Characterization of anthropogenic influence on the soil cover on selected localities of Prague.
The area of Prague has undergone a long and continuous prehistoric development, with the Neolithic sites in the north and the relatively recent Medevial colonizations in the south. Numerous archaeological finds were described in detail by Lutovsky et al. (2005).
The first infomation on soils in Prague was published by Pocta (1905). The significance of paleosols for soil evaluation of the Quaternary was established by Smolikova (1967, 1968, 1975). Engineering aspects of soils and sediments were discussed in a paper by Zaruba (1948). The state of agricultural soil resources was the subject of the study by Damaska and Nemecek (1966). Haberle et al. (2004, 2006) studied the effect of mineral nitrogen on soils in field experiments.
Disturbance of stability of soil development in urban areas of Prague by construction activities is a common phenomenon. Zigova and St'astny (2006) reported some aspects of this phenomenon. The present study is focussed on the character of soil cover in conditions of anthropogenic influence.
MATERIAL AND METHODS
The research was conducted in territories with anthropogenic impact without natural vegetation.
The climate in Prague is a function of natural conditions and the influence of urban building. The climatic gradient is almost 100 mm for the mean annual precipitation and almost 1 [degrees]C for mean annual temprature along the north-south transect. The territory of Prague belongs to the warm region T 2 in the classification of Quitt (1971). The southeastern part is a moderately warm region MT 10.
The rocks are mainly shales of Proterozoic age (Praha-Internacionalni) or Ordovician age, the latter belonging to the Arenig and Llanvirn series (Praha-MO) and Beroun series (Praha-Bohdalecka). The soils are developed on loesses of the Wurm glacial period (Chlupac, 1999; Kriz, 1999; Kovanda, 1992).
Profiles with different levels of anthropogenic influence were selected for the present paper.
The coordinates are given in the WGS 84 system.
The study area of Praha-Bohdalecka (Fig. 1) in the southeast, in the district of Vrsovice, is located 248 m above sea level, with coordinates 50[degrees]03.586' N and 14[degrees]28.172' E. The profile was sampled at a site with all horizons preserved, during a construction activity. A frost wedge reaching to a depth of approximately 3 m was observed here (Fig. 2).
The soil profile of Praha-Internacionalni (Fig. 3) in the northern part of Prague, in the district of Suchdol, is situated 290 m above sea level, with coordinates 50[degrees]06.915' N and 14[degrees]31.456'E. In this case, construction activity was started on the present surface.
The profile of Praha-MO (Fig. 4) is situated in the centre of Prague in the district of Hradcany, in the precinct of the Ministry of Defence. This area is located 255 m above sea level, with coordinates 50[degrees]05.703' N and 14[degrees]23.849' E. The profile was buried beneath a landfill layer 2.5 m thick. Material of horizon C is different. Loess is followed by a colluvium of marl and finally by loess. A propasal of improvement at this site was published by Cilek (2001).
Morphological descriptions and horizon designation follow the guidelines of FAO (2006). Colors were identified using the Munsell Soil Charts (1994). Soil horizons and types were classified according to the World Reference Base for soil resources (WRB, 2006). Some layers of the profiles are formed by redeposited soil material. This material is herein referred to as pedosediments (M). The samples were collected from individual horizons with the exception of landfill layers at Praha-MO and uppermost 14 cm of the profile at Praha-Internacionalni. Particle size distribution was determined by the pipette method, [pH.sub.H2O] was measured with an electrode SenTix21 (soil:solution ratio 1:2.5), CaC[O.sub.3] was determined by volumetric method, Cox was determined by wet combustion, total N by the Kjeldahl method, base saturation, cation exchange capacity (CEC) and exchangeable [K.sup.+], [Na.sup.+], [Mg.sup.+], [Ca.sup.+] by the Mehlich method. Hot-water extractable carbon determination followed the method of Ghani et al. (2003) with a minor modification: 50 ml distilled water were added to 2 g of soil (size < 0.25 mm) in 100 ml Erlenmeyer bottles in the first stage of preparation. The samples were placed into a drier for 24 h at the temperature of 80 [degrees]C. In the course of warming, heated samples were stirred five times and then, filtered extracts were measured. Samples of clay (size < 0.001 mm) for X-ray diffraction were separated by sedimentation from a dense suspension in distilled water and mounted on oriented slides (Jackson, 1979). The specimens were studied first air-dry, and then saturated in ethylene glykol at 80 [degrees]C for four hours in a furnance and finally heated in a muffle furnance at 550 [degrees]C for four hours. X-ray diffraction spectra were obtained on a diffractometer Philips PW 3710 under the following working condition: CuK[alpha] radiation , 40 kV, 55 mA, goniometric shift 1[degrees]. [min.sup.-1], 2[THETA]. Semiquantitive values were calculated from individual mineral basal peaks.
