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cje ›› 2005, Vol. ›› Issue (9): 1021-1024.

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Characteristics of soil temperature dynamics in vegetable field and its forecasting model in Guangzhou

DU Yaodong, LIU Jinluan, HE Jian   

  1. Climatic and Agrometeorological Center of Guangdong Province, Guangzhou 510080, China
  • Received:2004-11-23 Revised:2004-12-21 Online:2005-09-10

Abstract: According to the observing data of soil temperature in vegetable field and nearby air temperature,dynamic of soil temperature in vegetable field and its forecasting model were studied in Guangzhou.The results showed that the amplitude of soil temperature in vegetable field were small and the phase lagged behind air temperature.The phase lag of daily change was more obvious than that of annual change.Daily amplitude of soil temperature gradually decreased and the phase lagged more obviously with the increase of soil depth.Daily change of soil temperature under clear weather was greater than that under overcast weather.Soil temperature had distinct linear correlations with air temperature.Forecasting formulae of soil in different depths established by air temperature had higher precisions,with their average absolute and relative errors mostly lower than 0.5 ℃ and 10% respectively.

Key words: Alkaline phosphatase(ALP), Succinate dehydrogenase(SDH), Hyphae, Mycorrhizal colonization, Growth

CLC Number: