Citation
Awal M. A., . and Wan Ishak W. I., . and Endan J., . and Mohd. Haniff Harun, . (2004) Determination of extinction canopy coefficient in oil palm plantation. [Proceedings Paper]
Abstract
Extinction coefficient is an important attribute for determining indirect LAI using Beer-Lambert Law which is difficult to measure in oil palm. In this study Beer-Lambert Law was applied to determine the mean and range of the extinction coefficient k. An independent experimental data set of canopy transmittance and LAI were collected from seven different palm age groups which was used to estimate ;k; values. LAI values were determined by destructive direct method while the circular method was used to determine the radiation interception by the canopy. Results showed that the lowest ;k; value 0.278 was obtained for the 16 year old palms and the highest ;k; was 0.762 value obtained for 2-year old palm. The ;k; value of 3 7 9 and 12-year old palm groups were 0.755 0.389 0.373 and 0.282 respectively. There are several potential factors which significantly affect ;k; values. In this study spatial variation height of the quantum sensor and canopy depth were evaluated as potential factors affecting ;k;.
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Abstract
Extinction coefficient is an important attribute for determining indirect LAI using Beer-Lambert Law which is difficult to measure in oil palm. In this study Beer-Lambert Law was applied to determine the mean and range of the extinction coefficient k. An independent experimental data set of canopy transmittance and LAI were collected from seven different palm age groups which was used to estimate ;k; values. LAI values were determined by destructive direct method while the circular method was used to determine the radiation interception by the canopy. Results showed that the lowest ;k; value 0.278 was obtained for the 16 year old palms and the highest ;k; was 0.762 value obtained for 2-year old palm. The ;k; value of 3 7 9 and 12-year old palm groups were 0.755 0.389 0.373 and 0.282 respectively. There are several potential factors which significantly affect ;k; values. In this study spatial variation height of the quantum sensor and canopy depth were evaluated as potential factors affecting ;k;.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK710.2 M239 2004 Call Number |
| AGROVOC Term: | Oil palm |
| AGROVOC Term: | Plantations |
| AGROVOC Term: | Leaf area index |
| AGROVOC Term: | Tree and stand measurement |
| AGROVOC Term: | Measurement |
| AGROVOC Term: | Leaf canopy |
| AGROVOC Term: | Canopy layer |
| AGROVOC Term: | Spatial distribution |
| AGROVOC Term: | Height classes in forestry |
| AGROVOC Term: | Foliage |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:15 |
| URI: | http://webagris.upm.edu.my/id/eprint/12807 |
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