• 한국산림과학회지
• /
• 제76권1호
• /
• pp.11-16
• /
• 1987

잣나무 유묘(幼苗)와 쥐똥나무 삽목묘(揷木苗)를 인공산성우(人工酸性雨)로 처리(處理)하고 엽내(葉內) 엽록소(葉綠素) a와 b의 함량(含量)을 분석(分析)하여 양(量)의 증감(增減)에 따른 산도(酸度) 수준(水準)의 영향(影響)을 논의(論議)하였다. 처리(處理)된 시험수종(試驗樹種)은 1985년(年) 봄에 pot에 재배(栽培)되고 해당지역(該當地域)의 30년간(年間)의 강우(降雨) 양식(樣式)을 모의(模擬)해서 산성우(酸性雨)(pH 수준(水準) 6.5, 4.0 및 2.0)를 5월(月)부터 8월(月)까지 4개월간(個月間)에 걸쳐 살포(撒布)하고, 동년(同年) 9월(月) 18일(日) 성숙(成熟)된 엽(葉)을 채취(採取)하여 엽중(葉中)의 엽록소(葉綠素)를 분석(分析)하였다. 분석(分析) 결과(結果)에 의(依)하면, 양(兩) 수종(樹種) 공통적(共通的)으로 산성우(酸性雨)의 산도(酸度)가 강(强)해짐에 따라 엽록소(葉綠素) a와 b의 함량(含量)은 감소(減少)하는 경향(傾向)을 보였고. 엽록소(葉綠素) a에 있어서는 감소(減少) 경향(傾向)이 통계적(統計的)으로 유의(有意)했고, 엽록소(葉綠素) b의 경우(境遇)는 유의(有意)하지 않았으나 감소(減少) 경향(傾向)이 있는 것으로 받아들일 수 있었다. 산성우(酸性雨)의 pH 수준(水準)에 따른 엽록소(葉綠素) a와 b에 대한 감소(減少) 효과(効果) 차이(差異)에 있어서는 양(兩) 수종(樹種) 모두 pH 수준별(水準別)로 감소(減少) 지수(指數)가 유사(類似)하였으며, 따라서 엽록소(葉綠素) a 대(對) b의 함량비(含量比)는 산성우(酸性雨)의 pH 수준(水準) 여하(如何)에 불구(不拘)하고 일정(一定)한 값을 유지(維持)하고 있었다.

• 한국환경과학회지
• /
• 제4권3호
• /
• pp.177-186
• /
• 1995

The seasonal changes and composition of phytoplankton of the Choonsan reservior were studied from November 1990 to October 1991. 195 taxa which belong to 65 genera, 150 species, 40 varieties and 1 forms were identified. Species number during summer monthes was higher than that of other seasons. Standing crops of phytoplankton were varied from $7.8\times10^5$ cells/l to $2.2\timesl0^6$ cells/$\ell$. The dominant species were Cryptomonas erose and Trachelomonas volvoina. Chlorophyll a contents of phytoplankton was varied from $1.36\mu\textrm{g}/\ell$ to $127.46\mu\textrm{g}/\ell$. The biotic indices of phytoplankton were very similar among three sites. Saprobien-system by index of species diversity suggests that the Choonsan reservior belongs to the oligosaprophic.

• Ocean and Polar Research
• /
• 제29권4호
• /
• pp.391-400
• /
• 2007

To identify the spatial distribution pattern of water quality in Masan Bay, Pearson's correlation as a common statistic method and Moran's I as a spatial autocorrelation statistics were applied to the hydrological data seasonally collected from Masan Bay for two years ($2004{\sim}2005$). Spatial distribution of salinity, DO and silicate among the hydrological parameters clustered strongly while chlorophyll a distribution displayed a weak clustering. When the similarity matrix of Moran's I was compared with correlation matrix of Pearson's r, only the relationships of temperature vs. salinity, temperature vs. silicate and silicate vs. total inorganic nitrogen showed significant correlation and similarity of spatial clustered pattern. Considering Pearson's correlation and the spatial autocorrelation results, water quality distribution patterns of Masan Bay were conceptually simplified into four types. Based on the simplified types, Moran's I and Pearson's r were compared respectively with spatial distribution maps on salinity and silicate with a strong clustered pattern, and with chlorophyll a having no clustered pattern. According to these test results, spatial distribution of the water quality in Masan Bay could be summed up in four patterns. This summation should be developed as spatial index to be linked with pollutant and ecological indicators for coastal health assessment.

• 한국작물학회지
• /
• 제49권2호
• /
• pp.131-135
• /
• 2004

To find out the responses of soybean genotypes in terms of different levels of irrigation with the aim of evaluating the growth, yield, and its optimum levels of irrigation, an experiment was conducted at the Field of Crop Botany Department, Bangladesh Agricultural University, Mymensingh during the period from November 2000 to February 2001. Five levels of irrigation viz. $\textrm{I}_0$: no irrigation, $\textrm{I}_1$: one time irrigation at 20 days after sowing (DAS), $\textrm{I}_2$:two times irrigation at 20 and 40 DAS, $\textrm{I}_3$: three times irrigation at 20, 40, and 60 DAS, and $\textrm{I}_4$: four times irrigation at 20, 40, 60, and 80 DAS and three genotypes of soybean viz. BS-3, BS-16, and BS-60 were used in this experiment. The crop was grown in a split plot design having three replications. The plant height, leaf area index, crop growth rate, shoot dry weight, branches $\textrm{plantI}_{-1}$, filled pods $\textrm{plantI}_{-1}$, seeds $\textrm{plantI}_{-1}$, seed yield, and harvest index were influenced significantly by irrigation and these were found to be highest at three times irrigation except branches $\textrm{plantI}_{-1}$. The chlorophyll content increased but empty pods $\textrm{plantI}_{-1}$ decreased with increase in irrigation levels. Genotypes of soybean varied significantly in terms of growth attributes at various growth stages except shoot dry weight at 90 DAS. The genotype BS-3 performed better compared to other genotypes and gave maximum seed yield.

• Applied Biological Chemistry
• /
• 제14권2호
• /
• pp.149-156
• /
• 1971

신미종(辛味種)고추의 추숙(追熟)에 따른 carotenoid 색소(色素)와 chlorophyll의 변화(變化)를 측정(測定) 고찰(考察)한 결과(結果)는 다음과 같다. 1. 신미종(辛味種) 고추의 carotenoid 색소(色素)를 column chromatography로 6 fraction으로 분리(分離)한 다음 각(各) fraction을 다시 TLC에 의하여 54종(種)을 분리(分離)하고 그 가운데서 30종(種)을 동정(同定)하였다. 2. carotenoid색소(色素) 총량(總量)은 cli. stage에서 급증(急增)하였고 group별(別)로 보니 diol가 가장 함량(含量)이 높고 추숙(追熟)에 따른 함량증가율(含量增加率)이 가장 높았다. 3. carotenoid 색소(色素) 개별당(個別當) 함량(含量) 변화(變化)에서 주목(注目)되는 것은 phytoene이 post cli. stage.에서 감소(減少)하고 고추의 중요(重要)한 carotenoid 색소(色素)인 ${\beta}$-carotene, capsanthin, capsorubin, violaxanthin의 함량(含量)이 크게 증가(增加) 하였다. 4. chlorophyll은 a, b, total 함량(含量)이 다같이 추숙(追熟)에 따라 감소(減少)하고 post-cli. stage에서 소실(消失)하였다.

• 동아시아식생활학회지
• /
• 제17권5호
• /
• pp.671-677
• /
• 2007

This study examined the relationship between chlorophyll(Chl) and ascorbic acid(ASA) as an index of freshness for vegetables, when the general consumers purchase several kinds of vegetables at the market. The leaves and fruits of several types of vegetables were divided into top, middle, and basal sections. Chl was determined by a spectrophotometer, and ASA was analyzed by high-performance liquid chromatography. For the vegetable sections, we found that Chl and ASA levels were highest in the top sections, followed by the middle, and were lowest in the basal portions. For the relationship between Chl and ASA in vegetables, there were seven classifications including high Chl(above 80mg/100g of fresh weight) and high ASA(above 80 mg/100 g of fresh weight) for mallow, and kail; the second group had high Chl and low ASA(below 80 mg), such as in spinach, burdock, and perilla leaves; the third group contained medium Chl($40{\sim}80mg$) and medium ASA($40{\sim}80mg$) levels, such as for gonddalbee, angelica, pumpkin leaf and coriander; the fourth group had medium Chl and low ASA levels, as in crown daisy and lettuce; the fifth group contained low Chl(below 40 mg) and high ASA, such as in hot peppers and parsley; the sixth group had low Chl and medium ASA levels, and included broccoli, pak choi, and sweet peppers; finally the seventh group contained low Chl and low ASA levels, as in dropwort, young radishes, shallots, cucumbers and swiss chard.

