Features and Influence Fectors of the Sugar Maple Sap Flow in the Non-growing Seasons
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摘要: 采用EMS 62包裹式植物径流测量系统连续监测非生长季(2016年9月~2017年3月)内4 a生糖槭幼树的树干液流速率的动态变化特征及其影响因素。结果表明:(1)不同月份的糖槭树干液流的日变化呈多峰型,且呈"昼高夜低"的变化趋势,夜间液流特征明显,且零液流速率持续时长不同;(2)糖槭树干液流速率在非生长季的月变化总体上呈下降趋势;(3)9月份,晴天、阴天和雨天3种天气条件下的液流速率日变化均为单峰型,其日均值大小排序为:晴天 > 阴天 > 雨天;(4)3种天气条件下,糖槭树体主干的液流速率均大于侧枝的,但液流峰值有差异;(5)非生长季树干液流变化均与太阳辐射和空气温度呈极显著正相关,与空气湿度和根部土壤湿度均呈极显著负相关。Abstract: In order to understand the dynamics variation characteristics of Acer saccharum sap flow of during 4 years, the sap flow rate was measured from September 2016 to March 2017 by the Sap Flow Set EMS 62, and environmental factors were recorded by the automatic meteorological station. The results showed that (1) diurnal changes of A. saccharum sap flow were of multiple peak types in different months, the high peak happened in daytime and low peak in nighttime. There were obvious characteristics of night sap flow and the durations of zero-rate sap flows varied. (2) The sap flow rate decreased generally from September 2016 to March 2017. (3) In September, the diurnal changes of the sap flow of A. saccharum displayed a single peak type. The order of the sap flow rate in different weather conditions were as follows:sunny > cloudy > rainy day. (4) The sap flow rate of main trunks were higher than that of branches in all weather conditions. But the peak value varied. (5) During the non-growing season, there was a significantly positive correlation between sap flow and light radiation or air temperature, and a significantly negatively correlated with the air humidity or soil moisture.
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Key words:
- Acer saccharum;
- Sap flow;
- Environmental factors
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