RESULTS AND DISCUSIONS SOIL MORPHOLOGY
A brief morphological description of the studied profiles is presented in Table 1.
The profile of Praha-Bohdalecka is specific in its variable thickness of the individual horizons. All hozions contain small rock fragments. Some pedosediments may be missing at some parts of this site. [M.sub.1] horizon is influenced by human activity. Horizons [M.sub.1], [M.sub.2], [M.sub.3], [M.sub.4], [M.sub.5] have different structures, contents of rock fragments and anthropogenic material, and the abundance of roots and worm casts. The buried profile below the pedosedimets consists of horizons [Btb.sub.1], [Btb.sub.2] and Ck only. The structure of horizons [Btb.sub.1] and [Btb.sub.2] is well developed medium subangular blocky, but the content of clay coatings is different. Soil horizons have been indicated a soil with a pedogenetic clay differentation. Pseudomycelia are a form of secondary carbonates in horizon Ck. The absence of the overlying horizons prevents to classify the soil type in detail. Pedogenic process of clay illuviation is typical for Albeluvisol and Luvisol.
The profile of Praha-Internacionalni was classified as Haplic Chernozem. The uppermost 14 cm of the profile show a higher content of anthropogenic material and a poorly developed structure. The original color of this part of the profile is dark grayish brown. Yellowish brown-colored layers 1 cm thick were decribed only locally. Structure of A horizons is well developed from medium angular blocky to fine angular blocky with the presence of worm casts. The contents of anthropogenic fragments in A horizons are variable. Bk horizons consist of pseudomycelia, and clay coatings were documented in horizon [Bk.sub.1] only. Secondary carbonates in horizon Ck have the form of pseudomycelia and hard hollow concretions.
Morphology of landfill layers in the profile of Praha-MO were examined and classified as Technosol. Individual horizons of Technosol differ in their colors. The uppermost 40 cm are dark yellowish brown, next 10 cm are yellow, being followed by dark brown 20 cm and finally by gray 180 cm. This soil has a poorly developed structure, high content of various anthropogenic material and rock fragments. Individual horizons of the buried soil have different anthropogenic material and rock fragments. Buried soils have probably a polygenetic character because clay coatings have been preserved in horizons [Ab.sub.1] and [Ab.sub.2]. Clay differentation was probably the first stage of pedogenesis. A change in the condition of soil development led to the development of Chernozem. This stage is documented by the well developed structure and the presence of worm casts. Horizons ICk and III Ck consist of pseudomycelia, hard hollow concretions and soft concretions. The structure of horizon IICk is medium prismatic.
Morphological anylysis showed that anthropogenic influence affected the frequency of anthropogenic material in the upper parts of the profiles, especially at the site of Praha-Internacionalni.
PARTICLE SIZE DISTRIBUTION
The results of the particle size distribution are shown in Table 2.
Soil horizons [M.sub.1], [M.sub.2], [M.sub.3], [M.sub.4], [M.sub.5] at Praha-Bohdalecka showed differences in particle size distribution, especially in the fractions of 0.05-0.25 mm and 0.25-2.00 mm. This type of particle size distribution indicated that M horizons were formed from different types of material. Horizons [Btb.sub.1], [Btb.sub.2] and Ck are characterized by a high content of fraction 0.01-0.05 mm. Horizons [Btb.sub.1] and [Btb.sub.2] show an elevated content of particles of <0.001 mm in size. The absence of overlying horizons prezent to determine the stage of clay illuviation. The individual horizons were defined with respect to textural classes as follows: [M.sub.1]-sandy loam, [M.sub.2]-loam, [M.sub.3]-loam, [M.sub.4]-loam, [M.sub.5]-clay loam, [Btb.sub.1]-loam, [Btb.sub.2]-loam, Ck-loam.
