• Journal of The Korean Society of Grassland and Forage Science
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• v.17 no.3
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• pp.257-264
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• 1997

This study was conducted to assess present situiatioq of oversowing grassland yield and vegetational succession of abondoned since 6 years passed grassland in Wonju. The highest annual h s h weight yield was 28ton/ ha and the lowest was I lton/ha and the grass rate of investigated oversowing grasslands were range from 19.5% to 9lS%. The soil properties of abandoned oversowing grassland, such as soil pH content of organic matter, available phosphorus, exchangeable potasium, calcium, and magnesium were 5.7, 3.88%, 3lppm, O.lme1100g 4.9meI 100g and 2.3me/100g, respectively. The floristic composition of abandoned grassland were composed 26 species of vascular plants. The dominant species based on SDR, of grassland were Miscanthus sinensis var. purpurascens(56.32%). Artemisia feddei(48.62%) and Dactylis glomerata(43.85%). The biological spectra showed the H-$D_1$-$R_5$-e type.

• Journal of Plant Biology
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• v.9 no.3_4
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• pp.7-13
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• 1966

The investigation on the grassland type was conducted by the data in the previous these (Park 1963, '64, '65, '66). The results obtained are as follows; 1) I defined that the relationship between the valves of DS and the main species of the grass in Korea(Table Ⅰ) Grassland Stage ; Waste type………6 community-types Short grass type………3 community-types Pteridium type………1 community-types Tall grass type………4 community-types Sasamorpha type………1 community-types Shrubby Stage; Lespedeza type Pioneer tree type………6 species Forest Stage; Deciduous broad leave tree type………6 species Evergreen broad leaved tree type………3 species Evergreen needle leaved tree type………7 species 2) I defined; that the relationship between the valves of DS and the grassland type in Korea(Table 2). Of grassnland type, the range of valves of DS, 50-220 belongs to waste type; 130-310 short grass type; 230-640 tall grass type; 210-450 pteridium type; 510-970 sasamorpha type; 730-1450 shrubby type; 3) I decided; The succession stage centering on the Sasamorpha purpuracens in Korea(Table 3). 4) I decided the climate type and the grassland succession in Korea(Table 4).

• Korean Journal of Environmental Biology
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• v.22 no.3
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• pp.381-386
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• 2004

To develop accurate and predictive global carbon cycle models, it is important to understand the change of accumulated carbon for many ecosystems according to successional stage. In this study, I measured total biomass, litter and soil organic matter contents through an aerial photo and field observation. As a result, accumulated organic matter contents per unit area (kg $m^{-2})$ of three communities composed at grassland were 7.00 kg $m^{-2}$, in Solidago altissima community, 9.18 kg $m^{-2}$, in Imperata cylindrica community, and 12.68 kg $m^{-2}$, in Miscanthus sinensis community, respectively. Accumulated total organic matter contents was high in Miscanthus sinensis community at later succession stage but soil carbon was low. In Miscanthus sinensis community, highly accumulated organic matter contents was resulted from increasing of biomass comparison with that of the other two communities. The pattern of accumulated organic matter contents was changed by changing of the dominant community due to progressing in succession. The accumulated carbon in temperate grassland will be increased with progressing in succession.

• Journal of Ecology and Environment
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• v.36 no.1
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• pp.101-112
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• 2013

To quantitatively analyze the effects of burning, we conducted a vegetation survey in the grasslands in Kirigamine, central Japan. We classified each species into stages of succession based on the life-history traits of the species and defined the score of the species in each stand based on the classification. We weighted the scores with a v-value, the product of coverage and height in the quadrat, and summed them to calculate the index of dynamic status. With these indices, we were able to quantitatively compare the stands in the study area and discern minute differences between the stands with different lengths of restoration periods since the disturbance of burning. These indices correlated with the v-value of trees, suggesting that the disturbance of burning seemed to affect the trees in the stand. We then calculated the growth of the tree species Pinus densiflora to evaluate its contribution to the index of dynamic status.

• Journal of Ecology and Environment
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• v.32 no.1
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• pp.55-60
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• 2009

We analyzed the factors driving succession and the structure, and dynamics of vegetation on sand and gravel bars in order to clarify the differences in vegetation succession in rivers with different river bed substrates. Woody plant communities (dominated by Salix), perennial herb communities (dominated by Miscanthus), and annual plant communities (dominated by Persicaria) appeared in that order from upstream to downstream on the sandbar. The results of DCA ordination based on vegetation data reflected a successional trend. This result suggests that sandbars grow in a downstream direction. Various vegetation types different in successional stage, such as grassland, young stands of Korean red pine (Pinus densiflora), two-layered stands of young and mature pines, and mature pine stands also occurred on gravel bars, but the vegetation in earlier successional stage was established upstream, which is the opposite to the direction found on sandbars. Those results demonstrate that the dynamics of the bed load itself could be a factor affecting vegetation succession in rivers. In fact, sands suspended by running water were transported downstream over the vegetated area of sand bar and thereby created new areas of sandbar on the downstream end of the sandbar. Meanwhile, gravel, which is heavy and thereby is shifted by strong water currents, accumulated on the upstream end of the vegetated area, and thus created new areas of gravel bar in that direction. These results showed that allogenic processes drive vegetation succession on sand and gravel bars in streams and rivers.

