Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Differences in Biogeochemical Properties and Microbial Activities in Stream Segments with Changes in Land-use Type

  • Kim, Jinhyun (School of Civil and Environmental Engineering, Yonsei University) ;
  • Jang, Inyoung (National Institute of Ecology) ;
  • Lee, Hyunjin (School of Civil and Environmental Engineering, Yonsei University) ;
  • Kang, Hojeong (School of Civil and Environmental Engineering, Yonsei University)
  • Received : 2015.08.19
  • Accepted : 2015.09.20
  • Published : 2015.09.30
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Abstract

Changes in land-use type can affect soil and water properties in stream ecosystems. This study examined the effects of different land-use types on biogeochemical properties and microbial activities of a stream. We collected water and sediment samples in a stream at three different sites surrounded by varying land-use types; a forest, a radish field and a rice paddy. Nitrogen contents, such as nitrate, nitrite and total nitrogen in the stream water body, showed significant differences among the sampling sites. The highest nitrogen values were recorded at the site surrounded by cropland, as fertilizer runoff impacted the stream. Soil organic matter content in the sediment showed significant differences among sites, with the highest content exhibited at the forest mouth site. These differences might be due to the organic matter in surrounding terrestrial ecosystems. Microbial activities determined by extracellular enzyme activities showed similar values throughout all sites in the water body; however, the activities in the sediments exhibited the highest values near the forest site and mirrored the soil organic matter content values. From these results, we conclude that different land-use types are important factors affecting water and sediment properties in stream ecosystems.

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References

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