Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia
Soil organic carbon (SOC) is a critical measure of soil organic matter (SOM) content. SOM plays a vital role in ecosystem services, soil fertility, soil water retention capacity, and carbon cycling. SOC can be partitioned into various carbon fractions, which exhibit diverse stability and chemical co...
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| Format: | Article |
| Language: | English |
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Slovenian Academy of Sciences and Arts
2019-12-01
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| Series: | Acta Carsologica |
| Online Access: | https://ojs.zrc-sazu.si/carsologica/article/view/7305 |
| _version_ | 1811170075416199168 |
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| author | Hui Yang Mitja Prelovsek Fen Huang Chunlai Zhang Jianhua Cao Nataša Ravbar |
| author_facet | Hui Yang Mitja Prelovsek Fen Huang Chunlai Zhang Jianhua Cao Nataša Ravbar |
| author_sort | Hui Yang |
| collection | DOAJ |
| description | Soil organic carbon (SOC) is a critical measure of soil organic matter (SOM) content. SOM plays a vital role in ecosystem services, soil fertility, soil water retention capacity, and carbon cycling. SOC can be partitioned into various carbon fractions, which exhibit diverse stability and chemical compositions that are influenced variably by lithology as well as biological and climatic processes. A better understanding of SOC and the influence of different bedrock types on carbon fractions could facilitate the evaluation of the fate and stability of SOC. The present study is focused on the concentrations and characteristics of different SOC fractions (e.g., Labile organic carbon, LOC; Recalcitrant organic carbon, ROC; Calcium-bound organic carbon, Ca-SOC; Iron/aluminium-bound organic carbon, Fe/Al-SOC) in forest soils associated with different bedrock lithology under similar climate conditions in the centre of the ‘Classical Karst’, and evaluates influence of the geological environment on SOC. SOC and SOC fraction concentrations decreased with an increase in depth in all profiles, indicating stabilized soil profiles. SOC values (9.7–45.5 g∙kg-1) were consistent with the findings of other studies on soils in the region. ROC and Fe/Al-SOC (51.5–65.8 % and 68.0–73.3 %, respectively) were the major SOC fractions, while Ca-SOC accounted for a considerably lower proportion (6.4–7.4 %) of the SOC contents. Key factors influencing SOC contents were calcite (expressed as calcium oxide) and clay contents, which represent mineral complexes stabilizing SOC. Overall Fe2O3 and Al2O3 concentration did not explain differences in SOC nor its fractions, potentially due to the importance of chemical/mineral forms of Fe- and Al-related minerals (reactivity). Soils on carbonate rocks, which are richer in clay and CaO, had 6.35 g∙kg-1 (28 percentage points) higher concentrations of SOC average when compared with soils on siliciclastic rock, due to higher concentrations of stabilized SOC fractions. The results demonstrate that bedrock lithology and pedogenesis are key factors influencing SOM stabilization.
Key words: karst soil, soil organic carbon, labile organic carbon, recalcitrant organic carbon, calcium-bound organic carbon, iron/aluminium-bound organic carbon.
