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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
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Volume & Issues
Volume 10, Issue 4 - Dec 2008
Volume 10, Issue 3 - Sep 2008
Volume 10, Issue 2 - Jun 2008
Volume 10, Issue 1 - Mar 2008
Selecting the target year
Changes in Chlorophyll Content and Leaf Damages of Liliodendron tulipifera L. Seedlings Treated with Simulated Acid Rain
Yoon, Jun-Hyuck ; Lee, Do-Hyung ; Woo, Kwan-Soo ;
Korean Journal of Agricultural and Forest Meteorology, volume 10, issue 3, 2008, Pages 75~81
DOI : 10.5532/KJAFM.2008.10.3.075
This study was conducted to analyze the influence of simulated acid rain on leaves of Liliodendron tulipifera seedlings. The seedlings were treated with four levels of simulated acid rain with pH of 5.6, 4.9, 3.9 and 2.9, and then chlorophyll contents and the degree of foliar damage were investigated. Differences were statistically significant among treatments in chlorophyll contents in all of the tested soils. The total contents of chlorophyll tended to decrease as the simulated acid rain treatment was maintained. Chlorophyll contents, however, did not decrease according to the decrement of pH levels. Foliar damage increased as the simulated acid rain was maintained in all tested soils. Especially, the damage dramatically increased between May and July as the acidity increased. As the treatment of simulated acid rain continued, deformed new leaves appeared. In all treatments except the control, the leaves turned brown and the damage increased with time. Necrotic spots appeared during the first month of treatment at the pH level of 2.9 in all soil types. The damage by acid rain should be considered when we plant Liliodendron tulipifera.
Processing and Quality Control of Flux Data at Gwangneung Forest
Lim, Hee-Jeong ; Lee, Young-Hee ;
Korean Journal of Agricultural and Forest Meteorology, volume 10, issue 3, 2008, Pages 82~93
DOI : 10.5532/KJAFM.2008.10.3.082
In order to ensure a standardized data analysis of the eddy covariance measurements, Hong and Kim's quality control program has been updated and used to process eddy covariance data measured at two levels on the main flux tower at Gwangneung site from January to May in 2005. The updated program was allowed to remove outliers automatically for
and latent heat fluxes. The flag system consists of four quality groups(G, D, B and M). During the study period, the missing data were about 25% of the total records. About 60% of the good quality data were obtained after the quality control. The number of record in G group was larger at 40m than at 20m. It is due that the level of 20m was within the roughness sublayer where the presence of the canopy influences directly on the character of the turbulence. About 60% of the bad data were due to low wind speed. Energy balance closure at this site was about 40% during the study period. Large imbalance is attributed partly to the combined effects of the neglected heat storage terms, inaccuracy of ground heat flux and advection due to local wind system near the surface. The analysis of wind direction indicates that the frequent occurrence of positive momentum flux was closely associated with mountain valley wind system at this site. The negative
flux at night was examined in terms of averaging time. The results show that when averaging time is larger than 10min, the magnitude of calculated
fluxes increases rapidly, suggesting that the 30min
flux is influenced severely by the mesoscale motion or nonstationarity. A proper choice of averaging time needs to be considered to get accurate turbulent fluxes during nighttime.
