Salt marshes are transitional areas between land and water, occurring along the intertidal shore of estuaries and sounds where salinity (salt content) ranges from near ocean strength to near fresh in upriver marshes. Salinity, frequency and extent of flooding of the marsh determine the types of plants found there. Salt marshes rank among the most productive ecosystems on earth. Smooth cordgrass (Spartina alterniflora), dominates the regularly flooded lowmarsh. Dead marsh plants are a source of nourishment for many other species. An important component of marsh soils is macro-organic matter (MOM), which accounts for a significant portion of the N (2-22%), P (1-7%) and organic C (6-45%) stored in marsh soils. In New Zealand, the cordgrass, Spartina anglica as introduced from England into the Manawatu River mouth during 1913 to try and reclaim the estuary land for farming. This clearly suggests that saltmarshes can have manuring impact.
.http://www.int-res.com/articles/meps2005/299/m299p123.pdf
This is very good question. There are two types of salt tolerant plants regarding their mechanism. One type takes the salts but push these into vacuoles or again spread back into the soil while others take up very little salt through avoiding mechanisms. Mr. Tripathi replied the question in a greater detail. Yes, I agree that salt content in the dead grass will depend upon salinity of water and soil. Therefore, the grass must be analysed for salts before using as source of organic matter. Please be aware if you want to compost this grass because the salt content of compost are even normally high. If this care is taken, this grass can be a very good source of organic matter.
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