鼎湖山天然针阔叶混交林优势树种对大气SO2的气孔吸收特征

doi:10.19741/j.issn.1673-4831.2019.0051

摘要/Abstract

摘要： 利用树干液流技术、二氧化硫（sulfur dioxide，SO₂）测定技术和气象观测手段，同步获取了鼎湖山天然针阔叶混交林群落优势树种水分利用、生物特征、环境SO₂浓度及相关气象因子。根据水汽与痕量气体通过气孔双向交换的耦合关系，定量计算鼎湖山针阔叶混交林中针叶树种马尾松（Pinus massoniana，Pm）及阔叶树种锥栗（Castanopsis chinensis，Cc）、木荷（Schima superba，Ss）、华润楠（Machilus chinensis，Mc）4种优势树种的冠层气孔SO₂导度（G_SO₂）、SO₂吸收通量（F_SO₂）及累积吸收量（F_SO₂，st），并分析其特征。结果表明，在日尺度上，日间SO₂浓度和G_SO₂最大值时间基本重叠，各树种在正午前后出现最大吸收；在季节尺度上，SO₂浓度干季（10-翌年3月）平均浓度为10.11 nL·L^-1，高于湿季（4-9月）的5.45 nL·L^-1。4个树种G_SO₂在湿季显著高于干季（P<0.001），F_SO₂在干季高于湿季（P<0.001）。锥栗和华润楠的F_SO₂，st分别为2.16和2.50 mmol·m^-2，高于马尾松（1.70 mmol·m^-2）和木荷（1.91 mmol·m^-2）。优势树种对大气SO₂的气孔吸收行为主要受水汽压亏缺（vapor pressure deficit，VPD）、光合有效辐射（photosynthetically active radiation，PAR）和SO₂浓度等因素影响。该研究可为评估珠三角地区针阔叶混交林乃至粤港澳大湾区森林的SO₂吸收通量提供参考，为定量计算该地区环境的变化奠定基础。

关键词: 树干液流, 针阔叶混交林, 冠层气孔导度, 二氧化硫, 痕量气体

Abstract: The water use, biological characteristics, concentration of sulfur dioxide (SO₂) and meteorological data were acquired by the sap flow measurements and environmental monitoring techniques. Based on the coupling relationship between water vapor and trace gas through two-dimensional exchange of pores, the canopy stomatal conductance for SO₂ (G_SO₂), canopy SO₂ uptake flux (F_SO₂), and accumulated stomatal SO₂ flux (F_{SO_2,st}) of four dominant tree species (Pinus manssoniana, Castanopsis chinensis, Schima superba, and Machilus chinensis) in a natural mixed conifer-broadleaf forest at Dinghushan, south China were determined. The results show that, on a daily scale, the time at which the maximum concentration of SO₂ appeared was partly overlapped the time when the maximum G_SO₂ occurred, and the maximum absorption of the four dominant tree species occurred at around noon time. On a seasonal scale, the average concentration of SO₂ in the dry season (from October to March) was 10.11 nL·L^-1, which was higher than that in the wet season (from April to September), 5.41 nL·L^-1. The G_SO₂ of the four species was significantly higher in the wet season than that in the dry season (P<0.001), while the F_SO₂ in the wet season was higher than that in the dry season (P<0.001). Furthermore, the F_SO₂,st of C. chinensis and M. chinensis were 2.16 and 2.50 mmol·m^-2, which were higher than 1.70 and of 1.91 mmol·m^-2 for P. massoniana and S. superba, respectively. The SO₂ stomatal absorption behavior of the four dominant tree species was mainly affected by factors such as vapor pressure deficit (VPD), photosynthetically active radiation (PAR) and SO₂ concentration. This research provides the basic data for the reasonable evaluation of SO₂ absorption flux in mixed coniferous-broadleaf forests in the Pearl River Delta region, and provides a basis for risk prevention for environmental assessment.

Key words: sap flow, mixed conifer-broadleaf forest, canopy stomatal conductance, sulfur dioxide, trace gas

中图分类号:

Q148

邓永红, 王立景, 黄健强, 孟泽, 刘世忠, OTIENO Dennis, 李跃林. 鼎湖山天然针阔叶混交林优势树种对大气SO₂的气孔吸收特征[J]. 生态与农村环境学报, 2020, 36(3): 382-389.

DENG Yong-hong, WANG Li-jing, HUANG Jian-qiang, MENG Ze, LIU Shi-zhong, OTIENO Dennis, LI Yue-lin. Sulfur Dioxide Uptake by the Dominant Canopy Tree Species in a Natural Mixed Conifer-broadleaf Forest in Dinghushan, Guangdong Province, South China[J]. Journal of Ecology and Rural Environment, 2020, 36(3): 382-389.

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鼎湖山天然针阔叶混交林优势树种对大气SO₂的气孔吸收特征

Sulfur Dioxide Uptake by the Dominant Canopy Tree Species in a Natural Mixed Conifer-broadleaf Forest in Dinghushan, Guangdong Province, South China

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