[Emission Characteristics of Biogenic Volatile Compounds (BVOCs) from Common Greening Tree Species in Northern China and Their Correlations with Photosynthetic Parameters].

In order to understand the emission characteristics of common greening trees in Beijing and analyze their correlations with photosynthetic parameters, including the net photosynthetic rate (), stomatal conductance (), intercellular CO concentration (), and transpiration rate (), we collected samples of biogenic volatile organic compounds (BVOCs) using a dynamic sampling technique from 14 species of deciduous trees. The results showed that there were significant differences in isoprene and total BVOC emissions between family or genus levels (<0.01). With the exception of Maxim and L., all species were found to emit isoprene, monoterpenes, and sesquiterpenes, of which, species from the Salicaceae (e.g., cv. '55/56'× cv. 'Imperial', cv. '74/76' Carr, and ) and Legume ( and Linn. var Hort) families were the higher isoprene emitters, with emission rates that ranged from (30.1±4.3) μg·(g·h) to (91.8±10.0) μg·(g·h). Plants from the Oleaceae (e.g., Roxb and Lindl), Begonia (), Sapindaceae (), and Aceraceae ( Bunge) families mainly emitted monoterpenes and sesquiterpenes. Among them, Roxb and Bunge were the highest emitters with emission rates of (10.6±4.8) μg·(g·h) and (11.8±6.4) μg·(g·h), respectively. Ocimene and -pinene were the two main monoterpenes emitted from greening tree species. No significant correlations were found between the emission of BVOCs and or , while the emission rate of isoprene (=0.681; <0.01) and the total BVOC (=0.698; <0.01) from the Salicaceae family increased with increasing . Moreover, leguminous plants showed a significant positive correlation between the total BVOC emission rate and (=0.04). This study provides a scientific reference for the selection and configuration of urban greenery, and a theoretical basis for exploring the mechanism of BVOC emissions.