• Title/Summary/Keyword: grassland

Search Result 2,593, Processing Time 0.021 seconds

Cellular Slime Molds in the Littoral Grassland Ecosystems in the Lake Paldangho (팔당호 연안대 초지생태계의 세포성 점균)

  • 심규철;장남기
    • Asian Journal of Turfgrass Science
    • /
    • v.11 no.2
    • /
    • pp.125-137
    • /
    • 1997
  • Five dictyostelid cellular slime molds were isolated from the littoral grassland ecoystems of the lake Paldangho, safeguard of waterworks, Kyounggi-do, South Korea. They were Poiysphoadylium violceum, Dictyosielium aureo-stipes var. aureo-stipes D crassicaule, D macrocephalum and D gigauteum. P. violaceum was dominant species. It live on the low nutrient and barren soils as the littoral zone destabilized in surface soils, litters and chemicals by inundation an rain precipitation. Key words: Cellular slime mold, Littoral grassland ecosystem.

  • PDF

The Balance of the Storage and Decay of DNA by Producers and Decomposers in the Ecosystem of a Zoysia japonica Grassland (잔디초지 생태계에 있어서 생산자와 소비자에 의한 DNA의 축적과 분해의 평형)

  • 장남기;김정석;이병설;강경미
    • Asian Journal of Turfgrass Science
    • /
    • v.10 no.4
    • /
    • pp.275-283
    • /
    • 1996
  • An investigation was performed to reveal the relation between the storage and decomposition of the titter DNA of a Zoysia japonica grassland on Mt. Kwanak. The loss constant k of litters was 0.167. The times required for the decomposition of half, 95% and 99% of accumulated DNA on the grassland floor were 3.8, 16.6 and 27.6, respectively. The amount of DNA which is turned to living organism in the ecosystem is higher than that of crude protein. In the case of crude protein, the decay constant k was 0.181. The times needed for the decomposition of half, 95% and 99% of accumulated crude protein on the Z. japonica grassland floor were 3.8, 16.6 and 27.6 years, respectively. Key words: Zoysia japonica, Mt. Kwanak, Litter DNA, Crude protein, Decomposition, Accumulation.

  • PDF

Examination of gastrointestinal helminth in livestock grazing in grassland of Bangladesh

  • Mondal, M.-Motahar-Hussain;Islam, M-Khyrul;Hur, Jin;Lee, John-Hwa;Baek, Byeong-Kirl
    • Parasites, Hosts and Diseases
    • /
    • v.38 no.3
    • /
    • pp.187-190
    • /
    • 2000
  • To determine association of grassland with parasitic diseases of livestock in Bangladesh, the 'Tracer' animals (two cow calves and two goats) were released for a month in a grassland used for communal grazing of livestock near school premise in Kanthal, Trishal, Mymensingh, Bangladesh. After slaughtering of the tracer animals, their gastrointestinal tract examination revealed six species of nematode and one cestode. The nematode species were Haemonchus contortus, Trichostrongylus axei, Mecistocirrus digitatus, Oesophagostomum spp., Trichuris spp. and Bunostomum sp. The cestode was one of the genus Moniezia. With this preliminary study, grasslands are thought to be one of the main sources of gastrointestinal parasitic diseases of livestock in Bangladesh.

  • PDF

Effects of Winter Fire on Arthropoda Communities of Rice Fields (잔디 초지의 쥐불이 인접한 논의 절지동물군집의 동태에 미치는 영향)

  • 이학섭;장남기
    • Asian Journal of Turfgrass Science
    • /
    • v.4 no.2
    • /
    • pp.101-118
    • /
    • 1990
  • Effects of Zoysia japonica fired in winter on the arthropoda communities in its grassland and rice field was investigated . The results gave indicated that a significant difference between total 15,120 individuals of 4 classes, 11 orders, 47 families, 92 genera and 103 species in the control of Zoysia japonica grassland, and total 1, 404 individuals of 4 classes, 11 orders, 47 families, 53 genera 65 species in the Zoysia japonica grassland fired in winter. Index of similarity of Zoysia japonica grasslands between Kimpo and Yangsuri areas was 0.51. Dominant species of arthropoda communities in Zysia japonica grasstands in Kimpo and Yangsuri areas were Hypogastnua sp. and Proisotorn sp., respectively. The spiders were 9 families and 27 species at Kimpo, and t2 families. and 44 species at Yangsuri, and their dominant species was Gnathonariurn dentaturn at two areas. Laodelphex striatelus in the Zoysia japonica grassland fired in winter was sampled constantly morning, noon and night, hut Gnatlzonariun dentatum was sampled more frequently in the morning than at night. Damage of the spiders in the Zoysia japonica granssland fired in winter was more severe than that of Laodelphcx striatelus .

  • PDF

Effect of Goat Grazing on Surface Water Quality of Alpine Grassland

  • Khan, Ali Sultan;Kim, Jeong-Tae;Kim, Dong-Woo;Park, Ha-Young;Kwon, Chan-Ho
    • Journal of The Korean Society of Grassland and Forage Science
    • /
    • v.38 no.4
    • /
    • pp.349-356
    • /
    • 2018
  • The objective of this study was to determine the effect of goat grazing on the surface water quality of the alpine grasslands. Seven sites were selected across the goat farm for water sample collection and analysis. Samples were analyzed for BOD (Biological oxygen demand), total nitrogen, total phosphorous, electrical conductivity and water turbidity. All the above-mentioned parameters remained below the standard limit of Korean government at the end site. Puddles showed higher values, but below standard, as stagnant water has lower physico-chemical properties as of flowing water. The present study clearly showed that goat grazing doesn't affect water quality in grasslands if grazing is according to carrying capacity of grassland and fertilizer application is judicious.