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首页> 外文期刊>Forest Systems >Water use pattern of Pinus tabulaeformis in the semiarid region of Loess Plateau, China
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Water use pattern of Pinus tabulaeformis in the semiarid region of Loess Plateau, China

机译：黄土高原半干旱区油松水分利用格局。

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Aim of the study : We analyzed the water-use strategy of P. tabulaeformis and determine the relationships between environmental factors and transpiration rates in the P. tabulaeformis woodlands. Area of study : Loess Plateau region of Northwest China. Material and Methods : Sap flow density of the P. tabulaeformis trees was measured with Granier-type sensors. Stand transpiration was extrapolated from the sap flow measurements of individual trees using the following Granier equation. Main results : The mean sap flow rates of individual P. tabulaeformis trees ranged from 9 L day ? 1 to 54 L day ? 1 . Photosynthetically active radiation and vapor pressure deficit were the dominant driving factors of transpiration when soil water content was sufficient (soil water content>16%), considering that soil water content is the primary factor of influencing transpiration at the driest month of the year. During the entire growing season, the maximum and minimum daily stand transpiration rates were 2.93 and 0.78 mm day ?1 , respectively. The mean stand transpiration rate was 1.9 mm day ?1 , and the total stand transpiration from May to September was 294.1 mm. Research highlights : This study can serve as a basis for detailed analyses of the water physiology and growth of P. tabulaeformis plantation trees for the later application of a climate-driven process model. {end} Sap flow; stand transpiration; environmental factor; Pinus tabulaeformis ; Loess Plateau.
机译：研究目的：我们分析了油松林地的水分利用策略，并确定了环境因素与蒸腾速率之间的关系。研究领域：中国西北黄土高原地区。材料和方法：用Granier型传感器测量油松树木的树液流密度。使用以下Granier方程从单棵树的树干液流测量值推断林分蒸腾量。主要结果：单个油松树的平均树液流量为9 L天？ 1至54 L天？ 1。当土壤含水量足够（土壤含水量> 16％）时，考虑到一年中最干燥的月份土壤水分是影响蒸腾作用的主要因素，光合作用的辐射和蒸气压不足是蒸腾作用的主要驱动因素。在整个生长季节中，最大和最小的每日林分蒸腾速率分别为2.93和0.78 mm天？1。平均林分蒸腾速率为1.9 mm·day？1，5月至9月的总林分蒸腾值为294.1mm。研究重点：该研究可作为详细分析油松人工林水生理和生长的基础，以供以后应用气候驱动过程模型使用。 {end}汁液流动;蒸腾作用环境因素油松;黄土高原。

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