One object of the present invention is to provide means for readily attaining a large scale cultivation of sphagnum moss under various conditions, in other words, means for establishing a sphagnum field under various conditions. Specifically, the present inventors have found that the above object can be attained through provision of a sphagnum cultivation base having a shape-imparted, aggregated mass of dried sphagnum and one or more units of live sphagnum whose stem portions have been aligned in bunch(es), such that the bunch(es) of live sphagnum stem is/are in contact with the aggregated mass of dried sphagnum, that the growth point of of live sphagnum is substantially exposed from the aggregated mass of dried sphagnum, and that the aggregated mass of dried sphagnum is capable of being brought into contact with water of a water basin, and through construction of a system on the basis of the base. The present invention can considerably contribute to environmental improvements, since, in particular, the present invention can grow sphagnum having a remarkable carbon dioxide fixation capacity. IMAGE
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