植物源挥发性有机物对氮沉降响应研究展望  

Research perspective for the effects of nitrogen deposition on biogenic volatile organic compounds

作　　者：黄娟[1] 莫江明[1] 孔国辉[1] 鲁显楷 张炜[1] 

机构地区：[1]中国科学院华南植物园,中国科学院退化生态系统植被恢复与管理重点实验室,广州510650

出　　处：《生态学报》2011年第21期6616-6623,共8页Acta Ecologica Sinica

基　　金：中国科学院华南植物园博士启动基金(200931);广东省环境污染控制与修复技术重点实验室开放研究基金资助项目(2011K0014);973项目(2010CB833502);国家自然科学基金项目(30970521;40730102)

摘　　要：植物排放的挥发性有机物(Biogenic volatile organic compounds,BVOCs),属于植物次生代谢物质,是植物重要的防御物质,亦是全球碳(C)素循环的一个重要组成部分。它们具有很高的化学活性,参与对流层大气化学过程,并对全球变化和碳氮(N)循环等具有潜在的影响。尽管N沉降全球化已严重干扰了生态系统的碳氮循环,并且已威胁到生态系统的健康和安全。然而N沉降对BVOCs影响的研究报道十分缺乏。综述了BVOCs影响因素的基础上,重点论述了N素对BVOCs的影响,提出了N沉降对植物BVOCs影响的趋势模型:在N素不足的系统中,N沉降的增加补充了系统所需的N素,有利于植物的生长,大量BVOCs的排放会受到抑制;在N素丰富或过量的系统中,N沉降导致系统N素过饱和或富营养化,不利于植物的生长,刺激BVOCs的排放增加。此外,还探讨了研究N沉降对BVOCs影响的可行性方法,强调开展我国N沉降对BVOCs的影响研究的重要性和紧迫性。为我国开展N沉降对BVOCs的影响研究以及加深了解生态系统CN循环及其藕合提供参考。Biogenic volatile organic compounds（BVOCs） are volatile hydrocarbons emitted by plants with boiling point in the range of 50—260℃ and saturated vapor pressure at room temperature beyond 133.322 Pa.Because these compounds have high reactive activities and participate in atmospheric chemistry process of troposphere,they potentially affect atmospheric environmental quality,global change and the cycling of carbon（C） and nitrogen（N）.BVOCs belong to plant secondary metabolites and are considered to be plant defensive matters.Some species among BVOCs even take important ecological roles,such as resisting environmental changes,stresses and mechanical injuries,being transferred as signals among plants or between plants and insects.As a result,the functions of BVOCs and the relationship between BVOCs and global change are increasingly concerned.Nowadays,N deposition is globalizing and has become one of the new global change phenomena,and is projected to increase rapidly with development of industry,agriculture and urbanization.Elevated N deposition has been known to seriously disturb the pattern of ecosystem C and N cycles,threat the ecosystem health and services,such as inducing forest soil acidification,reducing forest plant biodiversity,ecosystem N saturation,and so on.Increasing N deposition,as a new environmental factor,is stealthily and rapidly affecting BVOCs emission rates and species,and their functions in ecosystems.However,there have been so far few reports related to the effects of N deposition on BVOCs.In this paper,based on the available information from the literature,we firstly reviewed the affecting factors of BVOCs,secondly discussed the effects of N availability on BVOCs,and then proposed a model of possible impacts of N deposition on BVOCs.The proposed model showed that,in an N-deficient ecosystem,if N deposition offseted N deficiency and favored plant growth,huge BVOCs release would be happened;while in an N-enriched ecosystem,if N deposition accelerated N saturation or N eutrophication

关 键 词：BVOCs N沉降 CN循环 全球变化 

分 类 号：X13[环境科学与工程—环境科学]