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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Agricultural and Forest Meteorology
Journal Basic Information
Journal DOI :
Korean Society of Agricultural and Forest Meteorology
Editor in Chief :
Volume & Issues
Volume 5, Issue 4 - Dec 2003
Volume 5, Issue 3 - Sep 2003
Volume 5, Issue 2 - Jun 2003
Volume 5, Issue 1 - Mar 2003
Selecting the target year
Analysis of Forest Fire Spread Rate and Fire Intensity by a Wind Model
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 213~217
Forest fire spread and intensity were modeled as a function of wind and fuel. Spread rate and intensity of forest fire were related to weight and thickness of forest fuel beds and to wind speed. Forest fire spread rate and fire intensity were differentiated according to wind speed. Rapid wind speed causes a faster forest fire spread rate and greater fire intensity than does slow wind speed. Relative burning time of the fire from beginning to end in the model was 161 sec at a wind speed of 0.5 m/sec and 146 sec at 1m/sec on the model. Average forest lire spread rate was 0.014 m/sec at a wind speed of 0.5 m/sec and 0.020 m/sec at 1m/sec. Average fire intensity was 0.183 ㎾/m at a wind speed of 0.5 m/sec, 0.259 ㎾/m at 1m/sec. Fire intensity was greater when forest fire spread rate was rapid.
Fruit Quality of 'Tsugaru' Apples Influenced by Meteorological Elements
Hyeong-Ho Seo ; Hee-Seung Park ;
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 218~225
An analytical study was conducted in 2002 to observe the relationship between meteorological elements and the fruit quality of 'Tsugaru' apples at 8 orchards. The higher average air temperature in August made a higher content of soluble solids, but showed a lower anthocyanin content. As the average air temperature from April through August increased, flesh firmness decreased; and as the maximum air temperature from April through August increased, Hunter a value also decreased. Additionally, it was observed that the cytohistological characteristics of 'Tsugaru' apples were correlated with the average air temperature during the growing season. As average air temperature during the growing season increased, the epidermal layer of the fruit skin became thinner, starch density in the flesh decreased, intercellular space was larger, and tissue structure became looser.
Genetic Changes of Cornus controversa with Ozone Exposure
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 226~232
To examine the effects of ozone (O
), one of the major air pollutants in the city area, on genetic changes in Cornus controversa Hemsl., we compared genetic structures between sensitive (S) and tolerant (T) tree groups of C. controversa fumigated with ozone using isozyme markers. The genetic structures were measured in terms of allele and genotype frequencies determined at ave polymorphic enzyme loci. Marked genetic differences between the two groups were detected at three loci (Lap-2, Mdh-1 and Skdh-1). Genetic parameters, genetic multiplicity, genetic diversity and heterozygosity showed that the tolerant group retained greater genetic variation than did the sensitive group. Results of the study were congruent with the general expectation that the more heterozygous individuals and/or populations exhibit higher resistance to various stress factors.
Growth Properties and Characteristics of Water Relation Parameters for a Forest of Quercus variabilis by Enviromental Factors
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 233~237
This study was conducted to provide a rational forest management method for a natural oak (Quercus variavilis) forest stand in the central part of South Korea based on characteristics of growth and water relation parameters. Average volume per hectare was 175.1 ㎥ in the study site of oak stands. Basal area and volume of each direction appeared to increase as the slope direction moves from north to south, but annual mean increment and periodic annual increment of DBH for 10 years showed the lowest value at the southern aspect. Maximum water potentials measured between 12 and 14 o'clock were analyzed by direction and elevation in the oak stands. Water potential of oak decreased as the slope changed from the north to the south aspect and water potential increased at lower elevations. Soil water content for the oak stands tended to decrease as the aspect shifted from north to south. Water potential and soil moisture content were highly correlated. It appears that oaks have a higher moisture requirement at the southern aspect, because of stand density related to intraspecific competition.
