Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (7): 1372-1378.doi: 10.3864/j.issn.0578-1752.2014.07.014

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

The Influence of Solar Radiation and Water Demand on Microalgae Production

 FENG  Ting, Shu  GENG, WU  Hua-nan, SHI  Ping   

  1. School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen 518055, Guangdong
  • Received:2013-10-16 Online:2014-04-01 Published:2013-12-18

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Abstract: 【Objective】Microalgae accumulate lipids through photosynthesis, thus can be used to produce biofuel. In addition, microalgae can also be used as supplement for food, oil, and feed. Microalgae cultivation is not compete with terrestrial plants for land resource, thus holding a great potential for the sustainable agricultural development. The commercialization development cannot be obtained without high microalgae productivity. This paper aims to quantify the influence of evapotranspiration and solar radiation on microalgae productivity.【Method】Based on the field production system of Zhaokai Bioenergy Research Center, diatom was cultivated in open pond culture system and the daily productivity data were collected. Meanwhile, the meteorological data were collected from local weather stations of Shenzhen Weather Bureau and the University Town Weather Station. SIMMETEO Model was applied to estimate the daily evapotranspiration data of diatom cultivation system. Based on the photosynthesis and evapotranspiration models, a microalgae productivity model was developed by using solar radiation and evapotranspiration data as inputs.【Result】Results showed that temperature influenced diatom productivity in a relatively small amount with R² about 0.46 in fitted growth curve. Solar radiation as well as evapotranspiration had a significant influence on diatom productivity with R2 above 0.6 in the fitted growth curves. Moreover, the R2 of the sigmoidal regression between daily solar radiation and evapotranspiration was 0.96, which indicates a strong correlation between these two variables. When the daily average solar radiation increased from 9.67 to 12.67 MJ•m-2, evapotranspiration also increased. When daily solar radiation was above 12.67 MJ•m-2, the water demand of algae growth became saturated and maintained at 4.63 mm per day. Evapotranspiration also had a significant influence on microalgae growth with R2 = 0.637 in the fitted growth curves. The cumulative amount of evapotranspiration during the cultivation process represents the total water demand for the growth. Microalgae growth was limited without enough water supplies. Meanwhile, the water demands also increased with the rising productivity.【Conclusion】Optimal solar radiation and evapotranspiration values are essential impact factors for microalgae cultivation. Analyzing the evapotranspiration and water demand during the growth phase will contribute for identifying the important meteorological impacts on algae growth and providing an effective management guide for efficient water application.

Key words: evapotranspiration , solar radiation , diatom productivity , microalgae cultivation , sustainable agriculture

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