Evaluating transpiration from Pinus sylvestris var. mongolica and Caragana microphylla using sap flow method
Evaluating transpiration from Pinus sylvestris var. mongolica and Caragana microphylla using sap flow method
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发表时间：
2008
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通讯作者：
Niu Li;Yue Guang-yang;Z. Ha-lin
中科院分区：
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作者：
Niu Li;Yue Guang-yang;Z. Ha-lin
2006年8月，采用树干液流法测定了科尔沁地区桑迪20年生樟子松-小叶锦鸡儿混交种植园树干液流速率，并根据其边材面积和叶面积估算了单株蒸腾速率。结果表明，两树种蒸腾速率的变化与光合有效辐射和水汽压亏缺的变化有显著相关，樟子松的蒸腾速率与土壤水分动态的关系最密切，樟子松的蒸腾速率与土壤水分动态的关系最密切，樟子松的蒸腾速率与土壤水分动态的关系最密切在半干旱环境中，小叶锦鸡儿蒸腾量较高，且相对稳定，日蒸腾量为0.51 - 2.79 mm/d，日蒸腾量为0.81 mm/d，日蒸腾量为0.21 ~ 1.17 mm/d，日蒸腾量为0.81 mm/d，日蒸腾量为0.51-2.79 mm/d，日蒸腾量为0.81 mm/d，日8月混交林的蒸腾量为86.5mm，占同期降水量的137.7%。
Sap flow rates were determined using sap flow methods in August,2006 from a 20-year-old mixed plantation of Pinus sylvestris var.mongolica and Caragana microphylla at a sandy site located in the Horqin Region of northeastern China.Sap flow rates were then used to estimate transpiration of individual trees based on their sapwood areas and leaf areas.Furthermore, the relationship between water use and soil moisture dynamics was also analyzed.The results showed that variations in transpirations of both tree species were significantly related to the changes in photosynthetically active radiation and vapor pressure deficit.The transpiration rates for P.sylvestris var.mongolica showed a declining trend over the study period,ranging from 0.21 to 1.17 mm per day with an average value of 0.81 mm per day.The transpiration from C.microphylla was relatively high and stable in semi-arid environment,and its daily transpiration values were 0.51-2.79 mm per day,with an average of 1.98 mm per day.The total transpiration from the mixed forest in August amounted to 86.5 mm,which represented 137.7% of the precipitation over the same period.