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    陈波, 鲁绍伟, 李少宁. 不同优势等级杨树人工林吸收臭氧特征[J]. 北京林业大学学报, 2015, 37(7): 29-36. DOI: 10.13332/j.1000-1522.20140012
    引用本文: 陈波, 鲁绍伟, 李少宁. 不同优势等级杨树人工林吸收臭氧特征[J]. 北京林业大学学报, 2015, 37(7): 29-36. DOI: 10.13332/j.1000-1522.20140012
    CHEN Bo, LU Shao-wei, LI Shao-ning. Ozone uptake characteristics in different dominance hierarchies of poplar plantation[J]. Journal of Beijing Forestry University, 2015, 37(7): 29-36. DOI: 10.13332/j.1000-1522.20140012
    Citation: CHEN Bo, LU Shao-wei, LI Shao-ning. Ozone uptake characteristics in different dominance hierarchies of poplar plantation[J]. Journal of Beijing Forestry University, 2015, 37(7): 29-36. DOI: 10.13332/j.1000-1522.20140012

    不同优势等级杨树人工林吸收臭氧特征

    Ozone uptake characteristics in different dominance hierarchies of poplar plantation

    • 摘要: 本文基于树干液流的技术方法,在自然状态下对不同优势等级杨树吸收臭氧特征进行了研究。结果表明:臭氧浓度日变化呈单峰型,其变化范围在25.5~175.0μg/m3之间,臭氧浓度变化趋势与温度变化趋势一致;不同优势等级杨树臭氧吸收速率和臭氧冠层导度日变化均为单峰型;臭氧吸收速率表现为劣势木(43.24nmol/(m2·s))>中等木(29.77nmol/(m2·s))>优势木(24.56nmol/(m2·s)),臭氧冠层导度为优势木(101.59mmol/(m2·s))>劣势木(92.92mmol/(m2·s))>中等木(81.60mmol/(m2·s))。不同优势等级臭氧吸收速率均值为(32.52±7.87)nmol/(m2·s),臭氧冠层导度均值为(92.04±8.18)mmol/(m2·s)。不同优势等级太阳辐射、水汽压亏缺和温度对臭氧冠层导度和臭氧吸收速率的影响均表现为优势木>劣势木>中等木。臭氧浓度的峰值滞后于液流密度的峰值,过高的臭氧浓度会抑制树木蒸腾,大气臭氧浓度变化和树干液流密度具有较好的一致性,树干液流技术适用于计算植物的臭氧吸收量。

       

      Abstract: The ozone uptake characteristics of poplar under natural conditions in different dominance hierarchies were studied based on sap flow methods. The results showed that: the diurnal variation of ozone concentration was of single peak type, with the value ranging between 25.5 and 175.0μg/m3; the tendency of its variation was consistent with that of temperature; the diurnal variations of the ozone uptake rate (F_o_3) and canopy ozone conductance (G_o_3) in different tree shape levels were of unimodal type; the change of F_o_3 followed an order of depressed tree (43.24nmol/(m2·s)) > middle tree (29.77nmol/(m2·s)) > dominant tree (24.56nmol/(m2·s)), while the value of G_o_3 ranked as the dominant tree (101.59mmol/(m2·s)) > depressed tree (92.92mmol/(m2·s)) > middle tree (81.60mmol/(m2·s)). The mean value of F_o_3 was (32.52±7.87) nmol/(m2·s), while that of G_o_3 was (92.04±8.18) mmol/(m2·s) in different tree shape levels. The effects of Rs, VPD and t on G_o_3 and F_o_3 were in an order of dominant tree > depressed tree > middle tree. Peak concentrations of ozone lagged behind the peak value of sap flow density, and over-high ozone concentration would inhibit transpiration. There was a good consistency between the changes of atmospheric ozone concentration and sap flow density, and sap flow technique is suitable for the calculation of ozone uptake of plants.

       

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