re-
gosol comes from the transformation of mineral materials. The skeletic anthropic parent mate-
rial that defines the rudic character faces some deficiencies, because the skeleton only refers
to rocks. Thus it would be more proper to use the pseudo-skeletic denomination, that would
indicate the presence of un-compacted, anthropically transported (natural) rocks. This separa-
tion would also need a specification of the percentage of the skeleton from the soil (horizon)
volume. In this way, the possible new qualifier pseudo-skeletic would be different from the
litoplacic one, because the rocks included in the soil material wouldn’t be compacted.
Respecting the soil thickness morphological criterion, the Entiantrosol is more closely
related to the Regosol, situation presented by SRTS, but differs through its pedogenesis;
while the rudic character is defined in terms related rather to the technic qualifier.
The mixic qualifier doesn’t have an equivalent in WRB-SR (2006), but still resembles
the terric horizon, respectively the homonymous qualifier, that has a totally different sig-
nificance and applicability in comparison to the teric qualifier from the SRTS. On the basis
of the mentioned features we have correlated the type Entiantrosol mixic with the Terric
Antrosol (mixic≈teric (WRB)≠teric (SRTS)).


Table 4
Correlation on Entiantrosols (SRTS, 2003) with Technosols (WRB-SR, 2006)
SRTS (2003) WRB-SR (2006)
Entiantrosol urbic (Etur) Urbic Tehnosol (ub
Entiantrosol rudic (Etru) ? Tehnic Regosol
Entiantrosol garbic (Etga) Garbic Tehnosol
Entiantrosol spolic (Etsl) Spolic Tehnosol
Entiantrosol mixic (Etmi) ? Terric Antrosol
Entiantrosol reductic (ETre) Tehnosol reductic
Entiantrosol psamic (ETps) Tehnosol arenic
Entiantrosol pelic (Etpe) Tehnosol clayic
Entiantrosol copertic (ETco) (?) mollic (umbric) Tehnosol
Entiantrosol litic (ETli) Leptic Tehnosol
Entiantrosol litoplacic (ETlp) Ecranic Tehnosol

The type Entiantrosol copertic may have two equivalents at the qualifier level (molic
and umbric). The umbric horizon is associated for the Romanian territory with the high
mountainous area, usually with reduced anthropic activities, yet we cannot exclude the pos-
sibility of its combination with the Technosol (Entiantrosol), on very small surfaces.
For a better use of the SRTS we appreciate that it would be advisable that the future
edition of the taxonomy system to include a sole class for the anthropically modified soils
(e.g. Anthrosols).
In this sole, we consider appropriate to use in the separation of the subtypes the crite-
rion of the strength of the soil forming factor. In a first stage would be identified the activ-
ity (activities) that generate a soil type or more through correspondence to the main soil
forming process that imprints specific features to the soils from a class (e.g. the eluviation-
iluviation leads to the formation of the soils belonging to Luvisols, and so on). To some
anthropic activities are associated diagnostic horizons (e.g. the hortic and antracvic hori-
zons), and to others anthropic materials (e.g. garbic, urbic).
In this way the soils resulted from agricultural activities might be designated as An-
troagrosols, while those formed in industrial areas would be Antrotehnosols.
In a second stage, will be applied the morphologic criterion, as an expression of the
pedogenetic process, that will allow the individualization of the soil subtypes on the basis
of some properties of the horizons or of the materials, that at the taxonomic level is trans-
lated through the sequence of qualifiers.
Another aspect that should be taken into account in the nomenclature ascribing is its
relevance in relation to the soil forming process, the parent material that significantly con-
tributes to the formation of the taxonomic unit and the class it is part of.
In SRTS 2003 there are soil types whose names have a common origin with the class,
through the soil forming process (e.g. the Luvisols class with the Preluvosol, Luvosol,
Planosol and Alosol soil types), classes in which the designations are totally different, gen-
erated mainly by the different soil forming factors (e.g. the Protisols class), and classes that
have different names, although the pedogenesis mainly takes place under the influence of
the same factor (human), even if through different activities. In what regards the name of
the soils resulted from erosion (Erodosols), it may be corrected, due to the fact that erosion
is not always human-induced, being also a natural, geologic process, manifested in time as
a consequence of the rainfall aggressiveness. We consider that for the soil resulted from
accelerated erosion induced by human activities, the designation of Antroerodosol would be
more proper, being at the same time closer to the name of the soil class.
Another problem occurred in the correlation of the WRB Luvisols with the Prelu-
vosols, the later being in an intermediary evolution stage, reflected by the lack of the eluvial
horizon. These soils do not have a correspondent at the level of the units from the reference
group of the Luvisols (WRB-SR, 2006). As a consequence we appealed again to a qualifier
undefined in WRB-SR, respectively protoalbic, that denotes an incipient stage in the for-
mation of the albic horizon, that includes all the eluvial horizons defined in SRTS 2003
(luvic, albic). The correlation Protoalbic Luvisols (WRB-SR, 2006) with the Preluvosols

