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运用Dynamax液流测量系统监测浙江庙山坞自然保护区毛竹液流的日变化,采用型号为EQ-15的土壤水势仪监测0～100cm土层的土壤水势,利用自动气象站同步监测太阳总辐射、空气温度、空气相对湿度、风速等气象因子。结果表明:晴朗天气条件下毛竹液流的日变化过程呈现单峰曲线,具有显著的昼夜变化规律,且变幅大;阴雨天气时液流日变化过程呈双峰或多峰曲线,而且日均液流速率和日液流量均低于晴朗天气,变化较平缓;不同径阶毛竹液流速率波动规律相同,但径级较大毛竹的日均液流速率和液流量较大一些。当0～100cm土层土壤水势在-13～-10kPa时,毛竹液流速率与土壤水势相关性不显著,但当土壤水势低于-200kPa左右时,液流速率和土壤水势呈正相关,土壤水分含量成为限制液流速率的主要因子之一;相关性分析表明,边材液流速率与空气温度、空气相对湿度、光合有效辐射、总辐射、水蒸气压亏缺呈极显著正相关,与空气相对湿度呈极显著负相关。太阳辐射、气温、空气湿度、风速等环境因子作自变量,以液流速率作因变量,经过逐步回归,建立了液流速率与环境因子的多元线性模型。
The diurnal variation of Phyllostachys pubescens flow in the Miaoshanwu Nature Reserve in Zhejiang Province was monitored by the Dynamax flow measurement system. The soil water potential at 0 ~ 100cm soil layer was monitored by the soil water potential meter EQ-15. The total solar radiation was monitored by the automatic weather station , Air temperature, air relative humidity, wind speed and other meteorological factors. The results showed that the diurnal course of diurnal course of the bamboo flow showed a single peak curve under clear weather conditions, with significant diurnal variation and large amplitude. The daily diurnal variation of diurnal flow showed a bimodal or multi-peak curve in rainy weather, The liquid flow rate and daily liquid flow rate were lower than the sunny weather, the change was relatively gentle. Fluctuations in the flow rate of Phyllostachys pubescens Phyllostachys pubescens were the same, but the average daily flow rate and liquid flow were larger in Phyllostachys pubescens. When the soil water potential of 0 ~ 100cm soil layer was between -13 ~ -10kPa, the correlation between the flow rate and the soil water potential was not significant, but when the soil water potential was lower than about -200kPa, the flow rate was positively correlated with the soil water potential. The correlation analysis showed that the sap flow rate was significantly and positively correlated with air temperature, air relative humidity, photosynthetically active radiation, total radiation, and water vapor pressure deficit, and the correlation with air Relative humidity showed a significant negative correlation. The environmental factors such as solar radiation, temperature, air humidity and wind speed were used as independent variables, and the multivariate linear model of liquid flow rate and environmental factors was established by stepwise regression using the flow rate as the dependent variable.