30种平原绿化乔木树种光合固碳特性分析

Photosynthesis and Carbon Sequestration Characteristics of Thirty Afforestation Arbor Species in Plain Area

以浙北地区常见的30种平原绿化树种为试材,用Li-6400便携式光合测定仪对其光合日变化及不同光强梯度下光合作用响应进行测定,并对树木净光合速率日变化曲线、固碳释氧能力、光响应曲线及各种光合生理拟合参数进行分析。结果表明:各树种碳素累积主要在上午进行,光合作用能力强的树种同化累积的碳素多;固碳释氧能力最强的是香樟,光合净同化量为323.13 mmol/(m2·d),其次是碧桃、垂柳、石栎,最小的是红叶李;树种光响应曲线及其光合生理指标反应了香樟、垂柳、碧桃、合欢等树种生长适宜性较好。综合分析,浙北地区平原绿化可以优先选择香樟、碧桃、垂柳、合欢、无患子、石栎、三角枫、女贞等固碳能力较强的树种。

Thirty tree species commonly planted for afforestation in the northern plain area of Zhejiang Province were taken as study objects, the diurnal variation in photosynthesis and the photosynthetic response to different light intensity of these tree species were measured with Li -6400 portable photosynthesis device. The diurnal variation curves of the photosynthesis, carbon sequestration and oxygen release capacity, light response curves and photosyn- thetic physiological parameters of the thirty tree species were analyzed. The results showed that carbon accumulation mainly took place in the morning, and more carbon could be accumulated via metabolism by the tree species with carpus glabra, and the least amount of carbon fixation and oxygen release happened to Prunus cerasifera f. atropur- purea （ 61. 864 4 mmol（ m2· s） ）. The light response curves and photosynthetic indexes of Cinnamonum campo- ra, Salix babylonica, Amygdalus persica var. persica, and Albizia julibrissin showed that these tree species hadstronger adaptability to local site conditions. The comprehensive analyses showed that Cinnamonum campora, Amygdalus persiea var. persiea, Salix babyloniea,Albizia julibrissin, Sapindus mukorossi, Lithocarpus glabra, Aeer buergerianum and Ligustrum lucidum should be selected to be planted with priority in the northern plain area of Zhejiang Province for their stronger capacity of carbon sequestration.