(SRTS, 2003) is somehow forced, because not always the pedogenetic evolution is progres-
sive, evolving in the direction of an eluvial (E) horizon formation.
The Criptopodzols raise in their turn a series of problems. They have been «pro-
moted» in SRTS (2003) at the genetic soil type, belonging to the Spodisols class. The au-
thors of the SRTS (2003) correlate both Criptopodzols and Prepodzols with the 1998 WRB-
SR Entic Podzols, characterized by the lack of the eluvial horizon and the presence of a
diffuse spodic B one. Yet the Criptopodzols are firstly characterized by the high quantity of
organic matter from the level of the spodic horizon (>10 %), which masks the reddish color
specific to the spodic horizon. This basic element is not found at the level of the Entic Pod-
zols. Thus we consider as more adequate the correlation of the Criptopodzols with units of
the organic matter rich Podzols, respectively Umbric Podzols (WRB-SR, 2006), or if we
wish to specify the lack of the albic horizon we may accept the formula of Umbri-entic
Podzol, which is closer to reality.
Other correlations that deserve being discussed are presented beneath. The correlation
of the soil type Vertisol brunic (SRTS) with the chromic one of the WRB is not quite cor-
rect, because the brunic character refers to a light colored horizon, and the chromic one to a
reddish one. The correlation between Vertisol nodulocalcaric (that presents CaCO3 nodules
disseminated in the soil mass in the first 100 cm) (SRTS) and the pelic ones from the WRB-
SR doesn’t make sense, the pelic qualifier referring in the later system to Vertisols that
have a dark colored surface horizon. Erodosols (SRTS) cannot be correlated from our
viewpoint with the eroded phases of the Cambisols, Luvisols etc., because by definition the
initial soil cannot be retraced. For example the Cambic Erodosol may be derived from a
Cambisol, but also from a Cambic Chernozem. The correspondences, in our opinion, are
the eroded phases of the Regosols and Leptosols, which by definition may form and by
accelerated erosion. At the secondary level, the cambic qualifier is more exactly defined by
the WRB-SR in comparison to the SRTS, being specified and the horizon’s occurrence
depth in the first 50 cm.
Because in WRB-SR we do not have the typical qualifier that would correspond to the
typical subtype from the SRTS, we propose the elimination of the correspondent for the
typical taxonomic level, or its consideration as equivalent to the soil reference group from
the WRB-SR.
In the case of the SRTS (2003) – WRB-SR (2006) correlation, it may be remarked on
the one side the fact that the definition of the diagnostic criteria is more or less different at
the level of the two classification systems, so that they are not completely over-imposed,
even if they’re quite similar. On the other side, WRB adopted a flexible variant to use com-
binations of qualifiers in the soil designation, through suffixes and prefixes. In SRTS the
qualifiers have a fixed position in the soil label, after the symbol of the soil type. In WRB
may be used combinations of two qualifiers, suffixes and prefixes, while in SRTS is rec-
ommended the use of 2–3 qualifiers.
For example, the dystric properties from the SRTS (2003) are characterized by a base
saturation degree of less than 53 %, while in WRB-SR (2006) the same diagnostic feature is
defined by the upper limit of 50 %.
Another problem-posing qualifier from the SRTS (2003) is the pelic one, and gener-
ally the genetic type of the Pelosols. Pelic refers to soils of a very fine texture in the first 50
cm. The qualifier exists under the same name in WRB-SR (2006), yet here it refers to a
color Munsell value, moist, of 3.5 or less and a chroma, moist, of 1.5 or less in the first 30
cm of the soil profile, and is applicable only to Vertisols.
In this case, we have considered as possible the use of a qualifier not defined by the
WRB-SR (1998, 2006), respectively paravertic, resulted from the combination of the para-
prefix (meaning similar to other characteristics) with the vertic qualifier (with vertic hori-
zon in the first 100 cm). As a consequence, the hybrid paravertic qualifier refers to soils
that contain a horizon similar to the vertic one, but that do not qualify for the diagnostic
requirements specified in the definition.
Thus, the following correlations from between SRTS-WRB-SR cannot be correspon-
dent (Preluvosol pelic ≠ vertic Luvisol, Phaeozem pelic ≠ vertic Phaeozem, Chernozem
vertic ≠ vertic Chernozem, Entiantrosol pelic ≠ vertic Regosol, Aluviosol pelic ≠ vertic

