低碳视角下西北地区城市绿地的适水种植设计途径

Approaches to Water-Adapted Planting Design of Urban Green Spaces in Northwest China from the Perspective of Low Carbon

在水资源稀缺的中国西北地区,通过增大城市绿化建设规模应对气候变化可能会导致水资源与能源的双重消耗并加剧碳排放,亟待探索缓解绿化种植耗水及其碳排放问题的可持续设计途径。遵循西北地区城市环境中水与植物这对生态因子耦合的内在机制,以提高城市绿地植物与水因子的适配性为出发点,提出以非传统水源、低碳排水源为绿地用水基础的“生境集水+适水种植”的低影响设计模式;从场地生境优化集水、适水性种植设计和节水型精准灌溉3个方面提出以实现植被耗水需求与低人工干预下土壤水分供给最大程度匹配为目标的适水种植设计途径,并以实践案例进行论证,旨在为开展科学化的城市绿地种植设计提供技术支持,对城市绿地低碳可持续设计具有实践指导意义。

In the Northwest China,where water resources are scarce,scaling up urban greening to address climate change may lead to the consumption of water resources and energy,and increase carbon emissions.It is urgent to explore the pathways to sustainable design for solving water consumption and carbon emissions caused by urban greening.Following the internal mechanism of the coupling ecological factors of water and plants in the urban environment in the Northwest China,a low-impact design model of"habitat-based water harvesting+water-adapted planting"is proposed,which uses non-traditional water sources and low-carbon drainage sources to urban greening water,in order to improve the suitability of plant factor to water factor in urban green space.From the three aspects of optimized habitat-based water harvesting,water-adapted planting design and precision water-saving irrigation,an approach to water-suitable planting design is proposed to achieve the maximum match between vegetation's water consumption demand and soil water supply under low artificial intervention,which is demonstrated with a case.This study is aimed to provide technical support for science-based planting design of urban green space,which is of practical significance for the sustainable low-carbon design of urban green space.