Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Impact of Amendments on Microbial Biomass, Enzyme Activity and Bacterial Diversity of Soils in Long-term Rice Field Experiment

개량제 장기 연용이 논토양의 미생물체량, 효소활성 및 세균 다양성에 미치는 영향

  • Suh, J.S. (National Academy of Agricultural Science, R.D.A.) ;
  • Noh, H.J. (National Institute of Horticultural and Herbal Science, R.D.A.) ;
  • Kwon, J.S. (National Academy of Agricultural Science, R.D.A.)
  • Received : 2009.06.05
  • Accepted : 2009.08.03
  • Published : 2009.08.28
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Abstract

The long-term effects of soil management history on microbial communities are still poorly understood. Our objectives were to determine the impact of long-term application of soil amendments on microbial communities in rice paddy fields. The treatments selected were control where crops were grown without any nutrient application (CON); nitrogen-phosphorus-potassium (NPK); NPK plus compost (CNPK); NPK plus lime (LNPK); and NPK plus silicate (WNPK). The long-term addition of organic and inorganic amendments significantly changed soil chemical properties. The amount of organic carbon increased in the treatments with fertilizer and amendments over that in the soil without inputs. However, we could not observe the differences of bacterial population among the treatments, but the number of aerobic bacteria increased by the addition of amendments. Isolates from the rice paddy soils before irrigation were Dactylosporangium, Ewingella, Geobacillus, Kocuria, Kurthia, Kytococcus, Lechevalieria, Micrococcus, Micromonospora, Paenibacillus, Pedobacter, Pseudomonas, Pseudoxanthomonas, Rhodococcus, Rothia, Sphingopyxis, Stenotrophomonas, and Variovorax. Dominant genera were Arthrobacter, Kocuria, Kurthia, and Bacillus in the long-term field. Microbial biomass was the highest in the compost treatment (CNPK), and was the lowest in the CON. Dehydrogenase activity in soils treated with rice compost straw was the highest and the activity showed an increasing trend according to treatment as follows: CON < WNPK < NPK = LNPK < CNPK. These results demonstrate that soil management practice, such as optimal application of fertilizer and amendment, that result in accumulations of organic carbon may increase microbial biomass and dehydrogenase activity in long-term rice paddy soils.

토양미생물 군락에 대한 유기물 및 비료의 장기 연용 효과를 평가하고자 동일비료연용 논토양을 대상으로 미생물상, 미생물체량 및 세균 군락의 상호관계에 대해 조사하였다. 유기태 탄소함량은 비료를 연용한 곳 보다 볏짚 퇴비를 시용한 처리구에서 높았다. 토양 세균수는 무비구와 화학비료 시용구에 비해 퇴비, 석회, 규산을 병용한 처리구에서 비교적 높았다. 영년동일 논토양에서 Dactylosporangium, Ewingella, Geobacillus, Kocuria, Kurthia, Kytococcus, Lechevalieria, Micrococcus, Micromonospora, Paenibacillus, Pedobacter, Pseudomonas, Pseudoxanthomonas, Rhodococcus, Rothia, Sphingopyxis, Stenotrophomonas, Variovorax 등의 세균이 분리되었으며, Arthrobacter, Kocuria, Kurhtia 및 Bacillus 등의 세균이 우점하였다. 미생물체량 및 탈수소효소 활성은 볏짚퇴비 시용구에서 가장 높았다.

Keywords

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