摘要
农田生态系统正成为继森林和草原之后第三大生物源挥发性有机物(Biogenic Volatile Organic Compounds,BVOCs)排放源。以内蒙古高原主要农作物[玉米(Zea mays L.)、马铃薯(Solanum tuberosum L.)和水稻(Oryza sativa L.)]为对象,采用动态箱采样结合ATD-GC/MS技术,测定其BVOCs排放特征,并通过G93与G95模型耦合温度、光合有效辐射(PAR)等参数,计算标准状态(T=303 K,PAR=1000μmol∙m^(-2)∙s^(-1))下的排放速率,结果表明:1)3种农作物均排放α−蒎烯、崁烯、β−蒎烯、β−月桂烯、α−水芹烯、3−蒈烯、α−萜品烯、对伞花烃、柠檬烯、γ−萜品烯、萜品油烯(单萜烯)、异戊二烯和苯、甲苯、乙基苯、间二甲苯、对二甲苯、邻二甲苯(BTEX)等18种挥发性有机物;2)玉米的异戊二烯、单萜烯和苯系物排放速率分别为15.8-363、4.36-94.5、46.9-706μg∙g^(-1)∙h^(-1),马铃薯这3种物质的排放速率分别为4.47-26.1、10.3-149、5.76-78.4μg∙g^(-1)∙h^(-1),水稻分别为3.69-12.7、3.52-25.8、1.70-15.1μg∙g^(-1)∙h^(-1);3)玉米的异戊二烯、单萜烯和BTEX在标准状态下的排放速率分别为156、9.49、125μg∙g^(-1)∙h^(-1),马铃薯这3种物质在标准状态下的排放速率分别为16.9、39.6、14.1μg∙g^(-1)∙h^(-1),水稻分别为3.66、4.05、3.41μg∙g^(-1)∙h^(-1)。内蒙古高原主要农作物BVOCs排放速率呈现明显的温度与PAR依赖性及日变化规律。该结果可为研究内蒙古高原BVOCs排放速率对区域环境臭氧浓度的贡献提供科学依据。
Farmland ecosystems are emerging as the third largest source of biogenic volatile organic compound(BVOCs)emissions,following forests and grasslands.Focusing on the main crops of the Inner Mongolian Plateau[corn(Zea mays L.),potato(Solanum tuberosum L.),and rice(Oryza sativa L.)],dynamic chamber sampling combined with ATD-GC/MS technology was employed to determine their BVOCs emission characteristics.By coupling parameters such as temperature and photosynthetically active radiation(PAR)using the G93 and G95 models,the emission rates under standard conditions(T=303 K,PAR=1000μmol·m^(-2)·s^(-1))were calculated.The results showed that:1)all three crops emitted 18 volatile organic compounds,includingα-pinene,camphene,β-pinene,β-myrcene,α-phellandrene,3-carene,α-terpinene,p-cymene,limonene,γ-terpinene,terpinolene(monoterpene),isoprene,and benzene,toluene,ethylbenzene,m-xylene,p-xylene,o-xylene(BTEX).2)the emission rates of isoprene,monoterpene,and BTEX from corn were 15.8-363,4.36-94.5,and 46.9-706μg·g^(-1)·h^(-1),respectively;those from potatoes were 4.47-26.1,10.3-149,and 5.76-78.4µg·g^(-1)·h^(-1),respectively;and those from rice were 3.69-12.7,3.52-25.8,and 1.70-15.1μg·g^(-1)·h^(-1),respectively.3)The emission rates of isoprene,monoterpene,and BTEX from corn under standard conditions were 156,9.49,and 125μg·g^(-1)·h^(-1),respectively.For potatoes,the rates were 16.9,39.6,and 14.1μg·g^(-1)·h^(-1),respectively.For rice,the corresponding values were 3.66,4.05,and 3.41μg·g^(-1)·h^(-1),respectively.The emission rates of BVOCs from major crops on the Inner Mongolian Plateau exhibited significant temperature and PAR dependencies,as well as diurnal variations.This result provides a scientific basis for studying the contribution of BVOC emission rates to regional environmental ozone concentrations on the Inner Mongolian Plateau.
作者
包雪儿
包海
赵玲玲
昂给拉玛
BAO Xueer;BAO Hai;ZHAO Linging;ANG Geiama(College of Chemistry and Environment Science,Inner Mongolia Normal University,Hohhot 010022,P.R.China;Inner Mongolia Industrial Technology Engineering Center of Special Resources Development,Utilization and Ecological Environment Protection,Hohhot 010022,P.R.China)
出处
《生态环境学报》
北大核心
2025年第9期1442-1451,共10页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(22266024)
内蒙古自然科学基金项目(2022MS02003)
2024年大学生创新创业训练计划资金资助项目(S202410135031)。
