• 제목/요약/키워드: Natural grass

검색결과 198건 처리시간 0.029초

Cutting Frequency Effects on Forage Yield and Stand Persistence of Orchardgrass and Alfalfa-Orchardgrass Fertilized with Dairy Slurry

  • Min, D.H.;Vough, L.R.
    • Asian-Australasian Journal of Animal Sciences
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    • 제13권5호
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    • pp.630-635
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    • 2000
  • Previous research has not evaluated the effects of various rates and frequencies of manure application and frequencies of cutting on yield and stand persistence of cool-season grasses and alfalfa-grass mixtures. The primary objective of this study was to compare the effects of cutting management systems on herbage yield and stand persistence of orchardgrass (Dactylis glomerata L.) and an alfalfa (Medicago sativa L.)-orchardgrass mixture from various rates and frequencies of dairy slurry application. A randomized complete block design with treatments in a sub-subplot arrangement with four replicates was used. The main plot consisted of 2 cutting management systems (4 and 5 annual cuttings). The subplots were 9 fertility treatments: 7 slurry rate and frequency of application treatments, one inorganic fertilizer treatment, and an unfertilized control. The split-split-plots were the two forage species: orchardgrass and alfalfa-orchardgrass mixture. The study was initiated after 1st cutting in 1995. Cumulative yields of the 2nd and subsequent cuttings of both orchardgrass and alfalfa-orchardgrass in 1995 were higher for the 5-cutting system than the 4-cutting system. The 1995 growing season was abnormally dry. In 1996, an abnormally wet year, the reverse was true, total herbage yields being higher for the 4-cutting system than the 5-cutting system. Species response to fertility rate/frequency treatments was different in both years. Higher application rates early in the season and carryover of nutrients from late season applications the previous year appear to be responsible for the yield increases of those fertility treatments having significant yield differences between the cutting management systems. The stand ratings of orchardgrass were not affected by cutting management. In the spring of 1997, however, the stand ratings of alfalfa-orchardgrass in the 4-cutting management system were significantly greater than the 5-cutting management system. The very high manure application rate significantly reduced the stand ratings of alfalfa-orchardgrass in the 5-cutting system.

포장재료의 심리적 특성 분석 (Psychological Character Analysis of Pavement Materials)

  • 김대현
    • 한국조경학회지
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    • 제32권5호
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    • pp.43-51
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    • 2004
  • Recently, the importance of choosing correct pavement materials has been increasing in urban spaces and streets. Much research regarding the pavement theory and construction method have been conducted, but analysis in terms of human psychological character has not yet been performed. The purpose of this study is to investigate the psychological characters to 12 pavement materials, that are commonly used in our urban spaces and streets. The results of the psychological character for each pavement material can be summarized as follows: 1. The psychological characters to each pavement material were as follows: ① Clay embodies a natural, traditional, soft and intimate psychological character; ② Pebble stone has a natural, hard, cool and intimate psychological character; ③ Turf grass incorporates an intimate and soft psychological character; ④ Ceramic brick has an artificial and hard psychological character; ⑤ Tile pavement has a modern, artificial, hard and cool psychological character; ⑥ Water permeable concrete has a modern and artificial psychological character; ⑦ Flag stone has a natural psychological character; ⑧ Granite has a modern and artificial psychological character; ⑨ Portland concrete has an artificial and hard psychological character; ⑩ Small compacted brick has an artificial, dynamic and modern psychological character; ⑪ Wood block pavement has a natural and traditional psychological character; ⑫ Asphalt concrete pavement has a modern, hard and artificial character. 2. On the results of the cluster analysis regarding psychological indexes for 12 pavement materials, pavement materials were categorized in 3 clusters. Among them, one cluster was mainly used as the most popular pavement material in our urban spaces and streets. From this point of view, psychological character for pavement material in our urban spaces and streets was not as various as we expected. 3. In conclusion, the proper selection of pavement materials was very important and the factors affecting the human psychological character should be considered in the design of urban spaces and streets.

A new record of Antennoseius avius (Karg, 1976) (Acari: Mesostigmata; Ascidae) from Korea

  • Keum, Eunsun;Kaczmarek, Sławomir;Jung, Chuleui
    • Journal of Species Research
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    • 제5권3호
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    • pp.375-380
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    • 2016
  • Mites of the genus Antennoseius of family Ascidae are free-living soil predator mostly observed on the open grass field. In Korea, only two species, Antennoseius imbricatus Ishikawa, 1969 and A. japonicus Ishikawa, 1979 were reported in 1990s. Recent series of soil acarine biodiversity survey in Gyeongbuk province during 2009-2015. We recovered a new record of Antennoseius avius (Karg, 1976) to Korean inventory from riparian grassland. Detailed description of the species as well as the identification key to the genus and species were provided.

