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ŠUMARSKI LIST 1-2/2011 str. 27     <-- 27 -->        PDF

M. Kobal, M. Urbančič, N. Potočić, B. De Vos, P. Simončič: PEDOTRANSFER FUNCTIONS FOR BULK DENSITY... Šumarski list br. 1–2, CXXXV (2011), 19-27


Table 3 Morphological, physical and chemical properties of four soil profiles for evaluating C estimations.


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Tablica 3.Morfološka, fizikalna i kemijska svojstva četiri profila tla za ocjenu kvalitete predviđanja zalihe ugljika


Profile
Profil
Horizon
Horizont
Horizon boundary
Granica horizonta
Upper Lower
Gornja Donja
Physical soil properties
Fizikalna svojstva tla
Clay Silt Sand Stoniness
Glina Prah Pijesak Kamenitost .b
Chemical soil properties
Kemijska svojstva tla
OC N pH CEC BSKIK
-Cm Cm % % % % g/cm
3
% % -cmol/kg %
Zajama AC
CA
0 13
13 33
9.9 48.2 42.0 15
20.2 57.0 22.8 40
0.520
0.737
9.47 0.78 6.99 83.89 100
6.52 0.56 7.24 68.28 100
Lubnik AC
BC
0 15
15 45
32.5 51.9 15.6 15
40.7 43.1 16.1 40
0.719
0.801
10.70 0.73 7.13 66.72 100
8.47 0.68 7.18 58.05 100
Besnica A
Bv
BC
CB
0 3
3 29
29 49
49 82
20.4 27.7 51.9 5
12.2 40.3 47.5 8
18.1 36.1 45.8 30
18.9 34.0 47.2 65
0.842
1.468
1.529
1.474
8.38 0.5 3.47 12.62 45.7
1.06 0.06 3.89 5.39 15.7
0.45 0.03 4.01 4.16 10.8
0.49 0.03 4.00 4.43 12.5
Merljaki A
E
BE
BC
0 10
10 47
47 85
85 122
25.4 40.8 33.8 5
21.5 50.6 27.9 10
26.5 43.2 30.3 13
32.9 46.5 20.6 13
0.928
1.239
1.339
1.206
6.86 0.46 3.69 10.95 40.3
0.67 0.06 3.81 7.18 6.6
0.63 0.05 3.84 5.95 5.6
0.69 0.05 3.95 5.65 12.3


Table 4 Estimated carbon stock (C ) tilldepth of parent material for four different soil profiles based on measuredand


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calculated bulk densities.


Tablica 4.Zaliha ugljika do dubine matičnog supstrata za četiri profila tla, procijenjena na osnovi izmjerenih i izračunatih
gustoća tla.


Profile
Profil
Measured
bulk density
Izmjerena
gustoća tla
Carbon stock C
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in t/ha
Zaliha ugljika Cpool u t/ha
Bulk density calculated using PTF
Gustoća tla izračunata pomoću PTF
SFI 6 Jeffrey Harrison Tamminen Kaur
Zajama
Lubnik
Besnica
Merljaki
112.1
220.2
75.3
135.9
138.0
200.7
68.6
137.7
115.0
169.3
62.4
126.0
139.3
206.2
73.7
148.9
166.3
247.6
72.0
145.6
52.7
59.8
52.1
101.4


model is nicely predicting the.bof the profile ‘’Merljaki’’,
whereas differences for other soil types are larger;
i.e. even higher than 25t of OC per hectare (profile
‘’Zajama’’).Using non local PTFs drawn from litera


ture may resulted in high differences between measured
and calculated C up to 160 t of OC per hectare


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(profile ‘’Lubnik’’, PTF Kaur).


4. CONCLUSIONS – Zaključci


Using national data from a 16 × 16 km plot network,
we developed a pedotransfer functionfor bulk density
of mineral forest soils of Slovenia. Most of the variability
in soil bulk density can be explained by concentration
of organic carbon. Adding other chemical (pH, N,
CEC, BS) and physical soil properties (soil texture) in
the regression equation did not significantly improve
the prediction quality.The prediction quality of all five
PTFs (Jeffrey, Harrison, Tamminen, Kaur and local SFI
6) were tested using four validation indices (MPE,
SDPE, RMSPE,R2 ), the result being that local PTF SFI


6 gives the most accurate prediction of soil bulk density.


The PTFs were also used for prediction of carbon


stocks in forest soils. Unexpectedly, using the local


PTF SFI 6 could still lead to possible inaccuracies of
the C calculation higher than 25t of OCper hectare.


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Weassume that the main reason for that is a high pedodiversity
of Slovenian forest soils, requiring additional
soil .b sampling, especially for the main forest soil
types.