Simulation on Distribution of Photosynthetically Active Radiation in Canopy and Optimum Leaf Rolling Index in Rice with Rolling Leaves
| Autor: | Ke-min Yao, Ning Hu, Jiang-shi Zou, Chuan-gen Lu |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Canopy
effective leaf area index rice Plant density leaf rolling index Plant Science lcsh:Plant culture Photosynthesis utilization efficiency Horticulture Photosynthetically active radiation Botany lcsh:SB1-1110 Leaf area index Interception population density photosynthetically active radiation Agronomy and Crop Science Biotechnology Mathematics |
| Zdroj: | Rice Science, Vol 16, Iss 3, Pp 217-225 (2009) |
| ISSN: | 1672-6308 |
| DOI: | 10.1016/s1672-6308(08)60082-7 |
| Popis: | By replacing leaf area index (LAI) with effective leaf area index (ELAI) through introduction of leaf rolling index (LRI), the distributions of photosynthetically active radiation (PAR) in the canopies of three hybrid rice combinations, Liangyou E32 with high LRI, Liangyoupeijiu with moderate LRI and Shanyou 63 with non-rolling leaves (normal), were simulated. The model based on ELAI could predict more accurately than that based on LAI. The PAR interception, conversion and utilization efficiency in the three combinations were studied to evaluate their optimal LRI and LAI. The PAR utilization efficiency of Liangyou E32 was lower due to excessive rolling leaves and less ELAI, and that of Shanyou 63 was also lower because of the faulty PAR interception and lower photosynthetic rate and saturation point at lower layer in canopy. Compared with the above two combinations, Liangyoupeijiu showed more appropriate distribution of PAR interception and conversion efficiency in canopy, and higher PAR utilization efficiency. The optimal LRI and LAI for Liangyoupeijiu were 0.11 and 7.6, respectively, which were close to the observed value, 0.11 and 7.9, respectively. However, the optimum LAI was 9.8 for Liangyou E32 and 6.2 for Shanyou 63, larger or smaller than those under the current plant density, which led to lower efficiency of PAR utilization. Besides, the optimum LRI for Liangyou E32 and Shanyou 63 were 0.12 and 0.08, respectively, which were close to the actual LRI for Liangyoupeijiu (0.11). |
| Databáze: | OpenAIRE |
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