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用热扩散式树干径流计(TDP)和环境自动检测系统对黄河三角洲滨海盐碱地刺槐(Robinia pseudoacacia)-绒毛白蜡(Fraxinus velutina)混交林、刺槐纯林中刺槐单株的树干液流速率和环境因子进行了连续观测,结果表明:混交林中的刺槐单株树干液流日变化呈窄峰型曲线,纯林中的呈宽峰型曲线,二者峰值均出现在10:30左右,无明显启动时间,也没有明显的停止界限;混交林中刺槐单株的液流峰值高于纯林;混交林中刺槐单株的日平均液流速率为纯林中的145%。混交林土壤表层(0～60 cm)含水量大于纯林,含盐量小于纯林。多元逐步回归分析表明,影响混交林刺槐树干液流速率的主要因子是太阳辐射强度、大气相对湿度,影响纯林刺槐液流速率的因子依次为大气温度、太阳辐射强度。
The effects of thermal diffusive trunk flowmeter (TDP) and environmental automatic detection system on the sap flow rate and the environmental factors of Robinia pseudoacacia-Fraxinus velutina mixed forest and Robinia pseudoacacia pure forest in coastal saline-alkali soil of the Yellow River Delta, The results showed that the diurnal variation of single tree sap flow in mixed forest showed a narrow peak curve and the broad forest curve showed a broad peak, both of which peaked around 10:30 with no obvious start Time and no obvious stopping limit. The peak of the flow of acacia in mixed forest was higher than that in pure forest. The daily average flow rate of acacia in mixed forest was 145% in pure forest. The water content of soil surface layer (0 ~ 60 cm) in mixed forest was larger than pure forest, and the salt content was less than pure forest. Multivariate stepwise regression analysis showed that the main factors influencing the sap flow rate were the solar radiation intensity, the relative humidity of the atmosphere and the factors influencing the flow rate of A. pseudoacacia in turn as atmospheric temperature and solar radiation intensity.