苏南地区常见公路绿化树种光合固碳特征研究

The photosynthetic carbon fixation characteristics of common tree species for highway greening in southern Jiangsu

本文以苏南地区常见的30种公路绿化树种为研究材料,利用Li-6400便携式光合测定仪,测定不同光强梯度下光合作用的光响应特性及树木光合日变化,对30个树种的日净固碳量和光合生理拟合参数进行聚类分析和因子分析.结果表明:香樟的固碳量最大((11.957±1.053)g·m-2·d-1),其次为碧桃、紫薇、无患子、杨树、竹子、广玉兰、朴树,固碳量最小的为紫叶李((3.888±0.204)g·m-2·d-1),香樟和紫叶李的日净固碳量有极显著差异(P<0.01);无患子、洒金珊瑚、银杏在苏南地区生长适应性较好,其次为香樟、木槿、碧桃等;建议在苏南地区公路碳汇林建设中可以优先选用香樟、碧桃、紫薇、朴树、无患子、竹子、桂花、榆树、梅花、腊梅这10个树种.

In this paper, thirty common highway afforestation tree species in southern Jiangsu province were selected as the research materials, and a portable Li6400 photosynthesis apparatus is used to measure the responses of photosynthesis to different light intensities and the photosynthetic diurnal variation, furthermore, cluster analysis and factor analysis were used to analyze the daily net carbon sequestration and examine the fitting physiological parameters of photosynthesis of thirty tree species. The results showed that Cinnamonum campora has the highest carbon fixation （（11.957±1.053）g·m^-2·d^-1 ）, followed by Prunus persica Batsch. var. duplex Rehd., Lagerstroemia indica, Sapindus mukorossi,Populus euramevicana,Bambusa multiplex,Magnolia grandiflora, and Celtis sinensis, and Prunus cerasifera var. atropurea has the lowest carbon fixation （（3.888±0.204）g·m^-2·d^-1）.The daily net carbon of sequestration Cinnamonum campora and Prunus cerasifera var. atropurea has extremely significant difference （P〈0.01）. Sapindus mukorossi,Aucuba japonica and Ginkgo biloba have better growth and adaptability in southern Jiangsu, followed by Cinnamonum campora,Hibiscus syriacus,Prunus persica Batsch. var. duplex Rehd. and et al. so we suggested that Cinnamonum campora,Prunus persica Batsch. var. duplex Rehd., Lagerstroemia indica,Celtis sinensis,Sapindus mukorossi,Bambusa multiplex,Osmanthus fragrans,Ulmus pumila,Armeniaca mume, and Chimonanthus praecox can be preferred in as priority selection are recommended for road carbon sink forests construction in southern Jiangsu.