Kvantifikacija in vrednotenje organskega ogljika in njegovih frakcij v tleh: primer s Klasičnega Krasa, JZ Slovenija
Z meritvami organskega ogljika v prsteh (SOC) izražamo vsebnost organskih snovi v prsteh (SOM). SOM igra ključno vlogo pri ekosistemskih storitvah, rodovitnosti, zmogljivosti zadrževanja vode in kroženju ogljika. SOC lahko razdelimo na različne ogljikove frakcije, ki kažejo različno stabilnost in kemično sestavo, na katero različno vplivajo litološka zgradba, biološki in podnebni procesi. Boljše razumevanje SOC in vpliv različnih vrst matične podlage na ogljikove frakcije bi lahko olajšala oceno stabilnosti SOC. Ta študija preučuje koncentracije in dinamiko različnih frakcij SOC (npr. labilni organski ogljik, LOC; rekalcitrantni organski ogljik, ROC; organski ogljik, vezan na kalcij; organski ogljik, vezan na železo/aluminij, Fe/Al-SOC) v gozdnih prsteh in povezanost z različno litološko zgradbo v podobnih podnebnih razmerah. Prostorsko se študija osredotoča na območje klasičnega krasa. Koncentracija SOC in njegove frakcije so se z naraščajočo globino v vseh profilih zmanjšale, kar kaže na relativno uravnotežene profile prsti. Vrednosti SOC (9,7–45,5 g∙kg-1) so skladne z ugotovitvami drugih raziskav prsti v regiji. ROC in Fe/Al-SOC (51,5–65,8 % oziroma 68,0–73,3 %) sta bili glavni komponenti SOC, medtem ko je za Ca-SOC značilen bistveno nižji delež (6,4–7,4 %). Ključna dejavnika, ki vplivata na vsebnost SOC, sta vsebnost kalcita (izražen kot kalcijev oksid) in gline; tadva s SOC tvorita mineralne komplekse, ki stabilizirajo SOC. Vrednosti Fe2O3 in Al2O3 ne pojasnjujejo razlik SOC niti njegovih frakcij, kar je lahko posledica različnega vpliva kemičnih/mineralnih oblik železovih oz. aluminijevih spojin na reaktivnost. Prsti na karbonatnih kamninah, ki so bogatejše z delci velikosti glin in CaO, so imele zaradi višjih koncentracij stabiliziranih SOC frakcij za 6,35 g∙kg-1 (28 odstotnih točk) višje povprečne vrednosti SOC v primerjavi prstmi na siliciklastičnih (flišnih) kamninah. Rezultati kažejo, da sta osnovna dejavnika, ki vplivata na stabilizacijo SOM, litološka zgradba in pedogeneza.
Ključne besede: kraške prsti, organski ogljik v tleh, labilni organski ogljik, rekalcitrantni organski ogljik, organski ogljik, vezan na kalcij, organski ogljik, vezan na železo/aluminij. |
| first_indexed | 2024-04-10T16:51:31Z |
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| institution | Directory Open Access Journal |
| issn | 0583-6050 1580-2612 |
| language | English |
| last_indexed | 2024-04-10T16:51:31Z |
| publishDate | 2019-12-01 |
| publisher | Slovenian Academy of Sciences and Arts |
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| series | Acta Carsologica |
| spelling | doaj.art-f5fb60ddd0254530a7d3976905ee586e2023-02-07T17:18:13ZengSlovenian Academy of Sciences and ArtsActa Carsologica0583-60501580-26122019-12-0148310.3986/ac.v48i3.73056897Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW SloveniaHui YangMitja PrelovsekFen HuangChunlai ZhangJianhua CaoNataša RavbarSoil organic carbon (SOC) is a critical measure of soil organic matter (SOM) content. SOM plays a vital role in ecosystem services, soil fertility, soil water retention capacity, and carbon cycling. SOC can be partitioned into various carbon fractions, which exhibit diverse stability and chemical compositions that are influenced variably by lithology as well as biological and climatic processes. A better understanding of SOC and the influence of different bedrock types on carbon fractions could facilitate the evaluation of the fate and stability of SOC. The present study is focused on the concentrations and characteristics of different SOC fractions (e.g., Labile organic carbon, LOC; Recalcitrant organic carbon, ROC; Calcium-bound organic carbon, Ca-SOC; Iron/aluminium-bound organic carbon, Fe/Al-SOC) in forest soils associated with different bedrock lithology under similar climate conditions in the centre of the ‘Classical Karst’, and evaluates influence of the geological environment on SOC. SOC and SOC fraction concentrations decreased with an increase in depth in all profiles, indicating stabilized soil profiles. SOC values (9.7–45.5 g∙kg-1) were consistent with the findings of other studies on soils in the