南岭箭竹生物源挥发性有机物排放特征

本研究于2018年9~11月采用动态顶空套袋法采样与热脱附-气相色谱质谱联用（TD-GC-MS）分析技术，获得了南岭箭竹排放的20种生物源挥发性有机物（BVOCs）的排放组成特征与排放速率.结果表明，异戊二烯是南岭箭竹排放的最主要的BVOCs，其排放速率（（1.36±0.99）×10⁴μgC/（m²×h））远高于单萜烯（（32.59±35.39）μgC/（m²×h））、倍半萜烯（（2.62±2.91）μgC/（m²×h））等其他物质.与亚洲地区的其他竹类相比，南岭箭竹异戊二烯的排放速率处于中上水平.南岭箭竹排放的BVOCs存在明显的日变化规律，日出后各物质的排放速率逐渐升高，在12：00~13：00左右达到最大值，然后逐渐下降.另外，南岭箭竹异戊二烯排放速率与温度呈显著正相关关系，与光照的相关性较弱.

Emissions of biogenic volatile organic compounds (BVOCs) from fargesia nanlingensi in Nanling mountains,southern China

In this study, we obtained the emission characteristics and emission rates of 20 biogenic volatile organic compounds (BVOCs) of fargesia nanlingensi from September to November 2018, by using a dynamic headspace sampling and thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) analysing technique. The results showed that isoprene was the dominant BVOCs emitted from fargesia nanlingensi, its emission rate ((1.36 ±0.99)×10⁴ μgC/(m²×h)) was significantly higher than those of monoterpenes ((32.59 ±35.39) μgC/(m²×h)), sesquiterpenes ((2.62 ±2.91) μgC/(m²×h)) and other BVOCs. Compared with other bamboo species in Asia, the isoprene emission rate of fargesia nanlingensi was at an upper-middle level. There was an obvious diurnal variation of the BVOCs emitted from fargesia nanlingensi. The BVOCs emission rates gradually rose after sunrise, peaked at 12:00 to 13:00, and then started falling. In addition, the emission rates of isoprene had significant positive correlations with temperature and weak correlations with light.