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• W2079554174 abstract "Knowledge of the crop-size and vertical profile with respect to sea level of dead leaf blades and other shoot parts of saltmarsh grasses is a prerequisite for projections of seawater impact upon saltmarsh grass-shoot decomposers. We measured seasonal changes in quantities of leaf blade and leaf sheath+stem of smooth cordgrass in southern temperate saltmarshes of three types: low- (LD), mid- (MD), and high-drainage (HD) marshes (i.e., with low to high densities of drainage creeks). In each type of marsh, we took samples in the three characteristic subsites, short-shoot, intermediate-height, and tall-shoot. Wholly dead (brown) and living (some green) shoots were counted and their canopy heights measured, and the mass of all shoots was measured in 10-cm height increments (above sediment), with separation of living and dead parts. Detached material was also quantified, separated into that trapped in the canopy, and that prostrate on the sediment. Extent of marsh drainage did not affect the density of wholly dead shoots, which ranged from an average of 51 m−2 in autumn to 103 m−2 in spring, and 57 m−2 in tall subsites to 89–96 m−2 in short and intermediate subsites. The top of the dead-shoot canopy was about 20 cm taller than the living-shoot canopy in winter/spring, but was below it (x̄≈50 cm) in summer/autumn. The mass of standing-dead leaf blades was 4- to 5-fold greater in winter than in summer, and it was about 2.5-fold greater at tall than at short sites. Detached litter trapped among shoots above the sediment averaged 26% of total dead-shoot mass, but litter lying on the sediment averaged only 6% of total dead-shoot mass. Since export of macrodetritus from marshgrass stands is inconsequential, the small prostrate-litter mass implies that breakdown of shoots to small particles takes place within the vegetated marsh, and that standing decay predisposes fallen material to rapid disintegration. Comparison of heights of usual tidal contact on shoots at the short- and tall-shoot subsites showed that projected impacts of seawater upon leaf-blade decay would be greater at short-shoot subsites (high marsh) than at tall-shoot subsites (low marsh). This was because the vertical profile of dead-blade mass resulted in more of the short-shoot dead-blade mass residing within the vertical span most regularly contacted by flooding tides." @default.
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• W2079554174 date "1998-04-01" @default.
• W2079554174 modified "2023-09-26" @default.
• W2079554174 title "Seasonal and vertical demography of dead portions of shoots of smooth cordgrass in a south-temperate saltmarsh" @default.
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• W2079554174 doi "https://doi.org/10.1016/s0304-3770(98)00052-7" @default.
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