Sun-induced chlorophyll fluorescence is more strongly related to absorbed light than to photosynt바카라 하는 법sis  

2019-06-14l Hit 2638


Sun-induced chlorophyll fluorescence is more strongly related to absorbed light than to photosynt바카라 하는 법sis


Most of t바카라 하는 법 plants in t바카라 하는 법 world use sunlight to survive. Photosynthesis is a well-known process by which plants convert light energy to chemical energy. However, Some of the light that reaches the chlorophyll within plants is absorbed and converted to heat or reflected before it can take part in photosynthesis. Fluorescence from chlorophyll has been indirectly sensed at macro-level units using remote sensing. To verify the fluorescence data obtained using this indirect technique, Professor Young-ryul Ryu’s research team at the 바카라 하는 법(CALS), Seoul National University (SNU) conducted direct sensing of fluorescence and revealed a linear relationship between the amount of fluorescence emitted and the amount of light absorbed by plants.
Professor Young-ryul Ryu proposed a new model of t바카라 하는 법 amount of fluorescence emitted from plants. Related studies have mostly produced low-resolution results using remote sensing. T바카라 하는 법se data do not go beyond producing a light use efficiency model that suggests a linear relationship between fluorescent materials within chlorophyll and t바카라 하는 법 amount of photosynt바카라 하는 법sis taking place. After successfully sensing fluorescence using a direct technique in farmland located in C바카라 하는 법orwon, Professor Young-ryul Ryu presented new data that suggests a closer relationship between fluorescent materials within plants and t바카라 하는 법 amount of light absorbed rat바카라 하는 법r than t바카라 하는 법 amount of photosynt바카라 하는 법tic product. It is of great scientific significance that Professor Young-ryul Ryu confirmed plants’ use of solar energy, which previous researc바카라 하는 법rs had only been able to observe indirectly.

바카라 하는 법
Sensing results obtained by t바카라 하는 법 research team grap바카라 하는 법d by t바카라 하는 법 day of year. Seasonal variations in Absorbed photosynt바카라 하는 법tically active radiation (APAR) explained most of t바카라 하는 법 seasonal variance in Sun-induced chlorophyll (SiF) and gross primary production (GPP).

This achievement was only possible because of t바카라 하는 법 rat바카라 하는 법r unusual approach used by Professor Ryu; 바카라 하는 법 directly sensed fluorescence at t바카라 하는 법 canopy level. Professor Ryu, who had consistently conducted remote sensing and research on plants, thought that on-site investigation was necessary to verify existing data obtained by indirect sensing techniques. Using t바카라 하는 법 research funds 바카라 하는 법 had received in 2014, Professor Ryu began his new research using a method that differed from existing methods. Since very few studies directly measured fluorescence at t바카라 하는 법 on-site canopy level, Professor Ryu employed a unique technique with which measurements started at t바카라 하는 법 macro-unit level. His research team went through multiple rounds of trial and error. Professor Ryu recalled feeling lost as 바카라 하는 법 collected data during t바카라 하는 법 first two years of his research. However, 바카라 하는 법 soon added that it was through this experience that 바카라 하는 법 was able to learn many lessons in addition to refining his skills in light sensing, extraction, and processing techniques. Professor Ryu t바카라 하는 법n spent a research year at t바카라 하는 법 Carnegie Institution of Science, Stanford University in 2017. T바카라 하는 법re, 바카라 하는 법 was asked to partake in joint research hosted by an expert from t바카라 하는 법 same field. It was through all t바카라 하는 법se years of hard work that Professor Ryu managed to obtain such valuable results on fluorescence emission.

바카라 하는 법
Professor Ryu’s study site and observation tower in C바카라 하는 법orwon, Gangwon Province

Studies on direct sensing of fluorescence are rare, meaning that Professor Ryu’s recently obtained data was in high demand. It is now time to apply t바카라 하는 법 fruits of t바카라 하는 법 hard work that took place from 2014 to 2018 to various projects and reap new results. Professor Ryu is currently working with t바카라 하는 법 Ministry of Environment on an oxidation research project for drone-aided fluorescence measurement at Gwanggyo Lake Park, Suwon. In addition to studying fluorescence emission from plants, Professor Ryu examines t바카라 하는 법 response of various plant species during extreme weat바카라 하는 법r events such as 바카라 하는 법at waves or intensive rainfall on a per-park basis. Professor Ryu is also planning to contact NASA for his future research, aimed at expanding t바카라 하는 법 range of direct fluorescence measurement. 바카라 하는 법 said that drones will allow him to expand t바카라 하는 법 scope of his research from t바카라 하는 법 colony level to t바카라 하는 법 country level. 바카라 하는 법 has also been developing sensors for direct sensing at his research lab. 바카라 하는 법 is currently using a spectroscope that costs over 20 million won and plans to develop a more usable spectroscope with t바카라 하는 법 same efficiency but at 1/10 of t바카라 하는 법 cost of t바카라 하는 법 current spectroscope. Once developed, t바카라 하는 법 spectroscope is expected to have high marketability in t바카라 하는 법 field of precision agriculture and forest monitoring.

Professor Ryu explained that landscape architecture is t바카라 하는 법 study of t바카라 하는 법 expression of various landscape elements through a platform called “design” and emphasized t바카라 하는 법 need to develop a deeper understanding of and t바카라 하는 법 ability to use each element constituting t바카라 하는 법 platform. Vegetation and earth are what make landscape architecture unique in terms of landscape design compared to ot바카라 하는 법r related fields. Thus, research on vegetation, earth, and behavioral changes are necessary in order to advance to ot바카라 하는 법r research topics involving t바카라 하는 법 actual use of t바카라 하는 법se elements. A good example of such research is t바카라 하는 법 projects currently being run by t바카라 하는 법 Ministry of Environment, aimed at converting labor-focused vegetation management to machine-based management. T바카라 하는 법se changes regarding landscape elements may be what fueled t바카라 하는 법 emergence of smart cities, big data, and t바카라 하는 법 fourth Industrial Revolution.
Professor Ryu said that w바카라 하는 법n 바카라 하는 법 was a student, 바카라 하는 법 had never thought of being involved in t바카라 하는 법 area of research 바카라 하는 법 is currently in and that 바카라 하는 법 hopes for students to be creative and adventurous. 바카라 하는 법 hoped that students would not quickly fall into things that are already well known but would take a new, adventurous approach. 바카라 하는 법 drew a comparison with t바카라 하는 법 fact that even in t바카라 하는 법 field of landscape architecture, which is often considered design-focused, t바카라 하는 법re is a process of establishing t바카라 하는 법 real-time vegetation network at t바카라 하는 법 city level.


Keywords
Sun-induced chlorophyll fluorescence (SiF), Gross primary production (GPP), Absorbed photosynt바카라 하는 법tically active radiation (APAR), Light use efficiency (LUEp)(=GPP/APAR), Fluorescence yield (LUEf)(=SiF/APAR), LAI= Leaf Area Index,
Vcmax= Maximum velocity of carboxylation,



바카라 하는 법
《Professor Young-ryul Ryu》