An Analysis of Forest Community and Dynamics According to Elevation in Mt. Sokri and Odae
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 238~246
This study evaluated forest vegetation structure according to elevation in Mt. Sokri and Odae. The dominance of Pinus densiflora, Quercus variabilis, Quercus serrata, Prunus serrulata var. spontanea was apparent at elevations below 500 m. Quercus mongolica, Fraxinus sieboldiana, Acer pseudo-sieboldianum and Symplocos chinensis for. pilosa were conspicuous above 800 m. Significant P. densiflora, Rhus trichocarpa, Lindera obtusiloba and P. serrulata var. spontanea populations appeared below 700 m elevation in Mt. Odae. Q. mongolica, F. sieboldiana, A. pseudo-sieboldianum, Tilia amuresis, Abies holophylla, Carpinus cordata, Betula costata, Kalopanax pintus and Pinus koraiensis were conspicuous at elevations 1000 m and above. P. densiflora, Q. monoglica, Q. serata, R. trichocarpa and L. obtusiloba populations were significant at elevations below 700 m. Q. mongolica, F. sieboldiana, A. pseudo-sieboldianum, T. amurensis, A. holophylla, C. cordata appeared at elevations above 1000 m.
Estimation of Site Index by Species in Gyungi and Chungcheong Provinces Using a Digital Forest Site Map
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 247~254
This study was conducted to develop site index equations by main species grown in Gyunggi and Chungcheong provinces using environmental factors obtained from a digital forest site map. For this, 28 environmental factors were regressed on site index by species. Four to five environmental factors by species were selected as independent variables in the best site index equations (coefficients of determination greater than 0.91). For these site index equations, three evaluation statistics, mean difference, standard deviation of difference, and standard error of difference, were applied to the data set. Site index equations by species relationships developed in this study effectively estimate forest productivity in the study area. However, the site index equation of Larix leptolepis showed a larger than expected bias between the estimated and the measured site index. The reason is not clear in this situation, but might be because of the small sample set. It will be necessary, therefore, to conduct more studies to determine the exact reason. It is also expected that the site index equations with a few environmental factors as independent variables could provide valuable information about species well suited to given site conditions. Site index equations for other species should be developed to establish a rational policy about the selection of best species for site conditions.
Traits of Agro-meteorological Disasters in 20th Century Korea
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 255~260
Recently, both climate change and unusual meteorological disasters are becoming a more frequent and serious threat to agricultural production. Destruction of the stabilizing base of agricultural productivity in Korea is a concern. This study provides basic information for stabilizing agricultural production by clarifying and analyzing the features of agro-meteorological disasters which have occurred recently in Korea. The occurrence of meteorological disasters has increased rapidly since the 1940s. A 19-fold increase in occurrence is noted over the past 60 years from 1941 to 2000. Meteorological disasters occurred mostly in August, then in July, and least often in October, In terms of regional occurrences, the frequency of meteorological disasters was the highest in Gangwon (751 times) and in Jeonnam (703 times) provinces, and the lowest in Jeju (459 times) province for the 97 years from 1904 to 2000. Agro-meteorological disasters which caused the most serious damage to cropland were rain storms and typhoons for the 10 years from 1991 to 2000, and they occurred 52 and 18 times during this period, respectively. Agro-meteorological disasters occurred mainly during the summer season (from June to September) when major crops are cultivated in Korea.
An Optimum Scale for Topoclimatic Interpolation of Daily Minimum Temperature in Complex Terrain
Korean Journal of Agricultural and Forest Meteorology, volume 5, issue 4, 2003, Pages 261~265
Cold air accumulation plays a critical role in formulating daily minimum temperature in complex terrain on radiative cooling nights, and spatial interpolation can be improved by accommodating this important topoclimatic variable. Little is known about the spatial scale for computing cold air accumulation which influences daily minimum temperature. Air temperature was measured at 10-minute intervals during September 2002- February 2003 at eight locations within a 1 by 1 km hilly orchard area. Minimum temperature data for suspected radiative cooling nights were collected, and the deviations from reference observations at a near-by KMA automated weather station were calculated. A digital elevation model with a 10m cell size was used to calculate the cold air accumulation at 8 locations. Zonal averages of the cold air accumulation were computed for each location by increasing the cell radius from 1 to 10. Temperature deviations were regressed to a common logarithm of the smoothed averages of cold air accumulation to derive a linear relationship between the local temperature deviation and the site topography. The highest coefficient of determination (
= 0.78) was found at a cell radius of 5, which corresponds to an approximately 1 ha boundary surrounding the point of interest.