• 한국환경복원기술학회지
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• 제12권3호
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• pp.33-48
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• 2009

A palustrine wetland is a type of a wetland that prevails in Korea as well as an ecosystem that provides various ecological functions and has affluent biodiversity. This study was conducted to understand the characteristics of vegetation in a palustrine wetland by analyzing a life form and naturalized plants, in order to present the maintenance and utilization plan of a small wetland. A total of 249 taxa including 76 families, 188 generics, 209 species, 38 varieties and 2 forma were found at six investigated wetlands. As a result of the appearance ratio analysis, Therophytes (37.8%) with 94 taxa and Hemicryptophytes (31.3%) with 78 taxa were in order of life form, and Gramineae (14.1 %) with 35 taxa and Compositae (11.2 %) with 28 taxa were in order of family level. These were deemed representative vegetation in a palustrine wetland. Equosetum arvense, Phragmites communis, Commelina communis, Persicaria thunbergii, Arenaria serpyllifolia, Stellaria media, Erigeron annuus, Erigeron canadensis and Artemisia princeps var, orientalis were found continuously for a period of investigation in all sites. Equosetum arvense, Phragmites communis and Persicaria thunbergii were species with high appearance frequency. Especially, Persicaria thunbergii was construed high in a cover ratio in May as it develop first among Hydrophytes and form a canopy sooner than anything else. We found that a degree of naturalization and an urbanization index appear comparatively high in Yeongok-ri, Cheonan, Gangjang-ri, Asan and Yodang-ri, Hwasung, which is construed due to artificial interference, such as fanning, fishing, swimming and green-tour program. These results would be used to utilize in restoring a deserted and damaged wetland and to provide fundamental data in creating a wetland as follows.

• Asian-Australasian Journal of Animal Sciences
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• 제32권2호
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• pp.209-216
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• 2019

Objective: We compare the effects of three different approved sources of supplemental zilpaterol on growth-performance responses and carcass characteristics of finishing lambs. Methods: Twenty four Pelibuey${\times}$Katahdin lambs ($46.75{\pm}2.43kg$) were used in a 33-day feeding trial. Lambs were fed a dry rolled corn-based finishing diet. Treatments consisted of the non-supplemental basal diet (Control) versus the basal diet supplemented with 125 mg zilpaterol/kg of diet (as fed basis) from three commercial sources marketed in Mexico: Zilmax (ZIL), Grofactor, and Zipamix. Results: Compared to controls, zilpaterol (ZH) supplementation did not affect dry matter intake (DMI), but increased carcass adjusted daily weight gain (ADG, 36.7%), gain efficiency (34.2%), and dietary net energy (26.0%), and decreased (23.4%) the ratio of observed:expected DMI. Compared to controls, supplemental ZH increased hot carcass weight (6.4%), dressing percentage (3.2%), m. longissimus thoracis (LM) area (15.6%), and shoulder muscle:fat ratio (28.7%), but decreased kidney-pelvic-heart fat, and fat thickness. Supplemental ZH increased 10.9% and 14.3% whole cut weight of loin and leg, respectively, and the proportion (as percentage of cold carcass weight) of leg (4.3%). These increases were reflected in greater forequarter and hindquarter weights. Lambs fed ZH increased (4.6%) empty body weight (EBW) and reduced (14.7%) liver/spleen weight (as g/kg EBW). Likewise, ZH supplementation tended (p = 0.08) to lower (8.9%) visceral fat. Growth performance, energetic efficiency, hot carcass weight, dressing percentage, LM area and whole cuts were not different across supplemental ZH sources. However, compared with non-supplemented controls, only ZIL appreciably decreased carcass fat distribution, including fat thickness, percentage kidney pelvic and heart fat, shoulder fat, and visceral fat. Conclusion: Supplemental ZH increases ADG, gain efficiency, carcass dressing percentage, and LM area. The magnitude of these responses was similar among ZH sources. Nevertheless, compared with non-supplemented controls, only ZIL appreciably decreases carcass fat. The basis for this is uncertain, but indicative that some practical differences in zilpaterol bio-equivalency may exist across commercial sources tested.

• 한국습지학회지
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• 제14권1호
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• pp.59-73
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• 2012

2010년 제10차 람사르 총회를 시작으로 논습지의 중요성이 대두되고 있다. 그러나 현재 논습지를 평가할 수 있는 연구체계가 부족하며, 유기농업이 식생특성에 미치는 영향에 대한 연구도 부족한 실정이다. 따라서 본 연구는 유기논의 식생특성을 알아봄과 동시에 논습지 가치를 평가를 위한 기초자료로 활용하고자 연구를 진행하였다. 연구 대상지는 유기논과 관행논 총 6곳을 선정하였다. 기존의 습지평가 체계인 수정 RAM의 평가 중 '식생다양성 및 야생동물서식처' 기능을 분석하였다. 분석결과에 영향을 미치는 인자는 단순한 토지이용의 결과만이 평가를 좌우하는 것으로 나타났다. 식생조사 결과 총 53과 146속 148종 26변종 1품종으로 총 176종류가 조사되었다. 유기논 지역과 관행논 지역의 생활형 출현비율 차이를 살펴보면 유기논이 일년생식물과 대형지상식물의 생활형 출현비율이 높은 것을 확인할 수 있다. 귀화식물의 분포 또한 관행논 지역보다 유기논의 귀화율 및 도시화지수가 낮음을 확인 할 수 있다. 연구대상지의 생육환경과 식생특성간의 Pearson 상관분석 결과 논습지 식생다양성의 경우 토지이용에는 크게 영향을 받지 않는 것으로 분석되었다. 하지만, 유기논이 관행논에 비해 식생이 다양함을 보여주며, 사초과의 종류와는 1%이내의 상관관계가 인정되어 추후 논습지 평가 시 사초과의 종류수를 활용할 수 있을 것으로 판단되었다. 습지평가는 식생특성 뿐만 아니라 토양환경, 수질환경, 주변의 자연경관, 인공경관 등 다양한 인자들이 영향을 미치는 것으로 판단된다. 따라서 추후 이에 대한 정밀한 조사와 연구대상지 확대를 통해 추가 연구가 필요 할 것으로 판단된다.