Fraction of 0.01-0.05 mm dominates the profile of Praha-Internacionalni. Elevated contents of fraction 0.25-2.00 mm were observed in horizon [A.sub.1]. This is covered by a layer with high content of anthropogenic material 14 cm thick. The individual horizons were defined with respect to textural classes as follows: [A.sub.1]-loam, [A.sub.2]-clay loam, [Bk.sub.1]-clay loam, [Bk.sub.2]-loam, [Bk.sub.3]-loam, Ck-clay loam.
Fraction of 0.01-0.05 mm dominates all horizons of the profile of Praha-MO except for horizon IlCk, which consists of marl colluvium. [Ab.sub.1] and [Ab.sub.2] horizons have a high content of particles <0.001 mm in size: a feature ussually characteristic for soils affected by the process of clay illuviation. The individual horizons were defined with respect to textural classes as follows: [Ab.sub.1]-clay loam, [Ab.sub.2]-clay loam, ICk-loam, IICk-clay loam, III Ck loam.
The particle size distribution of the examined profiles showed a general tendency. Prevailing particle size category of soils is 0.01-0.05 mm. In case that a part of the profile is formed under higher or direct anthropogenic influnce, the content of fraction 0.25-2.00 mm is elevated. The elevated content of particles <0.001 mm in size (Praha-Bohdalecka and Praha-MO) indicates the process of clay illuviation.
SOIL CHEMICAL PROPERETIES
The datas of soil chemical properties are summarized in Table 3.
Profile Praha-Bohdalecka is neutral in horizon [M.sub.1]. Further down, the value of pH is weakly basic as far as to horizon [Btb.sub.1], weakly acid in horizon [Btb.sub.2] and finally neutral in horizons [Btb.sub.2] and Ck. In contrast, the pH value is neutral in horizons [A.sub.1], [A.sub.2], [Bk.sub.1], [Bk.sub.2] at Praha-Internacionalni. Horizons [Bk.sub.3] and Ck show basic pH values. The profile of Praha-MO is weakly basic.
The content of CaC[O.sub.3] correspond to the type of parent material, pH and type of the pedogenic processes.
Base saturation reaches a value of 100 % in the profiles of Praha-Internacionalni and Praha-MO. This value is rather variable at Praha-Bohdalecka. Horizon [M.sub.4] has a base saturation of 70 % and horizon [M.sub.5] has a base saturation of 74 %. In other horizons, the base saturation exceeds 85 %.
CEC is relatively higher in upper parts of soil profiles and decreases with depth. Low value of CEC in horizon IICk (Praha-MO) coresponds to the character of parent material in this horizon.
The distribution of exchangeable bases in the soil profiles is similar. Ca is the main exchangeable base in all studied profiles. Elevated contents of exchangeable Na and Mg were documented in the profile of Praha-Bohdalecka (horizons [Btb.sub.1], [Btb.sub.2], Ck) and Praha-MO ([Ab.sub.1], [Ab.sub.2]). The ratio among exchangeable Ca, Mg, K and Na is favourable.
Soil chemical properties were influenced only to a small degree. Variability of chemical properties in the M horizons at Praha-Bohdalecka is rather a result of the formation of pedosediments in natural conditions. On the other hand, horizon [M.sub.1] was above direct anthropogenic influence. Probably this influence was weak, much like in the case of Praha-Internacionalni. As indicated by the obtained results, Technosol at Praha-MO was not influenced by chemical properties of the buried profile.
SOIL ORGANIC MATTER
The data of soil organic matter in the studied profiles is presented in Table 4.
Cox content and Nt are higher in the upper parts of the profiles. The highest value of organic content was documented in the pedosediments of the profile of Praha-Bohdalecka.