Fluvisol, Regosol pelic ≠ vertic Regosol) on the basis of the mineralogical characteristics
that imprint specific morphologic features at the lower taxonomic level (subtype, respec-
tively prefix qualifiers) [For the reader to easily perceive the taxonomic levels, the refer-
ence groups are written with title case, and the prefix and suffix qualifiers with lowercase].
Regarding the correlation of the Pelosols, it is quite clear that they cannot be assimi-
lated to the Vertisols. Neither their correlation with the paravertic subunits isn’t better, and
thus the problem remains open.
The skeletic character in SRTS (2003) indicates a soil with a content of over 75 % in
coarse fragments, the sub-skeletic one having a 26–75 % content of coarse rock fragments,
while in WRB-SR (2006) the formative element at the secondary level refers to soils with
40 % skeleton.
There are some qualifiers defined in SRTS (2003) that do not have a correspondent in
WRB-SR (2006), or that have a correspondence but cannot be used but for certain soil types.
This is the case of the brunic qualifier (SRTS, 2003) that refers to Pelisols and Verto-
sols having in the upper horizon relatively light colors, with chroma over 2. The formative
element at the secondary level (brunic) refers to the cambic horizon in the WRB-SR (2006),
criteria 2 and 4. Although the two elements of the taxonomy systems have the same name,
in reality they have different significance.
The maronic qualifier, used for the separation of Kastanozems and Chernozems with an
forestalic Am horizon (variety of molic horizon formed under xerophylle forests, with quartz
accumulations as weak powdery accumulations), formed under xerophyle forests, does not
have a correspondent in WRB-SR, and we haven’t found any possibility of at least partially
correlating it with another qualifier. The authors of the SRTS correlate the soil type Kas-
tanozem maronic with the WRB calcic one, although the maronic and calcic qualifiers don’t
share anything in common. The type Chernozem maronic (SRTS) is correlated by the respec-
tive authors with the calci-greyic Chernozem (WRB-SR), yet the greyic qualifier is specified
to be attached only to Phaeozems. More, the forestalic Am horizon does not correspond to the
Ame (molic greyic – with residual quartz accumulations, weakly luvic horizon) one.
We also remarked the problems raised by the correlation of the Nigrosols and Hu-
mosiosols, the two types from the Umbrisols class. The main diagnostic difference between
the two soil types stands in the intimate mixture of the humificated matter with the mineral
one in the case of the Nigrosols, in comparison to its segregation from the mineral part at
the Humosiosols. In the case of Nigrosols, the higher altitude span in which they may occur
and the diversity of the landforms have consequences in the profile morphology, through
the presence of the Bv (cambic) horizon, aspect reflected at the subtype level (aluvic in the
floodplain areas or on recent terraces, litic on the abrupt slopes formed on hard rocks etc.).
Unlike Nigrosols, Humosiosols are entities linked to high mountainous areas.
Thus, we appealed to another criterion – that of the humus content, considering it to
be lower for the Nigrosols. These then may be correlated, with certain reserves, with the
humic Umbrisols of the WRB, the humic qualifier referring here to organic carbon contents,
while in SRTS it has in view the organic matter content.
For Humosiosols we will use the haplic prefix qualifier, resulting haplic Umbrisols.
This is not the only criterion that may be used. If we consider the occurrence of the Hu-
mosiosols at the highest altitudes from Romania, under the alpine grasslands from over
1800 m, with soil forming conditions determined by low temperatures and hard parental
rocks, then we may refer to these soils, according to the WRB-SR (2006) designations, as
umbric Leptosols, if the hard rock is situated at a depth of 25 cm.
The albeluvic tonguing diagnostic property from the WRB is found at the subtype
level in the SRTS, being named glosic. The meaning of the first refers to the insertions of
clay on the faces of structural aggregates. As a consequence, the glosic subtype is corre-
lated with the glossalbic qualifier, with the mention that WRB extends the penetration of
the albic horizon and in the natric one.
The continuous rock may occur in WRB as cemented pedogenetic horizon (petrocal-
cic) that has as correspondent in SRTS the association horizon petrocalxic.
The lithologic discontinuity has in WRB the level of diagnostic characteristic, differ-
ent from the SRTS where it is a secondary morphologic characteristic of the main horizons,

