• The Korean Journal of Ecology
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• 제20권5호
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• pp.375-384
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• 1997

The effects of three different irrigating water qualities(clean water, life sewage and animal sewage) on the pattern of arthropod communities in the rice fields were investigated at Banwol, Kyonggi-do, mid-western part of Korea from 1994 to 1996. The total density of arthropod was highest in the rice field which was irrigated with clean water(clean water field), and the arthropod community was mainly composed of aphids and collembolans. Each functional group was found in the order of 'pests>non-pests>natural enemies' in its density. The dominant taxa in the pest group were aphids, planthoppers(Delphacidae), leafhoppers(Cicadelidae) and rice water weevil(L. oryzophilus). In the non-pest group collembolans, non-biting midges and dipterans were main arthropods, and in the natural enemy group Araneae was the dominant taxon. In the early growth stage of rice plant the dominant functional group was pests, and in the mid growth stage both the pest and the natural enemy group became dominant. But in the late growth stage none of the functional group was dominant over the other functional groups. The densities of spiders were much more higher in the clean water field than in the other fields. And through all the growth stages of rice plants the density of spiders in clean water field kept increase in contrast to the others. The species composition of spiders in the life sewage field was similar to that in the animal sewage field, but in the clean water field it was different from the other two fields.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권7호
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• pp.34-42
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• 2015

Feasibility tests for the hydraulic fracturing were conducted in order to secure additional saline groundwater for irrigating to the land-based aquaculture farm. Two boreholes were placed to the aquaculture farm A and B, respectively. A hydraulic fracturing using single packer was applied to major fracture zones within two boreholes. To identify effects of hydraulic fracturing on securing additional saline groundwater, some selective methods including well logging methods, pumping tests, and groundwater quality analysis were commonly applied to the boreholes before and after the hydraulic fracturing. Enlarging/creating fracture zones, increasing water contents in bedrock near boreholes, and increasing transmissivity were observed after the hydraulic fracturing. Even though the hydraulic fracturing could be an alternative to secure additional saline groundwater to the land-based aquaculture farm, salinity of the groundwater did not meet optimal thresholds for each fingerling in two farms: Fresh submarine groundwater discharge flowed the more into borehole of the farm A that resulted in decreasing a salinity value. Increased saline groundwater quantity in the borehole of the farm B rarely affect to the salinity. Although salinity problem of groundwater limited its direct use for the farms, the mixing with seawater could be effectively used for the fingerlings during the early stage. A horizontal radial collector well placed in the alluvial layer could be an alternative for the farms as well.

• 한국농공학회지
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• 제11권1호
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• pp.1549-1560
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• 1969

본시험(本試驗)은 단수시기(斷水時期)와 단수일수(斷水日數)를 달리하였을 때 수도생육(水稻生育) 및 수량(收量)에 미치는 영향(影響)을 구명(究明)하기 위(爲)하여 농림부(農林部)의 연구조성비(硏究助成費)로서 실시(實施)한것인데 그 결과(結果)를 요약(要約)하면 다음과 같다. (1) 기상상황(氣象狀況)은 본년(本年)은 영양생장기(榮養生長期)에 고온적우(高溫適雨)이고 생식생장기(生殖生長期)는 다우과조(多雨寡照)로 특히 감수분열기(減水分裂期)와 성숙기(成熟期)에 다우과조(多雨寡照)였으나 수도작작황(水稻作作況)에는 평년(平年)과 대차(大差)가 없었다. (2) 관개수질(灌漑水質)은 중성(中性)으로 양호(良好)하였다. (3) 본시험포(本試驗圃)의 토질(土質)은 비옥도(肥沃度)가 양호(良好)한 편(便)이고 일반답(一般畓) 토양(土壤)과 비슷한 성질(性質)의 것이었다. (4) 분얼기(分蘖期)의 생육상황(生育狀況)은 일반적(一般的)으로 단수시기(斷水時期)가 빠르고 단수일수(斷水日數)가 긴 것이 불량(不良)하였다. (5) 출수상황(出穗狀況)에서 간단관수일수(間斷灌水日數)가 길수록 출수시(出穗始) 출수기(出穗期)가 1일정도(日程度) 늦어지는 경향이었다. (6) 성숙기(成熟期)의 생육(生育) 및 수량상황(收量狀況)에서 단수시기별(斷水時期別)을 보면 간장(稈長)은 단수시기(斷水時期)를 빨리한 것이 짧은 경향이고 수장(穗長)에는 별차이(別差異)가 없었다. 수수(穗數) 입수(粒數) 정조중(正租重)은 단수시기(斷水時期)가 빠를수록 그 영향이 커서 감소(減少)되는 경향이나 얼중(蘖重)은 일정(一定)한 경향이 없었다. 간단관수일수(間斷灌水日數)를 보면 모든 생육(生育) 및 수량상황(收量狀況)에서 간단관수일수(間斷灌水日數)가 길수록 현저히 감소(減少)되는 경향이었다. 그리고 정조중(正租重)에 대한 통계분석(統計分析) 한 것을 보면 단수시기(斷水時期) 간단관수일수(間斷灌水日數) 및 이들의 교호작용(交互作用) 1%이상(以上)의 고도(高度)의 유의성(有意性)이 있었다.