The content of hot-water extractable carbon (HWC) can be marked as an important indicator of the state of the soil organic matter, which can substitute so far used parametrs (for instance humic acids, fulvic acids etc.) characterizing organic matter of soil types. HWC is one of the more sensitive indicators, which can differentiate between ecosystems such as market gardening and cropping or pastoral and native bush. Given its strong positive correlation with soil microbial biomass, mineralizable N and soil aggregate stability, it appears that HWC can be used as an integrated measurement of soil quality (Ghani et al., 2003). The value of HWC in mg/kg in the profile descreases with depth, much like the value of Cox. This coresponds with data of Cheshire (1979). The high content of HWC in upper parts of the profiles may reflect low microbial activity or humus form with low stability. From this point of view, soil organic matter at Praha-Bohdalecka can be defined as less stable than that in other profiles.
The values of HWC in % Cox in the profiles show an opposite tendency than the HWC in mg/kg. This can be primarily explained by its rapid utilization as an available source of energy within biochemical transformation in soil and by its higher mobility due to the increasing contents of HWC in % Cox with depth.
The C/N ratio is higher in upper horizons in the soils. The C/N value showed that the stock of N at Praha-Bohdalecka is lesser than at Praha-Internacionalni and Praha-MO.
MINERALOGY OF THE CLAY FRACTION
Mineral composition of the studied soils is controlled by the parent material. Mineralogical character of the fraction of <0.001 mm is given in the diagrams in Fig. 5.
Quartz and illite are the dominant components at Praha-Bohdalecka. Horizons [M.sub.1], [M.sub.2], [M.sub.3], [M.sub.4], [M.sub.5] differ in the proportions of kaolinite and feldspar. Gypsum was identified in horizon [M.sub.5]. Horizon [Btb.sub.1] revealed a considerable amount of illite (ca. 29 %) and an elevated amount of kaolinite. Horizon [Btb.sub.2] revealed similar amounts of the individual identified mineral phases, only with an increase in the contents of chlorite, quartz, and a decrease in the content of kaolinite. Horizon Ck contains quartz, and a relatively high amount of kaolinite, which may be derived from the weathering crusts of the original substrate. Proportions of illite and chlorite are low in the given horizon.
The profile at Praha-Internacionalni is dominated--besides quartz--by illite. In addition, feldspar and plagioclase is present here. The proportion of chlorite is very low with the exception of horizon [Bk.sub.2], where chlorite contents are increasing. The presence of smectite was encountered in horizons [Bk.sub.2], [Bk.sub.3] and Ck. Dolomite was found in powdered samples from the whole profile. Horizon [A.sub.1], which is probably affected by anthropogenic processes, is poorer in quartz, richer in illite, and contains also amphibole. Horizon [A.sub.2] showed a high proportion of quartz and a very low content of clay minerals. It is the horizon least affected by weathering processes, as suggested by the relatively high feldspar and plagioclase content. In horizon [Bk.sub.1], on the other hand, the contents of feldspar and plagioclase are lower. Horizon [Bk.sub.2] showed high proportions of illite and kaolinite and very low amounts of quartz. Horizons [Bk.sub.3] and Ck differ to a small degree in their quartz, kaolinite and smectite contents.
Semi-quantitative mineral composition analyses at the site of Praha-MO revealed the dominance of quartz and illite. Powdered samples from horizons IICk and IIICk, with alternating pedogenic substrates, contained hematite and goethite. Amphibole is present in horizons [Ab.sub.1], [Ab.sub.2] in accessory amounts. Elevated contents of quartz and feldspar and plagioclase may be associated with the contact with anthropogenic landfills. Unlike in horizons ICk and IIICk, no feldspar and plagioclase are present in horizon IICk and the content of illite is elevated. This is in agreement with the alternation of pedogenic substrates: horizon Ck corresponds to loess, IICk corresponds to marl colluvia and IIICk corresponds to loess.
All the studied soil profiles are dominated by quartz and illite. The quartz : illite ratio varies throughout the individual profiles. At Praha Bohdalecka, variable proportions of the minerals were found in horizons [M.sub.1], [M.sub.2], [M.sub.3], [M.sub.4], [M.sub.5], which have the character of pedosediments. Their formation was probably contributed by the anthropogenic factor. Horizon [Btb.sub.1] at Praha-Bohdalecka revealed a prominent increase in the illite content and also an increase in the kaolinite content. Similar proportions of mineral phases were described by Sirovy (1973) as characteristic features of soils subjected to the clay illuviation. Elevated illite content in the top part of the Praha-Internacionalni profile is not accompanied by an elevated kaolinite content, which is a typical feature for Chernozem according to Sirovy (1966). The lower illite : kaolinite ratio at the site of Praha-MO can be explained by the probably polygenetic origin of the soil.
