Dissertation > Agricultural Sciences > Crop > Cereal crops > Rice

Experiment and Mathematical Model of Rice Photosynthesis under Controlled Irrigation

Author HuangQian
Tutor PengShiZhang
School Hohai University
Course Agricultural Soil and Water Engineering
Keywords Rice Control irrigation Soil moisture Net photosynthetic rate Photosynthetic characteristics Photosynthesis model Stomatal conductance Water use efficiency
CLC S511
Type Master's thesis
Year 2005
Downloads 299
Quotes 2
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Rice shallow irrigation control, under controlled irrigation of rice leaf net photosynthetic rate, photosynthetic characteristics of CO2 assimilation and other photosynthetic indicators. Taking into account environmental factors affecting crop photosynthesis, photosynthetic active radiation, air temperature, relative humidity, air CO2 concentration and net photosynthetic rate of the rice were analyzed, and on this basis, analyzes the soil moisture regulation on rice net photosynthetic rate the impact. The the photosynthetic model simulated photosynthetic rate of rice, and soil moisture on photosynthesis model as a correction term correction. Control irrigated rice photosynthetic data validation. Initially explored the relationship between internal factors affecting photosynthesis stomatal conductance and photosynthetic rate, calculate and compare the diurnal variation of the whole growth variation in leaf water use efficiency of rice under control irrigation and conventional irrigation conditions. This paper analysis the following conclusions: 1. Consistent change control irrigation and conventional irrigated rice photosynthetic rate curve - days. Control irrigated rice photosynthetic rate peak most periods slightly dominant peak emergence time is often different. Control irrigated rice at tillering, jointing booting stage, heading and flowering and milk stages manifested photosynthetic characteristics (peak photosynthetic rate, average, maximum and average value of the ratio) is almost always higher than conventional irrigation. The two irrigation mode unit leaf area of ??rice CO2 assimilation in major growth period was essentially flat, control irrigated rice dominant, but there was no significant difference. Has a good consistency the Rice CO2 assimilation in the variation of the entire growth period variation of net photosynthetic rate in rice growth period. The fertility of soil moisture regulation indicators meet the the photosynthetic physiological requirements, in whole growth period can be used to maintain the photosynthetic characteristics of rice, almost no decline in rice photosynthetic rate close to the water lower limit indicators. 5. Saeki-Monsi light response model simulation accuracy. Its soil moisture correction, simulation results, compared with the original model applicability and accuracy has been improved, and can obtain the most suitable for rice photosynthetic soil moisture. 6 rice in jointing booting stage and heading flowering period photosynthetic rate maximum (Pmax) and quantum efficiency (α) is the highest level, most of the growth period of rice irrigation control Pmax and α greater than conventional irrigation. Slightly higher than in the the tillering stage conventional irrigation water use efficiency of rice irrigation control in the flowering stage, jointing booting and milky stage control irrigated rice is slightly higher than conventional irrigation, but the the two treatment differences did not reach Hohai the University Thesis significant level. Keywords: rice photosynthesis model stomatal conductance and water use efficiency of photosynthetic characteristics of net photosynthetic rate control irrigation soil moisture

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