人类管理行为对园林绿地碳平衡影响的生命周期研究

With the rapid development of global urbanization, greenspace the only can be self-regulating ecosystems in the urban ecosystems that plays an important role in the ecological balance, especially in the carbon balance. However, human factors and its impact have not been fully considered in current study of the greenspace ecosystem functions. Maintenance management will promote the growth of garden plants, as well as producing more ecological services, while increasing the negative impact of carbon emission due to energy input, which can’t be neglected and need trade-offs. The project will compare the plant carbon sequestration with carbon input of maintenance management through field experiments and surveys on the basis of previous studies, and analyze whether the bioenergy produced by garden waste can offset the carbon emissions from energy input of maintenance management with the life cycle methods. Stella will be used in scenario analysis to explore and predict carbon sequestration, including maintenance management and garden waste as bioenergy. The project aims to illustrate the impact of human management on carbon balance of garden green vegetation and provide theoretical support for better management and low-carbon landscape development. In addition, the study will also contribute to the methodology of urban forestry carbon sequestration research.

随着全球城市化的快速发展，园林绿地作为唯一可进行自行调节的城市生态系统，在碳平衡方面发挥重要的生态平衡作用。然而，在当前园林绿地生态系统碳平衡研究中，对人类调控的因素及其影响未有充分的考虑。养护管理可促进园林植物生长，增加碳固定，但养护管理能源投入带来的碳排放也不容忽视，需要进行权衡。本项目拟在申请人前期研究的基础上，基于生命周期法结合样地实验调查分析园林植物养护管理碳输入与植物碳固定，分析利用养护管理（主要是修剪）产生园林废弃物生产生物能源是否能够抵消养护管理能源投入的碳排放，采用Stella模型平台进行人类管理行为对碳平衡影响的情景分析，探讨和预测考虑养护管理和园林废弃物能源利用下的园林绿地的碳平衡。本项目旨在阐明人类管理调控对园林绿地碳平衡的影响，为更有效的园林绿地优化管理发展低碳景观提供理论支持。此外，本研究也将对城市林业碳汇研究的方法论做出贡献。

城市植被是城市生态系统碳循环中的一个重要贮存库。本研究围绕城市绿地植被碳平衡两个核心问题开展相关研究：人为管理行为（不同养护管理的碳输入，废弃物利用等）对于城市绿地碳平衡的影响程度如何？利用园林废弃物生产生物能源替代化石燃料减排是否能够抵消养护管理的化石燃料碳排放？主要结论如下：园林管理养护措施碳排放量中浇水灌溉（约为102kg/m2/yr）最高，其次是修剪草坪（58.8 kg/m2/yr），病虫害防治31.4kg/m2/yr，施肥最低（17.2 kg/m2/yr）。园林废弃物生产生物能源基本可抵消园林管理过程中的碳排放。城市植被废弃物抵消化石燃料具有可行性。