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83
to be ascribed in part to the formation of carbon dioxide. Accor-
ding to the researches of BonNEMANN (1920) the CO, concentralion
over manured ground may rise considei rably above the normal.
By the sea-shore the seaweed cast up acls as natural manure.
Especially when the beds of seaweed on low- lying and protected
shores decompose into mud are enormous quantities of CO,
deve-
loped. The figures given on p. 68 show that the CO,
produc lion of
Photo, the author
Fig 9. The vegetation on the fucoid mud on the shore. The plants are Nasturtium
palustre, Rumex maritimus, Ranunculus sceleratus and Bidens tripartita.
the decomposed sea weed considerably exceeds that of the best forest-
mould. The luxuriant vegetation on the damp beds of seaweed
and mud is doubtless partly due to this fact. The wind naturally
prevents the occurrence of very great CO, tension in the air, but
since prostrate forms predominate in the shore-vegetation, and espe-
cially in the seaweed, a part of the upward-diffusing carbon dioxide
must naturally succeed in being absorbed through the stomata of the
under sides of the leaves. These prostrate shore-plants are therefore
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