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cje ›› 2009, Vol. 28 ›› Issue (09): 1763-1766.

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Main ecological characteristics of Jerusalem artichoke (Helianthus tuberosus L.) in aeolian sandy land.

KONG Tao1,2;WU Xiang-yun1;LIU Ling-ling2;YAN Han2   

  1. 1College of Resource and Environment Engineering, Liaoning Technical Univ ersity, Fuxin 123000, Liaoning, China;2College of Science, Liaoning Technical University, Fuxin 123000, Liaonin g, China
  • Online:2009-09-10 Published:2009-09-10

Abstract: With developed root system and strong drought-resistance, Jerusalem artichoke (Helianthus tuberosus L.) has an important function in wind prevention and sand fixation. In order to reveal its growth adaptability and its mechanisms of wind prevention and sand fixation, the main ecological characteristics of Jerusalem artichoke in Keerqin sandy land were studied. The growth and development of Jerusalem artichoke could be divided into three stages, i.e., seedling emergence, fast growth, and tuber expanding. The growth and dry matter accumulation of
aboveground organs increased slowly within the first 8 weeks, and rapidly since then. The tuber began to fast grow from the 18th week, and peaked at the 23rd week, with the dry matter accumulation reached 298.15 g per plant. The photosynthesis indices had close relationships with dry matter accumulation. Leaf area index and photosynthetic potential began to have a logarithmic increase from the 9th week (aboveground part fast growth stage), and peaked at the 18th week (subterranean tuber expanding stage), with the value of 6.55 and 401016 m2·d-1·hm-2, respectively. The relative leaf chlorophyll content was the maximum (38.4) when the dry matter in aboveground organs began to transfer into tuber.

Key words: Photosynthesis-evapotranspiration coupled model, Water and heat fluxes, Diurnal variation