• Journal of The Korean Society of Grassland and Forage Science
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• v.12 no.3
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• pp.145-152
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• 1992

Phosphorus(P) cycle of Miscanthus sinensis, Sasa palmata and Artemicia princeps for perennial plants and Polygonwn thunbergii for annual plant were investigated in natural plant communities established in Andosol region. 1. Perennial plants contained about 50-80 % P of the maximum accumulated in whole plant in under ground parts as reserve P before wintering. On the other hand, annual plant returned the most part of P in plant tissues to soil and wintered with a small amount of P in only seed. 2. The storage percentage of K was low compared to P in both perennial and annual plants. And the return of K from litter to soil proceeded rapidly because of easy leaching of K. 3. Perennial plants stored a large amount of P in reserve organs before wintering and carry it over next generation, and P holded in an individual showed a yearly increase. Consequently, P was less susceptible to depressive factor for growth of perennial plants even in poor P circumstances like Andosol region, compared to annual plant.

• Journal of The Korean Society of Grassland and Forage Science
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• v.13 no.1
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• pp.23-30
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• 1993

This study was investigated about decomposition process of litter that is reduction pathway of phosphorus from plant body to soil That is, in each community of Miscanthus sinensis, SaSa palmalta. Artemisia princeps and Polygonum thunbergii, disappearing speed was calculated from total fallen leaves yield supplied as litter and litter existant yield. Besides, setting up litter bag that put litter in nylon mesh bag. calculated disappearing speed from decreasing speed of the weight of contents and then was compared and examined. The results obtained are summarized as follows : 1. Maximum litter yield was sequently Miscanthus sinensis＞SaSa palmalta＞Artemisia princeps＞Polygonum thunbergii, but, supplied litter yield was sequently Artemisia princeps＞Miscanthus sinenis＞Polygonum thunbergii＞SaSa palmalta. 2. Reduction speed of phosphorus from plant body to soil was Polygonum thunbergii＞Artemisia princeps＞Miscanthus sinensis＞SaSa palmalta. 3. Caculated disappearing speed using litter bag method was shown latter tendency than that of natural condition. 4. It was significantly negative relationship between N contents of litter and disappearing speed of litter.

• Korean Journal of Environment and Ecology
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• v.23 no.4
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• pp.317-325
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• 2009

This study was presented to effect of prescribed burning to the avian fauna and was conducted from March to October 2007 in Sihwa grassland, Gyeonggi-do, Korea. Prescribed burning was conducted at Sihwa grassland of Songjeong-ri Mado-myeon, Hwaseong city from 28th February to 1 st March 2007. Thirty birds species were observed and sum of the maximum count was 181 individuals at the prescribed burning area for all survey time. Observed species was 24 species and sum of the maximum count was 154 individuals on the unburned area. Number of species and sum of the maximum count at the prescribed burning area was greater than unburned area. There is no differences in the dominant species between prescribed and unburned area. Average number of species, number of individuals, species diversity and species richness of the prescribed burning area were greater than unburned area in early stage (from March to June) after prescribed burning. Community indices in burned area during early season were different with unburned area by prediscribed burning. However, the indices had became similar between burned and unburned area as time goes by. Disturbance by prescribed burning created new habitat and feeding site temporarily for the avian species in grassland. We would suggest that prescribed burning is most effective method to maintain grassland ecosystem from the invading bush or tree and periodical prescribed burning is a good method to preserve and manage the grassland ecosystem.

• Journal of The Korean Society of Grassland and Forage Science
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• v.18 no.4
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• pp.337-344
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• 1998

This study was conducted to find out the vegetational succession in abandoned hilly pasture, in Yeoju, Kyonggi Province from April, 1993 to October, 1996. The experiment was arranged as vegetation survey (Pflanzenaufuahme) with two different pastures((1) with forkcrane planed pasture and (2) forest pasture). After the abandoned management of pasture, the botanical composition of planed pasture and forest pasture was greatly changed into the type of natural vegetation in the first year and in the second years, respectively. The biomass of life forms of hemicryptophytes, geophytes and chamaephytes was greatly decreased, on the other hand, that of therophytes and nanophanerophytes after abandoned management of planed and forest pasture in three years was slightly increased than those of the vegetation with pasture management. The similarity coefficients among vegetation groups during the survey were greatly affected by botanical composition. The clustering analysis was showed that the communities of relatively similar botanical composition were grouped closely, and the other communities were clustered farther to the same group although the degree of similarity between communities was low. The communities of hilly pasture after abandoned management were gradually successive into the type of natural grassland or forest community in three years.

• Journal of The Korean Society of Grassland and Forage Science
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• v.6 no.2
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• pp.91-96
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• 1986

This trial was carried out to find out the degree of fodder value of different plant communities and to make the plant sociological vegetation map for all plant communities at the natural grassland of the Rehberg-Alm in the Bavarian Alps, southern part of Germany during 1982-1983. 1. Allogenic succession of the plant communities at natural grassland was much more influenced by the change of soil moisture or/and surface water than sheep grazing. 2. The plant communities at the Rehberg-Alm were Nardetum alpigenum, Poo-Prunelletum, Cirsium arvense Cirsium Vulgare-Association, Caricetum davallianae, Rumicetum alphini, Caricetum paniculatae and Disturbed lowland bog-Stand. 3. By the sheep grazing will be improved the inferior plant community of Nardetum alpigenum to the most desirable Poo-Prunelletum plant community at the mountainous grassland gradually. 4. General fodder value in this area depended heavily on the composition of vegetation of the plant communities. The highest fodder value was the Poo-Prunelletum with 4.4 and the next was the Nardetum alpigenum with 2.5. The others were not suitable for grazing pasture due to less fodder value.