Webinar—Leaf area index (LAI): The expert guide—Theory, methods, and application скачать в хорошем качестве

Webinar—Leaf area index (LAI): The expert guide—Theory, methods, and application

Discover METER sensors: https://www.metergroup.com/en/meter-e... Measure LAI with the LP-80: https://metergroup.com/products/accup... In this webinar, plant physiologist Jeff Ritter explains the practical application of Leaf Area Index and how this measurement will transform your research. The ins and outs of LAI: Leaf Area Index (LAI) has vast implications across land use management, ecology, and any project impacted by gross primary productivity (GPP). But multiple measurement methods make the process of choosing the best method for your application confusing. How do you balance accuracy and labor efforts? Join us February 27th, 2024 at 9am PST to find out. In this webinar, METER’s Product Manager for plant, canopy, and atmospheric monitoring, Jeff Ritter, will discuss: What is LAI? Why measure LAI? Direct sampling methods, including litter traps Indirect ground-based methods, including hemispherical photography The difference between transmittance and reflectance methods Satellite-based approaches How to choose the right method for your project that balances precision and labor intensity Presenter: Jeff Ritter is the Product Manager for plant, canopy, and atmospheric monitoring instrumentation here at METER. He earned his master’s degree in plant physiology from Washington State University, where his research focused on leaf-level gas exchange, and the impact of plant biochemistry on the measurement of the global carbon cycle. Prior to working at METER, he held a research faculty position at Washington State University in the Department of Crop and Soil Sciences. Learn more about Jeff Ritter:   / jeff-ritter-0b7013293   Subscribe: https://metergroup.com/en/meter-envir... Follow us:   / meter_env     / meter-group   Questions? Our scientists have decades of experience helping researchers and growers measure the soil-plant-atmosphere continuum. Talk to an expert: Request a quote Disclaimer: The views and opinions expressed in the webinar and on this posting are those of the individual speakers or authors and do not necessarily reflect or represent the views and opinions held by METER. #metergroup #leafareaindex #plantcanopy #plantphysiology Chapters: 00:00 Introduction 01:29 Start of presentation 06:13 Defining leaf area index (LAI) 08:05 Why measure leaf area index 12:14 How to measure LAI 13:54 Measuring LAI: Destructive harvesting 15:24 Measuring LAI litter traps 16:13 Measuring LAI leaf scanning 17:13 Indirect methods 18:18 Hemispherical photography 20:21 Thresholding 21:30 Hemispherical photography considerations 23:46 Indirect method PAR Transmittance 25:23 PAR Transmittance Beer's law 26:44 Using Beer's law 28:22 Solar zenith angle 29:11 Lead angle distribution parameter 35:19 Direct beam fraction & PAR absorptance 38:22 Ratio of transmitted light 39:44 Measuring PAR transmittance 42:30 Example 44:59 Reflectance 45:57 Normalized difference vegetative index (NDVI) 48:00 NDVI as a proxy 49:30 Scaling 51:28 Application specific considerations 53:14 QR Code for complete guide to leaf area index 53:34 Conclusion 54:16 Questions 54:47 Is it appropriate to use an open canopy measurement of PAR transmittance to substitute for an above canopy measurement? 55:56 In general, what time of day should be best for taking LAI, or what other factors should they consider in taking LAI in a big field 57:07 Do you have any insight for using hemispherical cameras with a smaller canopy? 58:10 Taking LAI on plants with complex leaf structure with small leafs even climbing plants different things like that?