Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy
Because the leaf area index (LAI) is an essential parameter for understanding the structure and growth status of plant canopies, nondestructive and continuous estimation methods have been required. Recently, an LAI estimation method using the ratio of near-infrared radiation (NIR; 700–1000 nm) to ph...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Society for Horticultural Science (ASHS)
2022-12-01
|
| Series: | HortScience |
| Subjects: | |
| Online Access: | https://journals.ashs.org/hortsci/view/journals/hortsci/58/1/article-p16.xml |
| _version_ | 1811169809096769536 |
|---|---|
| author | Hiromu Yamaguchi Daisuke Yasutake Tomoyoshi Hirota Koichi Nomura |
| author_facet | Hiromu Yamaguchi Daisuke Yasutake Tomoyoshi Hirota Koichi Nomura |
| author_sort | Hiromu Yamaguchi |
| collection | DOAJ |
| description | Because the leaf area index (LAI) is an essential parameter for understanding the structure and growth status of plant canopies, nondestructive and continuous estimation methods have been required. Recently, an LAI estimation method using the ratio of near-infrared radiation (NIR; 700–1000 nm) to photosynthetically active radiation (PAR; 400–700 nm) (NIRin/PARin) transmitted through a canopy has been proposed. However, because previous studies on this NIRin/PARin-based LAI estimation method are limited to tall plants (e.g., forest and rice canopies), in this study, we applied this method to a short canopy (i.e., spinach) and investigated its validity. NIRin/PARin and three other traditional indices for indirect LAI estimation—relative PPF density (rPPFD), normalized difference vegetation index (NDVI), and simple ratio (SR)—were measured in 25 canopies with different LAI. NIRin/PARin showed better estimation sensitivity (R2 = 0.88) to the observed LAI than the other three indices, particularly when LAI was greater than 3 m2·m−2. In addition, the LAI estimated from NIRin/PARin measured at 10-min intervals in the entire growth period could capture an increasing trend in the measured LAI throughout the entire growth stage (mean absolute error = 0.87 m2·m−2). Errors in long-term LAI estimations may be caused by the sensor location and insufficient data due to unsuitable weather conditions for measuring NIRin/PARin. The current study demonstrates the merits and limitations of the NIRin/PARin-based LAI estimation method applied to low height canopies, thereby contributing to its practical use in horticultural crops. |
| first_indexed | 2024-04-10T16:47:48Z |
| format | Article |
| id | doaj.art-9ab6751ba75b48e69388b5566bd25dde |
| institution | Directory Open Access Journal |
| issn | 2327-9834 |
| language | English |
| last_indexed | 2024-04-10T16:47:48Z |
| publishDate | 2022-12-01 |
| publisher | American Society for Horticultural Science (ASHS) |
| record_format | Article |
| series | HortScience |
| spelling | doaj.art-9ab6751ba75b48e69388b5566bd25dde2023-02-07T19:10:23ZengAmerican Society for Horticultural Science (ASHS)HortScience2327-98342022-12-015811622https://doi.org/10.21273/HORTSCI16761-22Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable CanopyHiromu Yamaguchi0Daisuke Yasutake1Tomoyoshi Hirota2Koichi Nomura3Kyushu UniversityKochi UniversityKyushu UniversityKochi UniversityBecause the leaf area index (LAI) is an essential parameter for understanding the structure and growth status of plant canopies, nondestructive and continuous estimation methods have been required. Recently, an LAI estimation method using the ratio of near-infrared radiation (NIR; 700–1000 nm) to photosynthetically active radiation (PAR; 400–700 nm) (NIRin/PARin) transmitted through a canopy has been proposed. However, because previous studies on this NIRin/PARin-based LAI estimation method are limited to tall plants (e.g., forest and rice canopies), in this study, we applied this method to a short canopy (i.e., spinach) and investigated its validity. NIRin/PARin and three other traditional indices for indirect LAI estimation—relative PPF density (rPPFD), normalized difference vegetation index (NDVI), and simple ratio (SR)—were measured in 25 canopies with different LAI. NIRin/PARin showed better estimation sensitivity (R2 = 0.88) to the observed LAI than the other three indices, particularly when LAI was greater than 3 m2·m−2. In addition, the LAI estimated from NIRin/PARin measured at 10-min intervals in the entire growth period could capture an increasing trend in the measured LAI throughout the entire growth stage (mean absolute error = 0.87 m2·m−2). Errors in long-term LAI estimations may be caused by the sensor location and insufficient data due to unsuitable weather conditions for measuring NIRin/PARin. The current study demonstrates the merits and limitations of the NIRin/PARin-based LAI estimation method applied to low height canopies, thereby contributing to its practical use in horticultural crops.https://journals.ashs.org/hortsci/view/journals/hortsci/58/1/article-p16.xmlleaf area indexnirparnondestructive methodtransmittancehorticulture |
| spellingShingle | Hiromu Yamaguchi Daisuke Yasutake Tomoyoshi Hirota Koichi Nomura Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy HortScience leaf area index nir par nondestructive method transmittance horticulture |
| title | Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy |
| title_full | Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy |
| title_fullStr | Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy |
| title_full_unstemmed | Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy |
| title_short | Nondestructive Measurement Method of Leaf Area Index Using Near-infrared Radiation and Photosynthetically Active Radiation Transmitted through a Leafy Vegetable Canopy |
| title_sort | nondestructive measurement method of leaf area index using near infrared radiation and photosynthetically active radiation transmitted through a leafy vegetable canopy |
| topic | leaf area index nir par nondestructive method transmittance horticulture |
| url | https://journals.ashs.org/hortsci/view/journals/hortsci/58/1/article-p16.xml |
| work_keys_str_mv | AT hiromuyamaguchi nondestructivemeasurementmethodofleafareaindexusingnearinfraredradiationandphotosyntheticallyactiveradiationtransmittedthroughaleafyvegetablecanopy AT daisukeyasutake nondestructivemeasurementmethodofleafareaindexusingnearinfraredradiationandphotosyntheticallyactiveradiationtransmittedthroughaleafyvegetablecanopy AT tomoyoshihirota nondestructivemeasurementmethodofleafareaindexusingnearinfraredradiationandphotosyntheticallyactiveradiationtransmittedthroughaleafyvegetablecanopy AT koichinomura nondestructivemeasurementmethodofleafareaindexusingnearinfraredradiationandphotosyntheticallyactiveradiationtransmittedthroughaleafyvegetablecanopy |