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- W2065566002 abstract "An underground biomass profile and productivity study involved year‐long sampling programs in 18 stands of salt marsh plants in Georgia, Delaware, and Maine. As the result of the monthly or bimonthly marsh coring program three types of underground biomass profiles were found. In the first, the concentration of macro‐organic matter (MOM) was uniform with depth; the notable example of this type was creekbank Spartina alterniflora in the southern part of the coast. A second type had a high MOM concentration at the surface which decreased with depth. This, the most common type of profile, was exemplified by Spartina patens, S. alterniflora from the high marsh along the southern coast (Georgia), and creekbank S. alterniflora from the northern part of its range (Maine). The third type of profile was seen where a large rhizome mat developed 15–20 cm below the surface. Spartina cynosuroides and Phragmites communis were typical examples of this type of profile, resulting in a low biomass at the surface, a higher biomass somewhat below the surface, and a low concentration at depth. The annual maxima and minima of MOM biomass were used to calculate annual increments, which can be considered minimum annual production values. These productivity values ranged from a low of 80 g C/m 2 for creekhead S. alterniflora in Maine to a high of 1690 g C/m 2 for Juncus gerardi in Maine. The mean for all plant stands was 650 g C/m 2 . Since the average carbon content of the MOM was 35.3%, this corresponds to 1850 g dry weight/m 2 per year. As a measure of the relative activity of the total pool of macro‐organic material in the soil, turnover times were calculated by dividing the total macro‐organic matter by the annual increments. Within the MOM pool there are several components with turnover times varying from days to years. The turnover time for the entire pool ranged from 18 months in two Georgia salt marsh plant stands to 224 months for one in Maine. In the two instances where values for a species could be compared between Maine and Georgia, the turnover time was shorter at the more southerly site. These results can probably be attributed to slower microbial decay rates in the cooler climate. In Georgia and Maine where the turnover values for a species were determined for two elevations, the time was shorter at the lower elevation." @default.
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- W2065566002 date "1979-02-01" @default.
- W2065566002 modified "2023-10-16" @default.
- W2065566002 title "UNDERGROUND BIOMASS PROFILES AND PRODUCTIVITY IN ATLANTIC COASTAL MARSHES" @default.
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- W2065566002 doi "https://doi.org/10.1002/j.1537-2197.1979.tb06208.x" @default.
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