재생굵은골재를 사용한 다공성 폴리머 블록의 식생 특성 (Planting Properties of Porous Polymer Block Using Recycled Coarse Aggregates)

  • 성찬용;김영익
    • 농업과학연구
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    • 제37권1호
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    • pp.87-96
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    • 2010
  • This study was performed to evaluate the planting properties of herbaceous plant and cool-season grass in porous polymer blocks that were manufactured by using recycled coarse aggregates and unsaturated polyester resin to develop environmentally friendly planting blocks. Unsaturated polyester resin, natural and recycled coarse aggregates and $CaCO_3$ were used. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate sizes(5-10 and 5-20mm). Tests for the void ratio and compressive strength of porous polymer concrete were performed at curing age 7 days. Also, porous polymer block using recycled coarse aggregates were applied to kinds of plants such as tall fescue, Perennial ryegrass, Lesedeza and Alfalfa. After seed, initial germination, germination ratio, cover view and growth length for planting blocks were estimated by various methods.

스마트 TMD를 이용한 개폐식 대공간 구조물의 지진응답제어 (Seismic Response Control of Retractable-roof Spatial Structure Using Smart TMD)

  • 김현수;강주원
    • 한국공간구조학회논문집
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    • 제16권4호
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    • pp.91-100
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    • 2016
  • A retractable-roof spatial structure is frequently used for a stadium and sports hall. A retractable-roof spatial structure allows natural lighting, ventilation, optimal conditions for grass growth with opened roof. It can also protects users against various weather conditions and give optimal circumstances for different activities. Dynamic characteristics of a retractable-roof spatial structure is changed based on opened or closed roof condition. A tuned mass damper (TMD) is widely used to reduce seismic responses of a structure. When a TMD is properly tuned, its control performance is excellent. Opened or closed roof condition causes dynamic characteristics variation of a retractable-roof spatial structure resulting in off-tuning. This dynamic characteristics variation was investigated. Control performance of a passive TMD and a smart TMD were evaluated under off-tuning condition.

Evaluatinon of the Surface Water in Southwest Area of Vietnam

  • Thai, Thanh Luom
    • 환경영향평가
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    • 제18권6호
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    • pp.445-452
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    • 2009
  • This study surveys the surface water environment in Southwest sea areas of Vietnam in order to evaluate the current environment. It collects and analyzes experimental results of programs, scientific subjects, and international projects relevant to ecological areas and coastlines of Kien Giang province. The methods analyzed and discussed by specialists are evaluated according to pollution coefficients established by the World Health Organization (WHO), sampling methods, and case study analyses. Comparison between the scale of pollution levels and the surface water quality in experimental areas of Long Xuyen Quadrangle shows a light-moderate pollution level. In Ca Mau Peninsula, the surface water source is only slightly polluted. Sea areas and islands are also light-moderately polluted. Computing results from water quality indices (WQI) show the level of pollution in experimental sites. Activities such as constructing infrastructures for tourism, exploiting minerals, and increasing population accelerate environmental pollution by deteriorating inherently sensitive ecosystems like corals, sea grass, mangrove swamps, and Melaleuca forests. Surveying and evaluating the present situation of surface water are fundamental solutions for environmental protection in the Southwest sea areas of Vietnam.

A Neuro-Fuzzy Model Approach for the Land Cover Classification

  • Han, Jong-Gyu;Chi, Kwang-Hoon;Suh, Jae-Young
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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    • pp.122-127
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    • 1998
  • This paper presents the neuro-fuzzy classifier derived from the generic model of a 3-layer fuzzy perceptron and developed the classification software based on the neuro-fuzzl model. Also, a comparison of the neuro-fuzzy and maximum-likelihood classifiers is presented in this paper. The Airborne Multispectral Scanner(AMS) imagery of Tae-Duk Science Complex Town were used for this comparison. The neuro-fuzzy classifier was more considerably accurate in the mixed composition area like "bare soil" , "dried grass" and "coniferous tree", however, the "cement road" and "asphalt road" classified more correctly with the maximum-likelihood classifier than the neuro-fuzzy classifier. Thus, the neuro-fuzzy model can be used to classify the mixed composition area like the natural environment of korea peninsula. From this research we conclude that the neuro-fuzzy classifier was superior in suppression of mixed pixel classification errors, and more robust to training site heterogeneity and the use of class labels for land use that are mixtures of land cover signatures.