region. ROC and Fe/Al-SOC (51.5–65.8 % and 68.0–73.3 %, respectively) were the major SOC fractions, while Ca-SOC accounted for a considerably lower proportion (6.4–7.4 %) of the SOC contents. Key factors influencing SOC contents were calcite (expressed as calcium oxide) and clay contents, which represent mineral complexes stabilizing SOC. Overall Fe2O3 and Al2O3 concentration did not explain differences in SOC nor its fractions, potentially due to the importance of chemical/mineral forms of Fe- and Al-related minerals (reactivity). Soils on carbonate rocks, which are richer in clay and CaO, had 6.35 g∙kg-1 (28 percentage points) higher concentrations of SOC average when compared with soils on siliciclastic rock, due to higher concentrations of stabilized SOC fractions. The results demonstrate that bedrock lithology and pedogenesis are key factors influencing SOM stabilization. Key words: karst soil, soil organic carbon, labile organic carbon, recalcitrant organic carbon, calcium-bound organic carbon, iron/aluminium-bound organic carbon. Kvantifikacija in vrednotenje organskega ogljika in njegovih frakcij v tleh: primer s Klasičnega Krasa, JZ Slovenija Z meritvami organskega ogljika v prsteh (SOC) izražamo vsebnost organskih snovi v prsteh (SOM). SOM igra ključno vlogo pri ekosistemskih storitvah, rodovitnosti, zmogljivosti zadrževanja vode in kroženju ogljika. SOC lahko razdelimo na različne ogljikove frakcije, ki kažejo različno stabilnost in kemično sestavo, na katero različno vplivajo litološka zgradba, biološki in podnebni procesi. Boljše razumevanje SOC in vpliv različnih vrst matične podlage na ogljikove frakcije bi lahko olajšala oceno stabilnosti SOC. Ta študija preučuje koncentracije in dinamiko različnih frakcij SOC (npr. labilni organski ogljik, LOC; rekalcitrantni organski ogljik, ROC; organski ogljik, vezan na kalcij; organski ogljik, vezan na železo/aluminij, Fe/Al-SOC) v gozdnih prsteh in povezanost z različno litološko zgradbo v podobnih podnebnih razmerah. Prostorsko se študija osredotoča na območje klasičnega krasa. Koncentracija SOC in njegove frakcije so se z naraščajočo globino v vseh profilih zmanjšale, kar kaže na relativno uravnotežene profile prsti. Vrednosti SOC (9,7–45,5 g∙kg-1) so skladne z ugotovitvami drugih raziskav prsti v regiji. ROC in Fe/Al-SOC (51,5–65,8 % oziroma 68,0–73,3 %) sta bili glavni komponenti SOC, medtem ko je za Ca-SOC značilen bistveno nižji delež (6,4–7,4 %). Ključna dejavnika, ki vplivata na vsebnost SOC, sta vsebnost kalcita (izražen kot kalcijev oksid) in gline; tadva s SOC tvorita mineralne komplekse, ki stabilizirajo SOC. Vrednosti Fe2O3 in Al2O3 ne pojasnjujejo razlik SOC niti njegovih frakcij, kar je lahko posledica različnega vpliva kemičnih/mineralnih oblik železovih oz. aluminijevih spojin na reaktivnost. Prsti na karbonatnih kamninah, ki so bogatejše z delci velikosti glin in CaO, so imele zaradi višjih koncentracij stabiliziranih SOC frakcij za 6,35 g∙kg-1 (28 odstotnih točk) višje povprečne vrednosti SOC v primerjavi prstmi na siliciklastičnih (flišnih) kamninah. Rezultati kažejo, da sta osnovna dejavnika, ki vplivata na stabilizacijo SOM, litološka zgradba in pedogeneza. Ključne besede: kraške prsti, organski ogljik v tleh, labilni organski ogljik, rekalcitrantni organski ogljik, organski ogljik, vezan na kalcij, organski ogljik, vezan na železo/aluminij.https://ojs.zrc-sazu.si/carsologica/article/view/7305 |
| spellingShingle | Hui Yang Mitja Prelovsek Fen Huang Chunlai Zhang Jianhua Cao Nataša Ravbar Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia Acta Carsologica |
| title | Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia |
| title_full | Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia |
| title_fullStr | Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia |
| title_full_unstemmed | Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia |
| title_short | Quantification and evaluation of soil organic carbon and its fractions: case study from the Classical Karst, SW Slovenia |
| title_sort | quantification and evaluation of soil organic carbon and its fractions case study from the classical karst sw slovenia |
| url | https://ojs.zrc-sazu.si/carsologica/article/view/7305 |
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