報告書番号

U87020

タイトル（和文）

石炭灰埋立地被覆用牧草の選択

タイトル（英文）

SCREENING OF GROUND COVER CROPS FOR FLY ASH DISPOSAL AREA

概要 （図表や脚注は「報告書全文」に掲載しております）

環境保全対策と同時に景観保全対策手段の一つともなる埋立地の早期被覆方法を検討する一環として，石炭灰上での生育が良好な植物の抽出と覆土の影響について，ポット栽培試験により実験的に検討した。マメ科の牧草は，石炭灰に移植した方が対照よりも地上部の乾物重量が多く，また，石炭灰上では施肥しなくても，施肥した対照と同程度かそれ以上の乾物重量が得られた。イネ科牧草の中ではベネニアルライグラスが石炭灰上でも対照と同程度の乾物重量を示したが，供試した他のイネ科牧草は，全般的に生育が不良であった。シロクローバは，石炭灰上に最小限の覆土を設けることによって生育が良好となるため，石炭灰埋立地の早期被覆に利用可能であると考えられた。

概要 （英文）

CURRENTLY,AMOUNT OF FLY ASH PRODUCTION IN COAL POWER GENERATION IN JAPAN HAS REACHED ABOUT 4 MILLION METRIC TONS A YEAR. ALTHOUGH ABOUT HALF OF THEM HAS BEEN UTILIZED,THE OTHER HALF HAS BEEN DISPOSED OF AS AN INDUSTRIAL WASTE MATERIAL INTO LANDFILL AREAS. MOST OF FLY ASH AS A BY-PRODUCT OF COAL COMBUSTION HAVE HIGT PH VALUES AND HIGHER BORON CONCENTRATION,DEPENDING ON THE COAL SOURCES,THAN THOSE OF COMMON ACIDIC JAPANESE SOILS.THREFORE,LARGE FLY ASH DISPOSAL AREAS HAVE UNIQUE ECOLOGICAL AND ENVIRONMENTAL CHARACTERISTICS:LESS NITROGEN AND ORGANIC MATTERS,EXCESS BORON IN THE SURFACE CLAYER FOR PLANT GROWTH.THIS REPORT DESCRIBES RESULTS OF SCREENING EXPERIMENTS OF GROUND COVERCROPS TOLERANT TO HIGH ALKALINE FLY ASH AND THEIR POTENTIAL TO ACCELERATE REVEGETATION FOR LANDFILL AREAS. YOUNG SEEDLINGS OF FORAGE CROPS:7 LEGUMES AND 13 GRASSES,WERE TRANSPLANTED INTO THE FLY ASH MEDIA. SCREENING EXPERIMENTS SHOWED THAT WHITE CLOVER HAS GREATEST POTENTIAL FOR ADAPTABILITY TO FLY ASH WITHOUT ANY FERTILIZATION,HOWEVER,GRASSES REQUIREDPROPER FERTILIZER APPLICATION,ESPECIALLY NITROGEN. ALTHOUGH WHITE CLOVER SEEDS WERE DIRECTLY SOWN ON ONLY 2-5 CM SURFACE SOIL LAYER OVER THE FLY ASH,PLANT GROWTH PERFORMANCE WAS SIGNIFICANTLY BETTER THAN THOSE OFPLANTS GROWN ON SOIL LAYER WITHOUT ANY FLY ASH. THESE PRELIMINARY EXPERIMENTAL RESULTS SUGGEST THAT AN INTRODUCTION OF WHITE CLOVER INTO FLY ASH DISPOSAL AREAS MAY PROMOTE REVEGETATION AND IMPROVE AESTHETIC PROPERTIES.

報告者

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