Mud‐associated organic matter and its direct and indirect role in marsh organic matter accumulation and vertical accretion

2020 ◽  
Vol 65 (11) ◽  
pp. 2627-2641 ◽  
Author(s):  
G. Mariotti ◽  
T. Elsey‐Quirk ◽  
G. Bruno ◽  
K. Valentine
Keyword(s):  
Organic Matter ◽  
Vertical Accretion ◽  
Organic Matter Accumulation

Oxidases and hydrolases mediate soil organic matter accumulation in chernozem of northeastern China

Geoderma ◽  
2021 ◽  
Vol 403 ◽  
pp. 115206
Author(s):  
Guohui Wu ◽  
Zhenhua Chen ◽  
Dongqi Jiang ◽  
Nan Jiang ◽  
Hui Jiang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Northeastern China ◽  
Organic Matter Accumulation

scholarly journals Contributions of Organic and Mineral Matter to Vertical Accretion in Tidal Wetlands across a Chesapeake Bay Subestuary

2021 ◽  
Vol 9 (7) ◽  
pp. 751
Author(s):  
Jenny R. Allen ◽  
Jeffrey C. Cornwell ◽  
Andrew H. Baldwin
Keyword(s):  
Organic Matter ◽  
Sea Level Rise ◽  
Chesapeake Bay ◽  
Sea Level ◽  
210Pb Dating ◽  
Sediment Supply ◽  
Mineral Matter ◽  
Tidal Wetlands ◽  
Vertical Accretion ◽  
Inorganic Matter

Persistence of tidal wetlands under conditions of sea level rise depends on vertical accretion of organic and inorganic matter, which vary in their relative abundance across estuarine gradients. We examined the relative contribution of organic and inorganic matter to vertical soil accretion using lead-210 (210Pb) dating of soil cores collected in tidal wetlands spanning a tidal freshwater to brackish gradient across a Chesapeake Bay subestuary. Only 8 out of the 15 subsites had accretion rates higher than relative sea level rise for the area, with the lowest rates of accretion found in oligohaline marshes in the middle of the subestuary. The mass accumulation of organic and inorganic matter was similar and related (R2 = 0.37). However, owing to its lower density, organic matter contributed 1.5–3 times more toward vertical accretion than inorganic matter. Furthermore, water/porespace associated with organic matter accounted for 82%–94% of the total vertical accretion. These findings demonstrate the key role of organic matter in the persistence of coastal wetlands with low mineral sediment supply, particularly mid-estuary oligohaline marshes.

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