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자연장의 유형별 시각적 이미지 분석 (Visual Image Analysis on the Types of Natural Funeral)

  • 김철재;이시영
    • 한국조경학회지
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    • 제42권1호
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    • pp.75-88
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    • 2014
  • 본 연구는 자연장의 유형 분류를 통해 유형별 시각적 이미지를 분석하고, 그 선호 이미지에 대한 영향을 밝히고자 하는데 연구의 목적이 있다. 본 연구를 위하여 시민 549명을 대상으로 조사하였으며, 이중에 장례전문가 224명이 포함돼 있다. 서울, 대전, 전주, 부산지역에 거주하는 일반인이 주로 설문에 응답하였다. 실증적 분석을 위하여 자연장지의 시설을 장지시설과 추모시설로 나누었으며, 각각의 시설을 5개의 유형으로 구분하였다. 이들 중 장지시설을 수목형, 정원형, 화초형, 잔디형, 산골형으로 분류하였다. 실증분석 결과, 첫째, 장지시설에서는 물리적 요인, 외형적 요인, 균형적 요인이 도출되었다. 둘째, 가장 선호하는 장지시설 유형은 수목형으로 나왔고, 그 다음으로 화초형, 정원형, 잔디형, 산골형의 순서로 나왔다. 셋째, 각 유형별을 비교하기 위하여 각 이미지 요인의 평균값을 기본으로 지각도로 그려 제시하였다. 넷째, 자연장의 일반적 특성별 이미지 요인에서 유의적인 차이가 있는지 검증을 한 결과, 장지시설의 경우 전체적으로 물리적 요인에서는 성별, 연령별, 학력별, 유형별, 외형적 요인에서는 성별, 종교별, 집단별, 유형별, 균형적 요인에서는 성별, 학력별, 유형별로 유의적인 차이가 있었다. 성별로 보면 남성이 여성보다 각 요인에서 평가가 높게 나왔고, 연령별로 보면 물리적 요인에서 전반적으로 나이가 많을수록 평가가 높아지는 경향에 대한 유의적인 차이가 있었다. 다섯째, 각 시설에서 도출된 이미지 요인이 해당시설의 선호도에 미치는 영향을 분석하기 위하여 회귀분석을 실시한 결과, 장지시설에서는 5가지 유형 모두 물리적 요인, 외형적 요인, 균형적 요인이 시설 선호도에 정(+)의 유의적인 영향력이 있는 것으로 나왔다. 마지막으로 조경시설의 이미지 요인이 그 선호도에 미치는 영향에서 일반인과 전문가 집단 사이에 그 차이가 있는지 집단의 조절효과를 검증하였다. 검증 결과, 장지시설의 경우, 정원형에서 외형적 요인에서 유의적인 정(+)의 조절효과가 있었고, 기타 이미지 요인에서는 유의적인 조절효과를 찾을 수가 없었다. 또한 본 연구는 자연장지의 장지시설의 형태별 유형을 분류함으로써 아직 태동기에 있는 자연장이 아직은 학술적으로 정립되지 않은 상태에서 나타날 수 있는 제반 문제점을 해결하고, 우리나라 실정에 맞게 발전시키는 방안을 제시하였다. 다른 한 편으로 자연장지 표준 경관 이미지 분석에 대한 조사를 통해, 전통적 장사 이념을 지켜 나가며 새로운 미적 욕구를 충족시키는 방향으로 장사문화를 발전시켜 나감으로서 국민들이 자연장을 선택할 수 있는 합리적 방향을 제시했다는 데서 의미를 찾을 수 있다.

The Nutritive Value of Mulberry Leaves (Morus alba) and Partial Replacement of Cotton Seed in Rations on the Performance of Growing Vietnamese Cattle

