陇南地区土壤水分及气象因子对油橄榄树干液流的响应特征

在初步掌握油橄榄树干液流的变化规律基础上，探索土壤水分、气象因子与树干液流的关系。结果表明，油橄榄树茎流量随太阳辐射强度增大而呈现迅速降低的趋势，随空气相对湿度的增加逐渐减小，与空气温度呈正相关关系，由于高温抑制作用，空气温度>29.78℃时，茎流量有小幅下降的趋势，土壤温度在12.51℃～25.06℃时，油橄榄树茎流量随土壤温度升高而缓慢增大，但当土壤温度>30.86℃时，油橄榄树茎流量也会逐渐下降。通过分析油橄榄茎流速率与气象因子之间的关系，构建了多元线性回归模型，生产上可根据此模型推导出油橄榄树的潜在茎流量，以此为依据提出合理的节水补灌制度。

Influence of Soil Moisture and Meteorological Factors on Stem Sap Flow of Olive in Southern Gansu

The objectives of this study were to understand the variation regularities of trunk sap flow of olive trees (Olea europaea) occurring in southern Gansu,and to investigate the relationship of the sap flow with soil moisture and meteorological factors.The results showed that the sap flow decreased rapidly with the increase of the intensity of solar radiation,decreased gradually with the increase of air relative humidity.The sap flow was positively correlated with atmospheric temperature.When the temperature was higher than 29.78℃,due to the inhibition effect,the sap flow tended to slightly decline.The sap flow slowly increased with the soil temperature in the range of 12.51℃ to 25.06℃.It would be decreased gradually when the soil temperature was higher than 30.86℃.A multiple linear regression model was constructed by analyzing the relationship between the sap flow rate and meteorological factors.The model could be used to calculate the potential sap flow in practical production,and to manipulate a reasonable water-saving irrigation system.