• 한국물환경학회지
• /
• 제21권4호
• /
• pp.360-367
• /
• 2005

We have performed to analyze the trophic state resulting of Lake Yongdam as a result of water quality and nutrient concentration. Lake Yongdam is artifitial multi-purpose Dam resulting from the floods of 2001. The water quality of Lake Yongdam may affect the status of the Geum river basin including the Daecheong reservoir. It is necessary to understand the trophic state to assess water quality until stability after flooding. Water quality was surveyed using depth and hydraulic condition analysis. Further density flow was estimated for stratification and trophic state of Lake Yongdam by chlorophyll ${\alpha}$ concentration (2001~2004). And Environmental factors on chlorophyll ${\alpha}$ concentration were analyzed statistically. Trophic state was evaluated as the oligotrophic state at the main stream of the reservoir and eutrophic state at the upper stream in 2001, but evaluated as eutrophic state in 2002 and 2003 by TSI of Aizaki. From the results of multiple regression analysis using stepwise method, chlorophyll ${\alpha}$ concentration was shown to be very significant when nutrient concentration is high upon initial filling of the Dam. Chlorophyll ${\alpha}$ concentration varied according to sample site, season and year. Concentration were high in the upper stream of Lake Yongdam 4, algae bloom in these watershed were affected by location and high nutrient levels in the summer season which have in turn increased phytoplankton bloom into the reservoir.

• Journal of Plant Biotechnology
• /
• 제48권2호
• /
• pp.115-122
• /
• 2021

Aspilia africana (Pers) C.D.Adams, a plant used for centuries in many African countries to treat diseases such as osteoporosis, malaria, tuberculosis, and diabetes, is of great pharmaceutical interest, yet there is limited scientific literature on its germination and growth. This research paper describes the effects of different commercial soils on the germination, growth, and chlorophyll content of A. africana. The germination parameters assessed included final germination percentage (FGP), mean germination time (MGT), and germination index (GI). Shoot length, leaf number, and fresh and dry weights were some of the parameters used to assess A. africana growth. The FGP was low and did not vary significantly; the MGT was 7 ~ 10 days; and the GI was significantly higher in PPS soil at 4.61 ± 0.332 days. Aspilia africana plants in HS:PPS soil showed the best overall growth, producing the highest mean leaf number (18.00 ± 1.129), longest mean shoot length (202.43 ± 13.451 mm), and highest mean fresh and dry weights (7.08 ± 1.061 g and 0.629 ± 0.112 g, respectively). The highest chlorophyll content in leaves of A. africana under HS:PPS conditions suggested a higher photosynthetic potential of plants in this soil. The best growth performance of A. africana in the HS:PPS soil could be attributed to a higher amount of certain mineral nutrients such as nitrogen, potassium, and phosphorus in the HS:PPS soil compared to the other soil categories. It is unclear why the FGP of A. africana was low and we recommend an exclusive study to investigate this further.

• 한국환경복원기술학회지
• /
• 제24권1호
• /
• pp.97-110
• /
• 2021

Vegetation index information is an important figure that is used in many fields such as landscape architecture, urban planning, and environment. Vegetation may vary slightly in vegetation vitality depending on photosynthesis and chlorophyll content. In this study, a range of vegetation worth preserving in the Taehwa River water system was determined, and hyperspectral images of drones were acquired (August, October), and the results were presented through DVI(Normalized Defference Vegetation Index), EVI(Enhanced Vegetation Index), PRI(Photochemical Reflectance Index), ARI (Anthocyanin Reflectance Index) index analysis. In addition, field spectral data and VRS-GPS(Virtual Reference System-GPS) surveys were performed to ensure the quality and location accuracy of the spectral band. As a result of the analysis, NDVI and EVI showed low vegetation vitality in October, -0.165 and -0.085, respectively, and PRI and ARI increased to 0.011 and 7.588 in October, respectively. For general vegetation vitality, it was suggested that NDVI and EVI analysis were effectively performed, and PRI and ARI were thought to be effective in analyzing detailed characteristics of plants by spectral band. It is expected that it can be widely used for park design and landscape information modeling by using drone image information construction and vegetation information.

• 해양환경안전학회지
• /
• 제3권S1호
• /
• pp.77-90
• /
• 1997

the observations in situ and the seawater analyses were conducted in July and August, 1996 for the purpose of evaluating the characteristics of seawater quality centered on eutrophication in Mokpo harbour. By applying the OECD standards of trophic classification to the parameters such as secchi depth, total inorganic nitrogen, phosphate phosphorus and chlorophyll-a, the trophic level of seawater in Mokpo harbour was evaluated to be in eutrophic state in summer. By the estimation of pollution index with relation to eutrophication, the seawater quality of Mokpo harbour was evaluated to be under the regular grades and this evaluation was found to be different from the results of evaluation obtained by the environmental index of single parameter, chemical oxygen demand. By the estimation of eutrophication index, the seawaters of Mokpo harbour were shown to have the high potentiality of red tide occurrence.