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首页> 外文期刊>Journal of forest research >Sap flow of irrigated Populus alba var. pyramidalis and its relationship with environmental factors and leaf area index in an arid region of Northwest China
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Sap flow of irrigated Populus alba var. pyramidalis and its relationship with environmental factors and leaf area index in an arid region of Northwest China

机译：灌溉白杨的汁液流量。西北干旱区锥体类动物及其与环境因子和叶面积指数的关系

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Populus alba L. var. pyramidalis Bge. (Populus) is a main tree of the farmland shelter-belt system in the arid region of Northwest China. However, soil moisture cannot satisfy the water requirements of normal Populus growth under local natural conditions, thus studying the transpiration characteristics of irrigated Populus and its relationship with the environmental factors and growth parameters is very important to the growth of the trees in this region. In this study, the sap flow of two irrigated Populus trees was measured during May to September from 2005 to 2008 using the heat-pulse technique. The results show that the maximum and minimum daily sap fluxes in Populus were 15.7-24.0 and 3.0-4.0 L dayp#, respectively. And the sum of sap fluxes from June to August accounted for approximately 63-69% of the total sap flux during May to September (almost the whole growing season). The order of the meteorological factors affecting the daily sap flux of Populus was: vapor pressure deficit > solar radiation > mean air temperature > wind speed. Furthermore, a highly linear relationship between the ratio of daily sap flux to the reference evapotranspiration (SF/ET) and the amount of soil water in the 0-2.0 m layer was found, indicating that the amount of soil water at this layer was quite important to the growth of Populus in this region. Especially, the amount of soil water in the 0.5-1.0 m soil layer contributed to most of the plant transpiration as the highest coefficient of determination at this layer. Based on the environmental factors and leaf area index influencing sap flux, an empirical transpiration model was constructed to estimate daily transpiration.
机译：杨白杨金字塔（Populus）是西北干旱地区农田防护林带系统的主要树种。然而，土壤水分不能满足当地自然条件下正常杨树生长的需水量，因此研究灌溉杨树的蒸腾特性及其与环境因子和生长参数的关系对于该地区树木的生长非常重要。在这项研究中，使用热脉冲技术在2005年至2008年5月至9月期间测量了两棵灌溉杨树的树液流量。结果表明，胡杨的最大和最小日树汁通量分别为15.7-24.0和3.0-4.0 L dayp＃。 6月至8月的汁液通量总量约占5月至9月（几乎整个生长季节）的汁液通量的63-69％。影响胡杨日树液通量的气象因素顺序为：蒸气压亏缺>太阳辐射>平均气温>风速。此外，在0-2.0 m的层中发现了每日树液通量与参考蒸散量（SF / ET）之比与土壤水量之间的高度线性关系，表明该层的土壤水量相当大。对于该地区的胡杨生长至关重要。特别是，在0.5-1.0 m的土壤层中，土壤水分的量对大多数植物的蒸腾作用起了决定性作用，成为该层的最高测定系数。基于影响树液通量的环境因素和叶面积指数，建立了经验蒸腾模型以估算日蒸腾量。

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