SPAC System Transfer Potential of Grape Variation

Abstract：In the extreme drought conditions, the mature Thompson Seedless grapes as research material, the use of drip irrigation technology, the use of the pressure chamber, water potential under different water treatment device on vineyard soil-plant-atmosphere continuum （SPAC） and associated water potential gradient factor on the continuously measured simultaneously, the results show that： in the space level, the vineyards SPAC water potential of the various elements of the atmosphere from the soil into the plant and then gradually declined, with the irrigation quota increase of potential difference between adjacent interface increases. In time sequence, the vineyards at SPAC water potential of the various elements of change and changes in the past few days were decreased, the decrease in the atmosphere the most, followed by leaves, soil minimum; leaf water potential and water potential changes in the atmosphere peaks seen in the 16.00 with the decline of soil water potential of soil decreased from shallow to deep; of pine forest in the SPAC water potential environmental factors, leaf water potential and soil water potential relationship was significant, in the treatment of soil and atmospheric water potential and leaf water potential and atmospheric correlation between water potential is higher than the other two water treatment and irrigation quota increased to between soil and leaves, between leaf and atmosphere, and atmospheric and soil water potential difference between the increase.