A Prospect on the Changes in Short-term Cold Hardiness in "Campbell Early" Grapevine under the Future Warmer Winter in South Korea
Chung, U-Ran ; Yun, Jin-I. ;
Korean Journal of Agricultural and Forest Meteorology, volume 10, issue 3, 2008, Pages 94~101
DOI : 10.5532/KJAFM.2008.10.3.094
Warming trends during winter seasons in East Asian regions are expected to accelerate in the future according to the climate projection by the Inter-governmental Panel on Climate Change (IPCC). Warmer winters may affect short-term cold hardiness of deciduous fruit trees, and yet phenological observations are scant compared to long-term climate records in the regions. Dormancy depth, which can be estimated by daily temperature, is expected to serve as a reasonable proxy for physiological tolerance of flowering buds to low temperature in winter. In order to delineate the geographical pattern of short-term cold hardiness in grapevines, a selected dormancy depth model was parameterized for "Campbell Early", the major cultivar in South Korea. Gridded data sets of daily maximum and minimum temperature with a 270m cell spacing ("High Definition Digital Temperature Map", HDDTM) were prepared for the current climatological normal year (1971-2000) based on observations at the 56 Korea Meteorological Administration (KMA) stations and a geospatial interpolation scheme for correcting land surface effects (e.g., land use, topography, and site elevation). To generate relevant datasets for climatological normal years in the future, we combined a 25km-resolution, 2011-2100 temperature projection dataset covering South Korea (under the auspices of the IPCC-SRES A2 scenario) with the 1971-2000 HD-DTM. The dormancy depth model was run with the gridded datasets to estimate geographical pattern of change in the cold-hardiness period (the number of days between endo- and forced dormancy release) across South Korea for the normal years (1971-2000, 2011-2040, 2041-2070, and 2071-2100). Results showed that the cold-hardiness zone with 60 days or longer cold-tolerant period would diminish from 58% of the total land area of South Korea in 1971-2000 to 40% in 2011-2040, 14% in 2041-2070, and less than 3% in 2071-2100. This method can be applied to other deciduous fruit trees for delineating geographical shift of cold-hardiness zone under the projected climate change in the future, thereby providing valuable information for adaptation strategy in fruit industry.
Relationships between Litterfall Amounts and Stand Attributes in a Quercus accutissima Stand
Kim, Choon-Sig ; Park, Jin-Young ; Byun, Jae-Kyung ; Jeong, Jae-Yeob ; Shin, Hyun-Cheol ; Lee, Sang-Tae ;
Korean Journal of Agricultural and Forest Meteorology, volume 10, issue 3, 2008, Pages 102~106
DOI : 10.5532/KJAFM.2008.10.3.102
This study was carried out to evaluate the relationships between stand attributes and litterfall amounts in a 28-year old Quercus acutissima stand. Eighteen sampling plots of
were chosen and litterfall was collected from May 2005 to December 2006. There was no correlation between stand attributes(tree density, mean diameter at breast height, mean height, basal area) and litterfall amounts except for flower and miscellaneous litter for the study period. There were no significant relationships between leaf litter and basal area(r=0.02, 0.05; P=0.93, 0.83) and between leaf litter and tree density(r=-0.10, 0.05; P=0.85, 0.69). Also, leaf litter was affected neither by mean diameter at breast height(r=-0.08, 0.30; P=0.73, 0.22) nor by mean height(r=-0.24, 0.09; P=0.34, 0.70). Other litter amounts such as bark, branch, and acorn showed no relationships with the stand attributes (P>0.05). The lack of significant relationships between litterfall amounts and stand attributes could be due to the closed canopy with a complete crown cover in this mature oak stand.
Appreciation of the Meteorological Knowledge from "Jeung-Bo-San-Lim-Gyeong-Je"
Ryoo, Sang-Boom ; Lee, Byong-Lyol ;
Korean Journal of Agricultural and Forest Meteorology, volume 10, issue 3, 2008, Pages 107~112
DOI : 10.5532/KJAFM.2008.10.3.107
"Jeung-Bo-San-Lim-Gyeong-Je" (meaning "Revised Forest Management") has been well recognized as the informative document that introduces scientific knowledge and experiences of Korean ancestors regarding weather and climate. The tradition of Gwan-Cheon-Mang-Gi(i.e., empirical forecasting of short-term weather phenomena based on the status of cloud or sky) has been continuously utilized as a civilian weather forecasting method and even for very short-term weather prediction by operational forecasters these days. This agricultural technology textbook, published during the Great King Youngjo in Chosun-Dynasty, may be regarded as a poorly written document from the modern standpoint. Nonetheless, this study demonstrates that by and large the empirical knowledge contained in the book is indeed science based although their applications are limited to several hours for local forecasts in agricultural practices and daily living. For example, the wisdom of keeping water at an optimum level in a paddy field after sowing to prevent young seedlings from late frost damages was not at all different from the present technique of vinyl covered seedling nursery.