不同强度净风频繁吹袭对樟子松(Pinus sylvestris var.mongolica)幼苗光合蒸腾特征的影响
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中国科学院寒区旱区环境与工程研究所,中国科学院寒区旱区环境与工程研究所,鲁东大学生命科学学院,中国科学院寒区旱区环境与工程研究所,中国科学院寒区旱区环境与工程研究所,中国科学院寒区旱区环境与工程研究所

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国家自然科学基金面上项目(31270752,30972422)


Effects of wind frequency on the rates of photosynthesis and transpiration in Pinus sylvestris var. mongolica seedlings
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Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou,Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou,,Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou,Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou,Cold and Arid Regions Environment and Engineering Institute,CAS,Lanzhou

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    摘要:

    为了解不同强度净风频繁吹袭对樟子松幼苗光合蒸腾特性的影响,2013年春季在内蒙古科尔沁沙地研究了0(对照)、6、9、12、15、18 m/s等6个风速处理(分别相当于0、4、5、6、7、8级风)4次吹袭下樟子松幼苗光合速率、蒸腾速率、水分利用效率等指标的变化。结果表明,净风频繁吹袭没有改变樟子松幼苗的光合速率和蒸腾速率的日变化规律,但可使其光合蒸腾的“午休”时间加长、“休眠”程度加深;随着风吹强度的增加,其日均光合能力和蒸腾速率显著降低,其中18 m/s处理较对照分别下降27.6%和22.3%;随着风吹强度增加,气孔导度、胞间CO2浓度均先下降后回升,除18 m/s处理胞间CO2浓度显著高于CK外,其他处理均显著低于CK;随着风吹强度增加,水分利用效率和光能利用效率均先增加后下降,其中除18 m/s处理的水分利用效率显著低于CK,6 m/s处理的光能利用效率高于CK外,其他处理的水分利用效率均高于CK,光能利用效率均低于CK;日均光合蒸腾速率的下降主要源于气孔导度的降低,而水分利用效率和光能利用效率的变化均受制于光合速率和蒸腾速率的变化。

    Abstract:

    To understand the effects of frequent gusts of wind on the rates of photosynthesis and transpiration in Pinus sylvestris var. mongolica seedlings, a field wind-blowing experiment using a wind speed gradient of 0 (CK), 6, 9, 12, 15, and 18 m/s and four episodes of wind blowing was conducted in the spring of 2013 in the Horqin Sand Land of Inner Mongolia. The results showed that:1) Frequent wind blowing did not change the diurnal variation in the rates of photosynthesis and transpiration in seedlings, but resulted in in an extension of midday depression and a higher degree of dormancy in photosynthesis and transpiration. 2) Increasing the wind strength led to a significant decrease in the average daily rates of photosynthesis and transpiration, with a decrease of 27.6% and 22.3% in the 18 m/s-treated seedlings compared to the CK, respectively. With an increase in wind strength, stomatal conductance and intercellular CO2 concentrations first increased and then decreased, and were significant lower in all treatment groups as compared with the CK group, with the exception of intercellular CO2 concentration, which was higher in the 18 m/s group. 3) Increasing the wind-sand flow strength led to a significant increase in water-use efficiency, except for a significant decrease in the 18 m/s treatment group as compared with the CK group. In addition, the efficiency of sunlight energy use tended to decrease except for a significant increase in the 6 m/s-treatment group as compared with the CK group. 4) Decreases in the average daily rates of photosynthesis and transpiration resulted from a decrease in stomatal conductance, and changes in water-use efficiency and sunlight energy-use efficiency resulted from changes in the rates of photosynthesis and transpiration.

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赵哈林,李瑾,周瑞莲,云建英,冯静,苏娜.不同强度净风频繁吹袭对樟子松(Pinus sylvestris var.mongolica)幼苗光合蒸腾特征的影响.生态学报,2017,37(5):1431~1437

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