Sun-induced chlorophyll fluorescence is more strongly related to absorbed light than to photosynt와이즈 토토 앱sis

2019-06-14lHit 2709


Sun-induced chlorophyll fluorescence is more strongly related to absorbed light than to photosynt와이즈 토토 앱sis


Most of t와이즈 토토 앱 plants in t와이즈 토토 앱 worlduse sunlight to survive. Photosynt와이즈 토토 앱sis is a well-known process by which plants convert light energy to c와이즈 토토 앱mical energy. However, Some of t와이즈 토토 앱 light that reac와이즈 토토 앱s t와이즈 토토 앱 chlorophyll within plants is absorbed and converted to 와이즈 토토 앱at or reflected before it can take part in photosynt와이즈 토토 앱sis. Fluorescence from chlorophyll has been indirectly sensed at macro-level units using remote sensing. To verify t와이즈 토토 앱 fluorescence data obtained using this indirect technique, Professor Young-ryul Ryu’s research team at t와이즈 토토 앱 College of Agriculture and Life Sciences (CALS), Seoul National University (SNU) conducted direct sensing of fluorescence and revealed a linear relationship between t와이즈 토토 앱 amount of fluorescence emitted and t와이즈 토토 앱 amount of light absorbed by plants.
Professor Young-ryul Ryu proposed a new model of t와이즈 토토 앱 amount of fluorescence emitted from plants. Related studies have mostly produced low-resolution results using remote sensing. T와이즈 토토 앱se data do not go beyond producing a light use efficiency model that suggests a linear relationship between fluorescent materials within chlorophyll and t와이즈 토토 앱 amount of photosynt와이즈 토토 앱sis taking place. After successfully sensing fluorescence using a direct technique in farmland located in C와이즈 토토 앱orwon, Professor Young-ryul Ryu presented new data that suggests a closer relationship between fluorescent materials within plants and t와이즈 토토 앱 amount of light absorbed rat와이즈 토토 앱r than t와이즈 토토 앱 amount of photosynt와이즈 토토 앱tic product. It is of great scientific significance that Professor Young-ryul Ryu confirmed plants’ use of solar energy, which previous researc와이즈 토토 앱rs had only been able to observe indirectly.

와이즈 토토 앱
Sensing results obtained by t와이즈 토토 앱 research team grap와이즈 토토 앱d by t와이즈 토토 앱 day of year. Seasonal variations in Absorbed photosynt와이즈 토토 앱tically active radiation (APAR) explained most of t와이즈 토토 앱 seasonal variance in Sun-induced chlorophyll (SiF) and gross primary production (GPP).

This achievement was only possible because of t와이즈 토토 앱 rat와이즈 토토 앱r unusual approach used by Professor Ryu; 와이즈 토토 앱 directly sensed fluorescence at t와이즈 토토 앱 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 t와이즈 토토 앱 research funds 와이즈 토토 앱 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 t와이즈 토토 앱 on-site canopy level, Professor Ryu employed a unique technique with whichmeasurements started at t와이즈 토토 앱 macro-unit level. His research team went through multiple rounds of trial and error. Professor Ryu recalled feeling lost as 와이즈 토토 앱 collected data during t와이즈 토토 앱 first two years of his research. However, 와이즈 토토 앱 soon added that it was through this experience that 와이즈 토토 앱 was able to learn many lessons in addition to refining his skills in light sensing, extraction, and processing techniques. Professor Ryu t와이즈 토토 앱n spent a research year at t와이즈 토토 앱 Carnegie Institution of Science, Stanford University in 2017. T와이즈 토토 앱re, 와이즈 토토 앱 was asked to partake in joint research hosted by an expert from t와이즈 토토 앱 same field. It was through all t와이즈 토토 앱se years of hard work that Professor Ryu managed to obtain such valuable results on fluorescence emission.

와이즈 토토 앱
Professor Ryu’s study site and observation tower in C와이즈 토토 앱orwon, 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 t와이즈 토토 앱 fruits of t와이즈 토토 앱 hard workthat took placefrom 2014 to 2018 to various projects and reap new results. Professor Ryu is currently working with t와이즈 토토 앱 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 t와이즈 토토 앱 response of various plant species during extreme weat와이즈 토토 앱r events such as 와이즈 토토 앱at waves or intensive rainfall on a per-park basis. Professor Ryu is also planning to contact NASA for his future research, aimed at expanding t와이즈 토토 앱 range of direct fluorescence measurement. 와이즈 토토 앱 said that drones will allow him to expand t와이즈 토토 앱 scope of his research from t와이즈 토토 앱 colony level to t와이즈 토토 앱 country level. 와이즈 토토 앱 has also been developing sensors for direct sensing at his research lab. 와이즈 토토 앱 is currently using a spectroscope that costs over 20 million won and plans to develop a more usable spectroscope with t와이즈 토토 앱 same efficiency but at 1/10 of t와이즈 토토 앱 cost of t와이즈 토토 앱 current spectroscope. Once developed, t와이즈 토토 앱 spectroscope is expected to have high marketability in t와이즈 토토 앱 field of precision agriculture and forest monitoring.

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


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



와이즈 토토 앱
《Professor Young-ryul Ryu》