Soil formation is a multivarate process, where natural and anthropogenic factors and their interactions are responsible for the character of the soil profile.
The degree of anthropogenic influence on the individual soil profiles was different. Especially the upper parts of soil profiles have been affected: they show elevated proportions of fraction 0.25-2.00 mm.
The values of HWC in % Cox primarily corresponds to its rapid utilization as an available source of energy within biochemical transformation in soil and by its higher mobility due to the increasing contents of HWC in % Cox with depth.
Soil organic matter at Praha-Bohdalecka can be defined as less stable than that in other profiles.
Mineral composition of soils are dominated by quartz and illite.
The character of pedogenesis was affected by anthropogenic influence to a small degree and the differences generally result from natural conditions of soil development.
In the territory of Vrsovice, Suchdol and Hradcany, conditions of the development of soil cover were documented based on detailed soil analysis.
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The authors wish to thank Mr. Antonin Janda and the Ministry of Defence for the possibility to collect samples in their precinct. The project was supported by project A300130504 of the Grant Agency of the Academy of Sciences of the Czech Republic and the Research Plan Z30130516.
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Zigova, A. and St'astny, M.: 2006, Pedogenesis of the territory of Prague affected by human activity. In. Sarapatka, B. and Bednaf, M. (Eds.) Pedogenesis and qualitative changes of the soils in the conditions nature and anthropic impacted territories, 35-38. Sbornik referatu z 11. pedologickych dnu, Kouty nad Desnou, 20-21.9.2006.
Anna Zigova (1) *, Martin Stastny (2), Jana Krejcova (3) and Pavel Hajek (2)
(1) Institute of Geology, Academy of Sciences of the Czech Republic,v.v.i., Rozvojova 269, 165 00 Praha 6-Lysolaje, Czech Republic (2) Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, v.v.i., V Holesovickach 41, 182 09 Praha 8, Czech Republic (3) Crop Research Institute,v.v.i., Drnovska 506, 161 06 Praha 6-Ruzyne, Czech Republic
* Corresponding author's e-mail: email@example.com
(Received August 2007, accepted September 2007)
Table 1 Morphological description of soil profiles MEAB--medium angular blocky, FIAB--fine angular blocky, MESB--medium subangular blocky, FISB--fine subangular blocky, MEPR--medium prismatic, MECR--medium crumbly, COGR--coarse granular, MEGR--medium granular, PM--pseudomycelia, HHC--hard hollow concretions, SC--soft concretions, CFF--common very fine and fine, FFF--few very fine and fine Horizon, Colour Structure Rock depth (cm) (moist) fragments Praha-Bohdalecka [M.sub.1] 0-20 10YR 3/2 MEAB Very few [M.sub.2] 20-40 10YR 4/3 FIAB Very few [M.sub.3] 40-53 10YR 5/3 FISB Very few [M.sub.4] 53-83 10YR 6/4 FISB Very few [M.sub.5] 83-117 10YR 5/6 FISB Very few [Btb.sub.1] 117-144 7.5YR 6/4 MESB Very few [Btb.sub.2] 144-189 7.5YR 6/6 MESB Very few Ck 189-226 10YR 7/4 MEPR Very few Praha-Internacionalni [A.sub.1] 14-39 10YR 3/2 MECR Very few [A.sub.2] 39-73 10YR 3/3 FIAB None [Bk.sub.1] 73-83 10YR 4/4 MESB None [Bk.sub.2] 83-113 10YR 5/6 MESB None [Bk.sub.3] 113-136 10YR 7/8 MESB None Ck 136-284 10YR 6/6 MEPR None Praha-MO [Ab.sub.1] 0-45 10YR 3/1 MEGR Very few [Ab.sub.2] 45-87 10YR 3/2 COGR Very few Ck 87-165 10YR 7/4 MEPR None IlCk 165-281 10YR 6/1 MESB Common IlICk 281-321 10YR 5/8 MEPR Very few Horizon, Anthropogenic Clay coatings depth (cm) material Praha-Bohdalecka [M.sub.1] 0-20 Very few None [M.sub.2] 20-40 None None [M.sub.3] 40-53 None None [M.sub.4] 53-83 None None [M.sub.5] 83-117 None None [Btb.sub.1] 117-144 None Common [Btb.sub.2] 144-189 None Many Ck 189-226 None None Praha-Internacionalni [A.sub.1] 14-39 Few None [A.sub.2] 39-73 Very few None [Bk.sub.1] 73-83 None Few [Bk.sub.2] 83-113 None None [Bk.sub.3] 113-136 None None Ck 136-284 None None Praha-MO [Ab.sub.1] 0-45 Very few Few [Ab.sub.2] 45-87 None Few Ck 87-165 None None IlCk 165-281 None None IlICk 281-321 None None Horizon, Forms of secondary Roots Worm casts depth (cm) CaC[O.sub.3] Praha-Bohdalecka [M.sub.1] 0-20 None CFF Common [M.sub.2] 20-40 None FFF Very few [M.sub.3] 40-53 None None Very few [M.sub.4] 53-83 None None Very few [M.sub.5] 83-117 None None Very few [Btb.sub.1] 117-144 None None None [Btb.sub.2] 144-189 None None None Ck 189-226 PM None None Praha-Internacionalni [A.sub.1] 14-39 None FFF Few [A.sub.2] 39-73 None VFF Very few [Bk.sub.1] 73-83 PM None Very few [Bk.sub.2] 83-113 PM None None [Bk.sub.3] 113-136 PM, HHC None None Ck 136-284 PM, SC, HHC None None Praha-MO [Ab.sub.1] 0-45 None VFF Many [Ab.sub.2] 45-87 None VFF Common Ck 87-165 PM, SC, HHC None None IlCk 165-281 None None None IlICk 281-321 PM, SC, HHC None None Horizon, Boundary depth (cm) Praha-Bohdalecka [M.sub.1] 0-20 Clear [M.sub.2] 20-40 Clear [M.sub.3] 40-53 Clear [M.sub.4] 53-83 Clear [M.sub.5] 83-117 Abrupt [Btb.sub.1] 117-144 Clear [Btb.sub.2] 144-189 Abrupt Ck 189-226 Abrupt Praha-Internacionalni [A.sub.1] 14-39 Clear [A.sub.2] 39-73 Clear [Bk.sub.1] 73-83 Clear [Bk.sub.2] 83-113 Clear [Bk.sub.3] 113-136 Clear Ck 136-284 Clear Praha-MO [Ab.sub.1] 0-45 Clear [Ab.sub.2] 45-87 Abrupt Ck 87-165 Clear IlCk 165-281 Clear IlICk 281-321 Clear Table 2 Particle size distribution. Depth <0.001 mm <0.01 mm 0.01-0.05 mm cm % % % Praha-Bohdalecka 0-20 9.8 29.1 24.7 20-40 9.1 32.8 23.4 40-53 19.0 40.0 25.7 53-83 18.1 42.8 24.4 83-117 20.8 46.0 26.9 117-144 29.6 37.1 38.6 144-189 26.0 42.4 36.7 189-226 19.7 35.2 31.7 Praha-Internacionalni 14-39 25.0 44.1 43.7 39-73 28.6 47.3 46.2 73-83 28.8 49.8 45.2 83-113 20.1 40.9 45.6 113-136 22.2 37.0 49.2 136-284 23.7 47.4 36.5 Praha-MO 0-45 30.8 52.4 34.0 45-87 32.2 48.9 40.3 87-165 18.9 42.7 43.1 165-281 31.1 47.8 17.5 