PROBLEM TO BE SOLVED: To provide a water microbial carrier material and a water microbial induced proliferation method in which a water purification effect can be maintained over a long term in a closed water system and an open water system, can be executed at low cost and the utilization of bamboo is made possible.SOLUTION: A water microbial carrier material is formed such that cotton-shaped green bamboo fibers obtained by compressing and pulverizing the green bamboo culm so as to cleave the cell walls of fibrous cells are filled in the inside of a bag body and sealed. This water microbial carrier material is submerged underwater. The water microorganisms enter the cleaved fiber cell walls are fixed and propagated to form an ecosystem in this. By this ecosystem, the underwater organic matter is decomposed efficiently, and underwater eutrophication is suppressed to promote water purification. The bamboo fibers take around several years to corrosion/disappearance, and therefore the microorganism carrier can be maintained for several years without disappearance. Also, the nitrogen fixing bacteria generated in the cell walls are brought into nitrogen fixation in a natural environment water area, and the propagation of aquatic plants is promoted. The propagated aquatic plants take underwater phosphate ions therein, and the underwater eutrophication is suppressed.SELECTED DRAWING: Figure 1【課題】閉鎖水系や開放水系で長期に亘り水質浄化効果を維持でき、低コストに実施可能で竹の有効活用が可能な水中微生物担体資材及び水中微生物誘導増殖方法の提供。【解決手段】生竹稈を繊維細胞の細胞壁が裂開するよう圧縮粉砕した綿状生竹繊維を袋体の内部に充填し封止し水中微生物担体資材とする。この水中微生物担体資材を水中に沈設する。水中微生物は、裂開した繊維細胞壁内に入り込み定着・繁殖しこの中で生態系を形成する。この生態系により水中の有機物は効率的に分解され、水中の富栄養化が抑制されて水質浄化が促進される。竹繊維は腐食・消失までに数年程度かかり、数年に亘り微生物担体は消失せずに維持される。また、自然環境水域では細胞壁内に発生する窒素固定菌が窒素固定し、水生植物の繁殖を促し、繁殖した水生植物が水中のリン酸イオンを取り込み、水中の富栄養化が抑制される。【選択図】図１