being annotated as numbers situated before the mark of the horizon (e.g. 2C).
The vitric properties are not present in SRTS, but may be partially assimilated to the
andic horizon or andic properties.
The diagnostic parent materials are most of them adopted from the FAO designa-
tions. In this case some names are equivalent (fluvic materials) in both systems, some aren’t
found in the Romanian taxonomy (ornithogenic material), while the organic material is
defined both as horizon (peaty) and as strata.
CONCLUSIONS
The comparative analysis of the WRB (2006) – SRTS (2003) systems shows a good
correlation at the reference – type level. Through the method of combining qualifiers, but
also through their number, the WRB system gives a better possibility of naming a soil in
comparison with SRTS.
The introduction of the two new reference groups of the Stagnosols and Technosols in
WRB 2006 allows a better correlation with the Stagnosol and Entiantrosol types from SRTS.
For certain soil types of the Romanian system that indicate stages of pedogenetic evolution
(Preluvosol) may be used a formulation such as specification plus qualifier (e.g. protoalbic)
plus reference (Luvisol). Some qualifiers have the same name, but imply different properties
(e.g. brunic); others have the same name but indicate different limits (e.g. skeletic), while a
series of qualifiers don’t have a correspondence in the WRB (e.g. maronic).
REFERENCES
Conea Ana, Rapaport C., Popovaţ A., Asvadusrov H., Teaci D., 1976, The Soil System
Classification in lower category, ICPA, p. 1-386.
Conea Ana, Florea N., Puiu Şt. coord., 1980, Romanian System of Soil Classification, ICPA,
Bucharest (in Romanian).
FAO-ISRIC-ISSS, 1998. World Reference Base for Soil Resources. World Soil Resources Re-
ports, vol. 84. FAO, Rom. 88 pp.
Florea N., Munteanu I. coord., 2000, Romanian Soil Taxonomy System. SRTS-2000, Univ.
«Al. I. Cuza» Publishing House, Iaşi, 107 p (in Romanian).
Florea N., Munteanu I. coord., 2003, Romanian Soil Taxonomy System (SRTS), ICPA, Est-
falia Publishing House, Bucharest, 182 p (in Romanian).
IUSS Working Group WRB, 2006, World reference basis for soil resources 2006, World Soil
Resources Reports, No 103, FAO, Rome, 128 p.
Murgoci G. M. 1957, Opere alese, Romanian Academy, Bucharest.
Secu C. V., Patriche C. V., Soil of the world. Classification, distribution, characteristics,
Terra Nostra Publishing House, Iaşi, 315 p (in Romanian).
USDA, 1998, Keys to Soil Taxonomy. Eighth Edition, USDA, NRCS, p. 325.

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2. secu c., patriche c., vasiliniuc i. aspects regarding the correlation of the romanian soil taxonomy system (2003) with wrb (2006)

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