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应用热扩散式树干茎流计(TDP)于2012年7月1日至7月25日,在克拉玛依地区农业开发区对银白杨(Populus alba L.×P.talassica)人工林树干液流速率进行了连续测定,并对气象、土壤水分等指标进行了同步测定。结果表明:7月份的晴天银白杨树干液流速率日变化呈单峰型,阴天呈多峰型,在测量时期液流速率日平均值为0.6059 L/h;银白杨树干单位边材面积的液流速率与太阳总辐射、大气温度、水汽压差呈极显著正相关关系,与相对湿度呈负相关关系。其相关系数绝对值顺序为太阳总辐射>大气温度>水汽压差>相对湿度>风速;银白杨边材面积与胸径之间存在着显著的线性相关关系,相关系数为0.834,单位边材面积的液流速率随树干胸径的增大而减小。
Application of Thermal Diffusion Trunk Stem Flow Meter (TDP) From July 1 to July 25, 2012, the sap flow rate of Populus alba L. × P. talassica plantation in the Karamay Agricultural Development Zone A continuous determination of the weather, soil moisture and other indicators were measured simultaneously. The results showed that the diurnal variation of sap flow velocity in Populus tremula was single peak in July and multi-peak in cloudy day. The average daily flow rate was 0.6059 L / h during the measurement period. The area of sapling The flow rate has a significant positive correlation with the total solar radiation, the atmospheric temperature and the water vapor pressure, and has a negative correlation with the relative humidity. The order of absolute value of the correlation coefficients was solar total radiation> atmospheric temperature> water vapor pressure difference> relative humidity> wind speed. There was a significant linear correlation between the area of saplings and the diameter at breast height with a correlation coefficient of 0.834. Flow rate decreases with increasing trunk diameter.