Mud-bottom hollows are depressions on the bog surface where Sphagnum mosses have died and peat ac... more Mud-bottom hollows are depressions on the bog surface where Sphagnum mosses have died and peat accumulation is retarded or even replaced with loss by oxidation. Results of measurements carried out at Männikjärve Bog, central Estonia, con” rmed that peat accumulation has stopped and that in 1999–2001 the uppermost 2–3 cm thick surface layer of mud-bottom hollows became thinner by 1.95 6 0.75 mm yr21 (n = 188). Different methods revealed the corresponding carbon loss from the mud-bottom hollows 25 mm thick surface layer as 50–60 g C m22 yr21. As a result, the surface of mud-bottom hollows becomes lower as compared to surroundings with peat accumulation c. 1.5 mm yr21, and they are likely to have an important role in the differentiation of bog microtopography. Owing to the combination of a cessation in peat accumu lation, carbon loss by oxidation and increased emission of decomposition gases, mud-bottom hollows could have an important in‘ uence on the carbon budget of bogs.
Geochemistry data of a high-resolution peat core from the Past Global Changes - Carbon in Peat on... more Geochemistry data of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project
Calibrated ages of a high-resolution peat core from the Past Global Changes - Carbon in Peat on E... more Calibrated ages of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project
Mud-bottom hollows with bare peat surface are common features of raised bogs in the boreal zone. ... more Mud-bottom hollows with bare peat surface are common features of raised bogs in the boreal zone. Due to retarded peat accumulation, these hollows promote changes in plant cover, microtopography and carbon accumulation. We undertook a 16-year study of eight permanent plots in mud-bottom hollows to assess their durability, regularities and causes of development. Annual changes in the areas of plant assemblage types in the plots averaged around 20 %, and changes during the entire study period approached 90 %. Bare peat surfaces existed for 3–12 years on average before being overgrown by lateral expansion of the bordering Sphagnum carpet (average rate of advance 4.1 ± 1.3 cm yr-1) or by clumps of Rhynchospora alba. The annual changes in representation of plant assemblages fluctuated through time and were related to weather factors. The overgrowth of bare peat by Sphagnum carpet was favoured by wetter conditions, whereas overgrowth by the R. alba dominated plant assemblage was temporally...
Mud-bottom hollows are depressions on the bog surface where Sphagnum mosses have died and peat ac... more Mud-bottom hollows are depressions on the bog surface where Sphagnum mosses have died and peat accumulation is retarded or even replaced with loss by oxidation. Results of measurements carried out at Männikjärve Bog, central Estonia, con” rmed that peat accumulation has stopped and that in 1999–2001 the uppermost 2–3 cm thick surface layer of mud-bottom hollows became thinner by 1.95 6 0.75 mm yr21 (n = 188). Different methods revealed the corresponding carbon loss from the mud-bottom hollows 25 mm thick surface layer as 50–60 g C m22 yr21. As a result, the surface of mud-bottom hollows becomes lower as compared to surroundings with peat accumulation c. 1.5 mm yr21, and they are likely to have an important role in the differentiation of bog microtopography. Owing to the combination of a cessation in peat accumu lation, carbon loss by oxidation and increased emission of decomposition gases, mud-bottom hollows could have an important in‘ uence on the carbon budget of bogs.
Geochemistry data of a high-resolution peat core from the Past Global Changes - Carbon in Peat on... more Geochemistry data of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project
Calibrated ages of a high-resolution peat core from the Past Global Changes - Carbon in Peat on E... more Calibrated ages of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project
Mud-bottom hollows with bare peat surface are common features of raised bogs in the boreal zone. ... more Mud-bottom hollows with bare peat surface are common features of raised bogs in the boreal zone. Due to retarded peat accumulation, these hollows promote changes in plant cover, microtopography and carbon accumulation. We undertook a 16-year study of eight permanent plots in mud-bottom hollows to assess their durability, regularities and causes of development. Annual changes in the areas of plant assemblage types in the plots averaged around 20 %, and changes during the entire study period approached 90 %. Bare peat surfaces existed for 3–12 years on average before being overgrown by lateral expansion of the bordering Sphagnum carpet (average rate of advance 4.1 ± 1.3 cm yr-1) or by clumps of Rhynchospora alba. The annual changes in representation of plant assemblages fluctuated through time and were related to weather factors. The overgrowth of bare peat by Sphagnum carpet was favoured by wetter conditions, whereas overgrowth by the R. alba dominated plant assemblage was temporally...
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