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采用包裹式茎流计对位于新疆阿克苏地区温宿县新疆林科院佳木试验站内的幼龄枣树茎流速率进行连续测定,并同步监测样地内太阳辐射、温度、空气湿度以及风速4个环境因子,研究不同生育期枣树茎流特征及其与环境变化的关系。结果表明:1夜间均存在茎流活动,茎流速率变化曲线除果实膨大期为双峰外,其余生育期内均为单峰;2日累积量变化过程曲线均为“S”形,日均耗水量和总耗水量的趋势均为先增大后减小,且差异性明显,萌芽展叶期最低,果实膨大期最大,日均耗水量分别为2.78 L和8.31 L,总耗水量分别为83.39 L和249.30L;3茎流速率曲线与太阳辐射和温度曲线波形变化趋势基本一致,与空气湿度曲线波形变化趋势相反,茎流速率与环境因子进行偏相关分析,影响枣树茎流速率的主要因子有所差异,但太阳辐射偏相关系数最高,按生育期顺次分别为0.767、0.762、0.873、0.838、0.603和0.825,利用多元线性回归对不同生育期枣树茎流速率与环境因子进行逐步回归,经过回归系数和相关系数检验,各多元线性回归方程均达到了显著水平。
The stem flow rate of jujube tree in Jiamu Experimental Station of Xinjiang Academy of Forestry, Wensu County, Aksu Prefecture of Xinjiang Autonomous Region was measured continuously using a wraparound flow meter. The solar radiation, temperature, air humidity and wind speed Environmental Factors and Studying the Stemflow Characteristics of Jujube Trees at Different Growth Stages and Their Relationship with Environmental Changes. The results showed that there was stem flow activity in 1 night, and the change of stem flow rate curve was single peak except during fruit enlargement, while the curve of 2 days accumulation was “S” shape, The average daily water consumption and total water consumption trends first increased and then decreased, and the difference was obvious, the lowest budding leaf expanse, the largest fruit enlargement period, the average daily water consumption were 2.78 L and 8.31 L, the total water consumption Respectively 83.39 L and 249.30 L. The trend of stem flow rate was basically the same as that of solar radiation and temperature. Contrary to the trend of air humidity curve, the correlation between stem flow rate and environmental factors affected the stem flow of jujube tree However, the partial correlation coefficient of solar radiation was the highest, which were 0.767,0.762,0.873,0.838,0.603 and 0.825 respectively according to the growth stages, and the correlations of stem flow rate and environment Factor regression step by step, after regression coefficient and correlation coefficient test, the multiple linear regression equation reached a significant level.