\u6d77\u6c34\u4e2d\u306e\u9244\u4e0d\u8db3\u306f\u85fb\u5834\u8870\u9000\u306e\u4e00\u56e0\u3068\u3055\u308c\uff0c\u30b3\u30f3\u30d6\u914d\u5076\u4f53\u306e\u6210\u719f\u306b\u9244\u304c\u5fc5\u8981\u306a\u3053\u3068\u304c\u793a\u3055\u308c\u3066\u3044\u308b \u307b\u304b\uff0c\u6d77\u57df\u3067\u3082\u88fd\u92fc\u30b9\u30e9\u30b0\u7cfb\u306e\u9244\u5206\u4f9b\u7d66\u65bd\u80a5\u6750\u306e\u6295\u5165\u3067\u30b3\u30f3\u30d6\u7fa4\u843d\u304c\u56de\u5fa9\u3057\u305f\u3068\u306e\u5831\u544a\u3082\u3042\u308b\uff0e \u3053 \u306e\u65bd\u80a5\u6750\u306e\u85fb\u985e\u3078\u306e\u5f71\u97ff\u3092\u8a73\u7d30\u306b\u8abf\u3079\u308b\u305f\u3081\uff0c\u6e05\u6d44\u304b\u3063\u6804\u990a\u5869\uff08total inorganic N, Phosphate-P, <\/p>\n
Silicate-Si\uff09\u304c\u8c4a\u5bcc\u3067\u9244\u6fc3\u5ea6\u304c\u4f4e\u3044\u5bcc\u5c71\u6e7e\u6df1\u5c64\u6c34\u3092\u7528\u3044\uff0c\u5c4b\u5185100L \u900f\u660e\u6c34\u69fd4 \u57fa\uff08\u65bd\u80a5\u3068\u906e\u5149\u306e\u6709\u7121\uff09\u3068\u5c4b\u59162000 L, FRP \u6c34\u69fd2 \u57fa\uff08\u65bd\u80a5\u306e\u6709\u7121\uff09\u3067\u30d0\u30c3\u30c1\u57f9\u990a\u3092\u884c\u3063\u305f\uff0e \u65bd\u80a5\u6c34\u69fd\u3067\u306f\u9244\u3068\u6804 \u990a\u5869\u306e\u6fc3\u5ea6\u304c\u4e0a\u6607\u3057\uff0c\u7121\u906e\u5149\u3067\u306f\u4e3b\u306b\u73ea\u85fb\u304c\u5897\u3048\u305f\uff0e\u73ea\u85fb\u306f\u906e\u5149\u30fb\u65bd\u80a5\u6c34\u69fd\u3067\u3082\u5897\u3048\uff0c\u5f93\u5c5e\u6804\u990a\u304c \u793a\u5506\u3055\u308c\u305f\uff0e\u7121\u906e\u5149\u6c34\u69fd\u306b\u5165\u308c\u305f\u30de\u30b3\u30f3\u30d6\u306e\u672a\u6210\u719f\u914d\u5076\u4f53\u306f\u3059\u3079\u3066\u6210\u719f\u3057\u5e7c\u80de\u5b50\u4f53\u304c\u51fa\u73fe\u3057\u305f\uff0e\u305d \u306e\u4f53\u8272\u304c\u6fc3\u304f\u5bc6\u5ea6\u304c\u9ad8\u304b\u3063\u305f\u306e\u306f\uff0c\u5c4b\u5185\u3067\u306f\u65bd\u80a5\uff0c\u5c4b\u5916\u3067\u306f\u975e\u65bd\u80a5\u6c34\u69fd\u3067\uff0c\u5f8c\u8005\u306f\u73ea\u85fb\u306e\u7e41\u8302\u306b\u3088 \u308b\u5149\u4e0d\u8db3\u304c\u539f\u56e0\u3068\u8003\u3048\u3089\u308c\u305f\uff0e \u6d77\u57df\u306e\u65bd\u80a5\u6295\u5165\u5730\u70b9\u3067\u3082\u65bd\u80a5\u6750\u306b\u3088\u308b\u5fae\u7d30\u85fb\u3068\u5927\u578b\u85fb\u306e\u5897\u6b96\u52b9\u679c\u304c \u671f\u5f85\u3067\u304d\u308b\u304c\uff0c\u4e21\u8005\u306e\u7af6\u5408\u3082\u61f8\u5ff5\u3055\u308c\u305f\uff0e<\/p>\n
The deficiency of iron in seawater has been considered as a factor of the reduction of kelp beds. In vitro culture has demonstrated the requirement of iron in maturation of kelp gametophyte; in situ fertilization, i.e., deployment of iron-enriched fertilizer (mixture of con-verter-derived steelmaking slag and mixed with humus) has suggested their positive effects on restoration of kelp beds. However, the gap between the former simplified and the latter complicated conditions have made it difficult to evaluate the results of fertilization. In the present study, a closed fertilization experiments in indoor and outdoor tanks using Toyama Bay deep seawater (known as clean, stable and enriched seawater with less iron concentra-tion than surface seawater) to detect any positive effects on algae caused by the iron-enriched fertilizer. Four 100 L translucent tanks (with or without fertilizer and blackout cover) and two 2000 L FRP tanks (with or without fertilizer) were used for batch cultures in the indoor and outdoor experiments, respectively. In both experiments, elevation of iron and macronutrients (total inorganic N, Phosphate-P, Silicate-Si) were detected and diatom (and green microalgae in one tank) increased to higher concentrations in open fertilized tanks. Diatom also increased in dark and fertilized tanks presumably because of hetero– trophy. All of the immature gametophyte of\u306cccharina\u30ebponica deployed in the open tanks could produce young sporophytes; the color of sporophyte was deeper and its density was higher in the fertilized tank in the indoor experiment and unfertilized tank in the outdoor experiment. The latter unexpected result might be caused by short of light with vigorous coverage of diatom. These experiments suggest the positive micro- and macroalgal response to iron-enriched fertilizer as well as the competition between them near the fertilized spot at sea.<\/p>\n","protected":false},"excerpt":{"rendered":"
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