  • Vu, Chi Cuong;Verstegen, M.W.A.;Hendriks, W.H.;Pham, K.C.
    • Asian-Australasian Journal of Animal Sciences
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    • 제24권9호
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    • pp.1233-1242
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    • 2011
  • The in vivo digestibility of mulberry leaves (Morus alba) and the effects of the partial replacement of cotton seed with fresh mulberry leaf in rations on the performance of growing Vietnamese cattle was investigated. For the in vivo digestibility trial, twenty castrated rams of Phanrang breed (a local prolific breed) with an initial weight of 23-25 kg, were first assigned to four groups according to weight and then randomly assigned to one of four dietary treatments to determine digestibility of nutrients in mulberry leaves (M. alba), natural Bermuda grass (Cynodon dactylon), elephant grass (Pennisetum purpureum) and buffalo grass (Panicum maximum cv. TD 58). All forages were cut and chopped daily before being offered (at 120% maintenance) to the sheep. In the feeding trial, 20 Laisind (Vietnam yellow cows${\times}$Red Sindhy bulls) crossbred bulls averaged 18 month old and 184 kg were used to investigate the effect of partial replacement of cottonseed in the diet by mulberry leaves on live weight gain and feed conversion rate. The experiment was a randomized complete block design with four levels of fresh mulberry leaves which varied from 0 to 15% of total dietary dry mater and five animals per treatment over an 84 day period. The in vivo digestion trial showed the superior quality of mulberry leaves compared with the grasses. Chemical analysis indicated that mulberry leaves had the highest CP and the lowest NDF contents (22.3 and 31.1% DM, respectively) among the four forages tested. Digestibility of DM and OM of the mulberry leaf (66.4 and 71.8%, respectively) was also the highest but that of CP (58.2%) and NDF (58.4%) was the lowest of the four forages evaluated (p<0.05). Consequently, the ME value and therefore net energy (NE) and unit feed for lactation (UFL) values of the mulberry leaves, which was estimated from chemical composition and digestibility values, were the highest among the forages investigated in the present study. Results of the feeding trial showed no treatment effect on average daily gain (ADG) of the cattle. The values were 554, 583, 565 and 568 g/d for animals in the diets of 0, 5, 10, and 15% mulberry leaves inclusion, respectively. Total DM intake of the animal was not affected by the treatment when expressed as kg/animal/d. However, when adjusted for metabolic weight of the animal the DM intake was reduced (p<0.05) as whole cottonseed was replaced by mulberry leaves in the ration. When the level of mulberry leaves in the ration increased from 5 to 15% of dietary DM at the expense of whole cottonseed, CP and ME intakes of the cattle were significantly decreased (p<0.05) and the feed to gain ratio reduced by 8 to 14% as compared with the control diet (p<0.05). Mulberry leaf is a good feed ingredient for ruminants because of its high level of crude protein and high digestibility of nutrients and energy. Mulberry leaves can be efficiently used as a source of protein supplement to replace cottonseed, a more expensive animal feeds ingredient, in the diet for Vietnamese cattle.

객체기반 셀룰러오토마타 모형을 이용한 하남시 토지이용변화 모의 (Simulation of land use changes in Hanam city using an object-based cellular automata model)

  • 김일권;권혁수
    • 한국지리정보학회지
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    • 제21권4호
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    • pp.202-217
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    • 2018
  • 인간 활동에 의한 도시의 토지이용변화는 도시의 공간구조와 생태계에 영향을 미친다. 토지이용변화 패턴을 파악하고 미래의 토지이용변화를 모의하는 것은 지속가능한 도시 관리를 위해 필요하지만, 토지이용변화의 불확실성과 복잡성으로 인해서 이를 효과적으로 모의하기 어렵다. 셀룰러오토마타 모형은 도시토지이용변화에 널리 사용되는 모형으로, 격자기반의 변화를 모의한다. 하지만, 격자기반의 모의는 실제 토지이용변화 특성을 반영하기 어렵고, 토지이용의 파편화가 나타나는 한계가 있다. 이러한 문제를 보완하기 위해 제작된 객체기반 셀룰러오토마타모형은 토지패치 객체별 변화를 모의한다. 본 연구는 하남시를 대상으로 객체기반 토지이용변화 모형을 제작하여 미래의 토지이용변화를 모의하였다. 제작된 모형의 정확도를 평가하는 성능지수는 24.1%로 평가되었다. 기준시나리오를 적용한 2038년의 토지이용변화 모의결과, 시가지는 16.4% 감소한 반면, 농경지는 9.0% 증가하였고, 초지는 19.3% 증가하였다. 개발시나리오의 경우 시가지는 22.4% 증가하였고, 농경지는 26.1% 감소한 반면, 산림과 초지는 큰 변화가 나타나지 않았다. 보전시나리오의 경우 시가지는 29.5%, 농경지는 8.8%감소하였고, 산림과 초지는 각각 6%, 42.8% 증가하였다. 본 모형은 실제 도시 토지이용변화를 효과적으로 모의하여 공간계획을 위한 의사결정지원도구로 사용될 수 있다.