How to determine the leaf area index (LAI) using the Yaxin-1241 leaf area meter? In plant ecology studies, the leaf area index is a frequently used indicator of the characteristics of plant crowns. At present, the general methods for obtaining leaf area index are roughly divided into direct method and indirect method. Direct method: refers to the use of different means. For example, the weighing method, the lattice method, the scanning method, and the model method directly measure the area of ​​the leaves to obtain the LAI value. Indirect method: refers to the use of different methods that do not directly contact the blade, such as radiation, grid method, image method, etc., first obtain the "porosity" of the canopy, and then use Beer's law to derive the model in a series of hypotheses. The leaf area index is calculated on the basis. The advantage of the direct method is that the acquisition of the blade area value is intuitive and accurate, and can be used regardless of the type of canopy structure. The disadvantage is that the canopy structure must be broken and continuous dynamic observation at the same sample point is not possible. The observed workload is large and inefficient. The advantage of the indirect method is that it does not destroy the canopy and can be observed continuously at the same point, but different canopy types use different mathematical models. At the same time, due to the limitations of the mathematical model assumptions, the accuracy and repeatability within the same model are not ideal. So how do you measure LAI accurately and quickly? We recommend that you combine the two methods. For a particular structure (eg, cotton field at full bloom), define an area range and then use all the blades within the cut area (if one blade is partially within range and the other is outside the range, then within range) section). The total area was then measured using a Yaxin-1241 leaf area meter. The LAI is obtained by dividing the total area value by the area value. The above measurements were repeated by selecting 3 to 5 sample points, and the average value of LAI was determined as the LAI (A value) of the sub-canopy. Subsequently, the average LAI (B value) of the above sample points was obtained with a Yaxin-1201 canopy meter. Then, A/B=K, the k value is used as the revision factor of the two methods. Indirect methods were used in subsequent tests to increase experimental efficiency and reduce workload. Thus, LAI can also be obtained using the Yaxin-1241 leaf area meter. Flexible consideration when purchasing a canopy. Yaxin-1241 leaf area meter Yaxin-1201 Canopy Beijing Yaxin Utilization Technology Co., Ltd. November 25, 2016 ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.sdsmedtools.com