281-321 24.9 43.8 31.0 Depth 0.05-0.25 mm 0.25-2.00 mm cm % % Praha-Bohdalecka 0-20 14.7 31.5 20-40 18.2 25.6 40-53 13.2 21.0 53-83 15.9 16.8 83-117 13.0 14.0 117-144 14.9 9.5 144-189 15.0 5.9 189-226 19.4 13.7 Praha-Internacionalni 14-39 5.0 7.2 39-73 4.6 1.9 73-83 3.9 1.1 83-113 11.8 1.7 113-136 13.0 1.0 136-284 12.6 3.4 Praha-MO 0-45 8.9 4.6 45-87 7.4 3.4 87-165 11.0 3.2 165-281 32.0 2.7 281-321 13.6 11.5 Table 3 Chemical properties of soil profiles. CEC--cation exchange capacity , BS--base saturation, [K.sup.+]--exchangeable K, [Na.sup.+]--exchangeable Na, [Ca.sup.2+]--exchangeable Ca, [Mg.sup.2+]--exchangeable Mg. Depth [pH.sub. CaC[O. BS CEC [K.sup.+] cm H2O] sub.3] % mmol/ mmol/ % 100 g 100 g Praha-Bohdalecka 0-20 7.03 1.4 89.0 26.6 0.66 20-40 7.18 1.0 100.0 23.5 0.44 40-53 7.18 <0.1 92.0 18.6 0.40 53-83 7.18 <0.1 70.0 16.8 0.42 83-117 7.17 <0.1 74.0 17.3 0.22 117-144 7.10 <0.1 85.0 23.9 0.28 144-189 6.88 <0.1 90.0 21.0 0.24 189-226 7.57 1.8 100.0 16.8 0.17 Praha-Internacionalni 14-39 7.43 0.7 100.0 21.5 0.51 39-73 7.79 <0.1 100.0 20.9 0.31 73-83 7.84 1.2 100.0 20.7 0.35 83-113 8.10 16.0 100.0 16.2 0.27 113-136 8.25 14.0 100.0 14.7 0.27 136-284 8.25 9.5 100.0 18.9 0.27 Praha-MO 0-45 7.38 <0.1 100.0 24.3 0.35 45-87 7.48 <0.1 100.0 21.0 0.27 87-165 7.91 13.0 100.0 15.3 0.22 165-281 7.88 0.2 100.0 9.7 0.27 281-321 7.88 1.2 100.0 15.7 0.26 Depth [Na.sup.+] [Ca.sup.2+] [Mg.sup.2+] cm mmol/100 g mmol/100 g mmol/100 g Praha-Bohdalecka 0-20 0.14 24.00 1.92 20-40 0.20 21.32 2.03 40-53 0.23 14.75 2.05 53-83 0.20 12.36 2.10 83-117 0.26 12.42 2.40 117-144 0.42 19.54 3.40 144-189 0.75 16.74 3.73 189-226 0.74 17.67 2.58 Praha-Internacionalni 14-39 0.03 20.17 1.56 39-73 0.07 17.98 1.61 73-83 0.13 20.39 1.58 83-113 0.11 19.09 1.36 113-136 0.11 19.55 1.48 136-284 0.14 23.20 2.51 Praha-MO 0-45 0.36 20.16 3.12 45-87 0.61 18.33 2.61 87-165 0.53 19.45 2.01 165-281 0.14 9.43 1.65 281-321 0.20 15.36 2.53 Table 4 Soil organic matter. HWC--hot-water extractable carbon. Depth Cox HWC HWC Nt C/N cm % v % Cox mg/kg % Praha-Bohdalecka 0-20 3.20 2.22 833 0.229 13.97 20-40 2.20 2.43 701 0.205 10.73 40-53 1.48 2.74 455 0.134 11.04 53-83 0.92 4.34 568 0.116 7.93 83-117 0.80 4.34 473 0.100 8.00 117-144 0.68 3.29 322 0.076 8.94 144-189 0.24 4.25 170 0.050 4.80 189-226 0.16 7.27 189 0.050 3.20 Praha-Internacionalni 14-39 1.48 0.79 372 0.143 10.35 39-73 0.84 2.44 222 0.108 7.78 73-83 0.36 1.92 94 0.070 5.14 83-113 0.20 6.00 150 0.050 4.00 113-136 0.12 8.19 131 0.050 2.40 136-284 0.20 0.59 113 0.056 3.57 Praha-MO 0-45 1.12 0.46 56 0.146 7.67 45-87 0.44 4.46 223 0.071 6.20 87-165 0.12 7.28 131 0.050 2.40 165-281 0.12 7.75 93 0.111 1.08 281-321 0.12 8.45 169 0.052 2.30
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|Author:||Zigova, Anna; Stastny, Martin; Krejcova, Jana; Hajek, Pavel|
|Publication:||Acta Geodynamica et Geromaterialia|
|Date:||Jul 1, 2007|
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