• Journal of Applied Biological Chemistry
• /
• v.57 no.4
• /
• pp.331-336
• /
• 2014

Sediment and nutrient loading caused by the forest to conversion of agricultural lands have led to the deterioration in near water ecosystem. This study was carried out to examine the effects of agroforest culture field and open field culture field on water quality and runoff loading of nutrient. The runoff loading of Tot-N and Tot-P in agroforest culture field were similar to open field culture field. The runoff loading of total suspended solids (TSS) in agroforest culture field and open field culture field were $2,721kg{\pm}196/10a$ and $420{\pm}29kg/10a$ in 2011 and $696kg{\pm}59/10a$ and $463{\pm}36kg/10a$ in 2012, respectively. Our investigation showed that the runoff loading of TSS from agroforest culture field decreased when soil cover and soil stabilization increased. Therefore, protect facility of soil erosion for early alteration of agricultural lands are needed to minimize the soil erosion from agroforest culture field.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2022.04a
• /
• pp.32-32
• /
• 2022

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
• /
• 2018.06a
• /
• pp.77-78
• /
• 2018

• 산림경영
• /
• s.56
• /
• pp.6-7
• /
• 1990

• 산림경영
• /
• s.142
• /
• pp.14-18
• /
• 2000

• Journal of Korean Society of Forest Science
• /
• v.112 no.1
• /
• pp.117-125
• /
• 2023

Outbreaks of Ramulus mikado (Insecta: Phasmatodea: Phasmatidae) in the hilly areas of Mt. Bongsan, Mt. Cheonggye, and elsewhere in Seoul and Gyeonggi occurred from 2020 to 2021, causing serious defoliation. We evaluated the insecticidal effects of six eco-friendly organic materials and the insect-pathogenic fungus Metarhizium anisopliae against R. mikado. The fungus was isolated from naturally dead bodies of R. mikado in forest ecosystems. The results revealed that three eco-friendly organic materials containing azadirachtin or geraniol as active ingredients showed high mortality in the range of 85.2%-100%, which were rates similar to that of the chemical insecticide fenitrothion emulsifiable concentrate. All R. mikado adults that were sprayed with a conidial suspension of M. anisopliae at different concentrations were killed within a few days. In conclusion, three eco-friendly organic materials and M. anisopliae could be good alternatives to chemical insecticides.

• Journal of agriculture & life science
• /
• v.46 no.4
• /
• pp.93-99
• /
• 2012

This study was conducted to investigate photosynthetic characteristics of two-year-old of Adenophora triphylla var. japonicum grown under control (full sunlight) and three different shading treatment (25, 50, and 75% shading treatment). Total chlorophyll contents like chlorophyll a and b content had not significant difference among treatments. Net photosynthetic rate of control and 25% treatment were higher than 50% and 75% treatment. Seedlings grown under full sunlight showed the highest photosynthetic activity such as photosynthetic rate, stomatal conductance and intercellular $CO_2$ concentration except for water use efficiency which was relative higher under 50% and 75% treatment.

• Journal of agriculture & life science
• /
• v.46 no.1
• /
• pp.83-90
• /
• 2012

This study was undertaken to analyze 1) the growth characteristics for the optimal planting density and 2) reached ages of sap tapping for the planting timing of Acer okamotoanum in natural and plantation stand. Soil in natural stand was significantly more fertile than that of plantation stand. Early growth of A. okamotoanum in plantation stand was affected by planting density. Results showed that there was a positive relationship between the DBH and crown width in both natural and plantation stands. Reached ages by DBH were no significant difference in natural stands. Reached ages on DBH 10 cm were approximately 19 and 9 in natural and plantation stands, respectively.

• Journal of agriculture & life science
• /
• v.45 no.4
• /
• pp.23-28
• /
• 2011

This study was carried out to provide the basic information for variety improvement by means of nut characteristics of chestnut variety cultivated in Suncheon area. While Tsukuba has the largest number of burr with 125.5, it showed significant difference among chestnut variety. Average number of nuts per burr ranged from 1.3 in Kunumi to 2.4 in Pyeonggi, which showed significant difference among chestnut variety. Average nut weight varied between 17.5 g in Isseumo to 28.1 g in Kunumi. Nut yield ranged form 1,000.4 g in Sangrim to 5,479.5 g in Tsukuba, which showed significant difference among chestnut variety. Changbanggamyul had the highest rate of healthy nut, Kunumi, Tanzawa, Tsukuba, Daebo, Pyeonggi, and Sinyipyeong had the rate of healthy nut more than 80%. The rate of split pericarp showed significant difference among chestnut variety as ranged from 0.0% in Changbanggamyul to 26.1% in Gwangdeok.

• 산림경영
• /
• s.140
• /
• pp.35-36
• /
• 1999

산림청은 `98년말 현재 우리나라 산림면적은 국토의 65$\%$인 6,436천ha라고 밝혀졌다. 이는 산림청이 출범한 1967년도 6,640천ha에 비하면 서울시 면적의 3.4배에 이르는 204천ha가 줄어든 것이다. 또한 `98년 한해동안 남산면적(297ha)의 17배가 감소되었다고 한다.