关键词: 树干液流, 叶面积指数, 生长季节, 沙枣, 黑河中游

Abstract: The sap flow velocity of Elaeagnus angustifolia was continuously measured during growing season by using heat pulse meter. Results showed that the diurnal sap flow velocity change of Elaeagnus angustifolia hasn't obvious regularity between day and night and the daily average sap flow velocity was between(1.41±0.52)g·cm^-2·h^-1 and(2.00±0.66)g·cm^-2·h^-1; the maximum of average sap flow velocity occurred in August, the second was in July, and the third was in June and in September(it was basically consistent in June and September). As for different individuals, the average sap flow velocity wasn't uniformity in the same month. The average cumulative sap flow showed a strong compound exponential correlation with breast-height diameter(DBH) and product of(DBH)²H, and a linear correlation with sapwood area, and a third power correlation with leaf area index(LAI), respectively.

Key words: sap flow, leaf area index, growing season, Elaeagnus angustifolia, middle reaches of Heihe river basin