杨同辉　娄明华　张希金　宋坤

摘要[目的]科学评估宁波市城市森林生态服务价值。[方法]选择3个生境梯度林带中的14个树科，采用干烧法测定分析宁波市主要绿化树种枝、叶的C、N、S含量，分别比较不同树种和不同林带的C、N、S分布特征。[结果]宁波市14个绿化树种枝、叶器官的C、N、S量差异较大，叶片C、N、S元素含量分别为44.77%、1.33%和0.20%，在正常范围内；不同树种叶器官的N含量显著高于枝器官，不同生境枝、叶器官S含量差异显著，N、C含量差异不显著。宁波地区森林主要树种C、N、S元素含量相对稳定，但不同植被区域具有不同的植物元素计量特征。[结论]该研究可为宁波市森林服务价值评估及布局优化提供科学依据。

关键词绿化树种；元素含量；分布特征；宁波市

中图分类号S718.4文献标识码A文章编号0517-6611（2017）31-0173-02

Abstract[Objective]To scientifically evaluate the ecological service value of urban forest in Ningbo. [Method]14 tree species in 3 forest belts were selected， the content of carbon， nitrogen and sulphur in the branches and leaves of main greening tree in Ningbo was measured by combustion method. The distribution characteristics of carbon， nitrogen and sulfur in different tree species and different forest belts were compared. [Result]The results showed that the forteen species had obviously different content of carbon， nitrogen and sulphur in branch and leaf， which were 44.77%， 1.33% and 0.20% respectively，and those were in the normal range；The nitrogen content of leaf organs of different tree species was significantly higher than that of branch organs， the difference of sulphur content of branch organs in different habitats was significant， while the difference of carbon and nitrogen content is not significant. The comparative analysis showed that the content of carbon， nitrogen and sulphur of the main tree species in Ningbo forest was relatively stable， but there was different content of plant elements in different vegetation areas.[Conclusion]The study can provide a scientific basis for the evaluation and layout optimization of forest services in Ningbo.

Key wordsGreen tree species；Element content；Distribution characteristics；Ningbo City

近年来，随着人们对城市森林效益和价值认识的不断提高，全国各地森林城市的规划和建设陆

续展开[1]。宁波市利用自身地理条件和资源优势，逐步构建起以中心城区为主体、辐射周围

城镇的城市森林生态网络，包括城市公园、城市绿地、城镇森林和远郊防护林、森林风景区

等。在增加城市绿量、提升城市森林景观的同时，持续发挥其净化空气、调节小气候、消减噪声等多种生态服务功能。

城市森林是城市生态系统的主体[2]，作为生态系统的重要组成部分，遵循地球各圈层间的生物地球化学循环，尤其是C、N等重要生命物质循环，对于维持地球生命活动具有重

要意义[3]，同时亦是生态化学计量学的重要研究内容。……