论文部分内容阅读
采用包裹式茎流计持续测定枣树茎流速率,并结合HOBO小气候仪同步获取太阳辐射强度、温度、空气相对湿度以及风速等气象数据,研究不同天气条件下枣树茎流速率的变化规律及其与气象因素之间的关系。结果表明:枣树茎流连续日变化呈现明显的规律性,白天的茎流速率明显大于晚上。茎流速率日变化曲线晴天为典型的宽型单峰曲线,阴雨天为不规则的多峰曲线。2种天气条件下,枣树日累积茎流量变化过程均呈现明显的“S”形曲线,且晴天的日累积茎流量明显高于阴雨天。枣树茎流速率与气象因子关系密切,2种天气条件下,茎流速率与太阳辐射强度相关性最强,与风速相关性最弱,利用多元回归的方法建立枣树茎流速率与气象因素的相关性回归模型,经过回归系数和相关系数检验,晴天回归系数为0.901,阴雨天为0.803,均达到极显著水平。
Stem flow rate of jujube trees was continuously measured with a wraparound flow meter and the synoptic data of solar radiation intensity, temperature, air relative humidity and wind speed were simultaneously acquired with HOBO microclimate instrument to study the changes of stem flow rate of jujube tree under different weather conditions. Its relationship with meteorological factors. The results showed that the daily variation of stem flow of jujube tree showed obvious regularity, and the flow rate of stem in daytime was obviously higher than that in night. The diurnal variation curve of stem flow rate is a typical broad unimodal curve, while the cloudy and rainy days are irregular multi-peak curves. Under the two weather conditions, the daily flow of jujube tree showed a significant “S” curve, and the daily accumulated stem flow of the sunny day was obviously higher than that of the rainy days. Jujube stem flow rate and weather factors are closely related to the two weather conditions, the stem flow rate and solar radiation intensity strongest, and the weakest correlation with wind speed, the use of multiple regression method to establish jujube stem flow rate and meteorological factors Regression model and correlation coefficient test, the sunny regression coefficient was 0.901, rainy days was 0.803, reached a significant level.