文献类型：期刊文献

中文题名：城市绿地系统内外CO_2浓度、δ^(13)C、δ^(18)O差异和来源及影响因素

英文题名：Differences and sources of CO_2 concentration,carbon and oxygen stable isotope composition between inside and outside of a green space system and influencing factors in an urban area

作者：孙守家[1,2] 孟平[1,2] 张劲松[1,2] 舒健骅[3] 郑宁[1,2]

第一作者：孙守家

机构：[1]中国林业科学研究院林业研究所/国家林业局林木培育重点实验室;[2]南京林业大学南方现代林业协同创新中心;[3]北京市园林科学研究院/绿化植物育种北京市重点实验室

年份：2015

卷号：26

期号：10

起止页码：3000-3010

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金：北京市自然科学基金项目(8132044);南京林业大学南方现代林业协同创新中心项目资助

语种：中文

中文关键词：城市绿地系统;稳定同位素;CO2浓度;车流量;来源

外文关键词：urban green space system; stable isotope; CO2concentration; traffic volume; source

分类号：Q149

摘要：采用离轴积分腔输出光谱技术测定夏季和冬季北京市4环路和北京园林科学研究院绿地系统空气中CO2浓度、δ13C和δ18O值,在半小时尺度上分析了其变化特征和差异以及与车流量和气象因子的关联.结果表明:4环路上车流量较大,夏季和冬季观测期间每日均超过15万辆次,有明显的早晚交通高峰.4环路与绿地系统的空气中CO2浓度呈双峰曲线日变化,δ13C值呈双波谷曲线、δ18O值呈单波谷曲线日变化,夏季二者空气中的CO2浓度、δ13C和δ18O差值远大于冬季.同位素定量区分结果显示,夏季观测期间4环路空气中CO2主要来源于机动车尾气,约占64.9%,而绿地系统空气中CO2主要来源于自养和异养呼吸,约占56.3%,冬季观测期间二者空气中CO2均主要来源于机动车尾气.逐步回归分析表明,在半小时尺度上车流量和太阳辐射对绿地系统与4环路CO2浓度差值产生显著影响,太阳辐射和相对湿度则是影响δ13C和δ18O差值的主要气象因子.绿地系统中的植物在生长季节通过光合作用吸收和消减化石燃料燃烧产生的CO2来维持城市碳氧平衡,在改善城市生态环境方面发挥重要作用.
The off-axis integrated cavity output spectroscopy technique was used to measure air CO2 concentration,stable carbon（ δ13C） and oxygen（ δ18O） isotope ratios on the Fourth Ring Road（ FRR） and in the green space system of Beijing Institute of Landscape Architecture（ BILA） in summer and winter seasons. The variations of CO2 concentration,δ13C value,δ18O value and the differences of them between the FRR and the BILA,which were correlated with traffic volume and meteorological factors,were analyzed at half-hour timescale. The results showed that traffic volume on the FRR was large both in summer and winter with obvious morning and evening rush hours,and more than 150 thousands vehicles were observed everyday during the observation periods. Diurnal variation of the CO2 concentration showed a two-peak curve both on the FRR and in the green space system of the BILA. In contrast,diurnal variation of δ13C value was a two-trough curve while diurnal variation of δ18O value was a single-trough curve. The differences of CO2 concentration,δ13C value and δ18O value between the FRR and the green space system of BILA in summer were greater than those in winter. The carbon isotope partitioning results showed that in summer vehicle exhaust contributed 64. 9% to total atmospheric CO2 of the FRR during measurement time,while heterotrophic respiration contributed 56. 3% to total atmospheric CO2 of the green space system in BILA.Howe-ver,in winter atmospheric CO2 from both the FRR and green space system mostly came from vehicle exhaust. Stepwise regression analysis indicated that differences of CO2 concentration between the FRR and green space system were significantly related to vehicle volume and solar radiation at half-hour timescale,while solar radiation and relative humidity were the main meteorological factors causing δ13C and δ18O differences between the FRR and green space system. Plants in the green space system strongly assimilated CO2 from fossil fuel burning by photosynthesis to maintain carbon and oxygen balance of urban area in the growing season,which played an important role in improving urban ecological environment.