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Figure 1

Location of the study sites, Biebrza valley
Location of the study sites, Biebrza valley

Figure 2

Relationships between values of soil organic carbon, soil organic matter, total nitrogen, dissolved organic carbon and dissolved organic nitrogen (SOC, SOM, Ntot, DOC and DON) using linear regression
Relationships between values of soil organic carbon, soil organic matter, total nitrogen, dissolved organic carbon and dissolved organic nitrogen (SOC, SOM, Ntot, DOC and DON) using linear regression

Figure 3

Relationship between relative value of soil organic carbon and soil organic matter based on linear regression
Relationship between relative value of soil organic carbon and soil organic matter based on linear regression

Figure 4

Relationship based on non-linear regression between relative value of A) soil organic carbon and total nitrogen, B) soil organic carbon and dissolved organic nitrogen and, C) soil organic carbon and dissolved organic carbon
Relationship based on non-linear regression between relative value of A) soil organic carbon and total nitrogen, B) soil organic carbon and dissolved organic nitrogen and, C) soil organic carbon and dissolved organic carbon

Range of values for the soil parameters examined

Soil propertyUnitsmin (relative 0%)max (relative 100%)
SOC%0.1656.1
Ntot%0.013.22
SOM%0.495.66
DOCmg kg−116.565287
DONmg kg−11.19245.6

Changes in soil properties depending on relative values of SOC content within the range from 20% to 30%

SOC (%)3029282726252423222120
N tot (%)33.7332.3731.0229.6628.3126.9725.6424.3123.0021.7020.42
ΔNtot (%)1.361.361.351.351.341.331.321.311.301.29
SOM (%)30.8429.8128.7827.7626.7325.7024.6723.6422.6221.5920.56
ΔSOM (%)1.031.031.031.031.031.031.031.031.031.03
DON (%)26.3325.4724.6023.7322.8521.9721.0920.2019.3118.4117.52
ΔDON (%)0.860.870.870.880.880.880.890.890.890.89
DOC (%)17.5817.4217.2317.0316.8116.5716.3016.0115.7015.3614.99
ΔDOC (%) Table40.170.180.200.220.240.260.290.310.340.37

Pearson’s correlation coefficients for SOC, Ntot, SOM and DOC in the studied peat soils (all correlations were significant at p < 0.05)

ParametersSOCNtotSOMDOC
Ntot0.85
SOM0.980.90
DOC0.610.340.57
DON0.720.700.720.72

Changes in soil properties depending on relative values of SOC content within the range from 0% to 50%

SOC (%)50403020100
Ntot59.0647.1233.7320.428.670.00
ΔNtot11.9413.3813.3211.758.67
SOM51.4041.1230.8420.5610.280.00
ΔSOM10.2810.2810.2810.2810.28
DON41.6534.5326.3317.528.580.00
ΔDON7.128.208.818.948.58
DOC19.2418.5817.5814.999.550.00
ΔDOC0.661.002.595.449.55

Mean values and standard deviations for the examined variables in four groups of soil data (n = 100). The same letters mean that differences between groups are not significant

Group of soils with the SOC content (%) in the rangeSOCNtotSOMDOCDONC/NDOC/SOCDON/Ntot
%mg kg-1Min–max% (min–max)%
36–5644.65d ±5.982.2d ±0.6178.68d ±9.281741.1c ± 1469.6115.23b ± 56.3218–240.39 (0.07–0.63)0.52
16.1–35.928.61c ±6.051.73c ±0.6350.54c ±16.31266.1bc ±831.7109.05b ±63.3215–210.44 (0.19–0.60)0.63
3.1–167.96b ±3.070.55b ±0.2414.32b ±5.79497.8ab ±383.431.04a ±16.2614–160.62 (0.20–0.80)0.56
0.1–31.24a ±0.940.05a ±0.042.91a ±3.27146.1a ±137.54.06a ± 2.5124–301.17 (0.29–1.28)0.81
eISSN:
2353-8589
Language:
English
Publication timeframe:
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Journal Subjects:
Life Sciences, Ecology