摘要
以沈阳市4类植被配置方式24块城市绿地为研究对象,探究城市绿地土壤呼吸速率的时空动态变化规律及其影响因素。结果表明:土壤呼吸速率具有显著的夏季高、冬季低的季节动态规律性,偏相关分析显示,土壤温度与土壤呼吸时间动态变化显著相关。此外,植被配置方式对绿地土壤呼吸速率的影响存在差异:稀乔(5.68μmol·m-2·s-1)>乔草(5.66μmol·m-2·s-1)>乔灌(4.75μmol·m-2·s-1)>乔灌草(3.84μmol·m-2·s-1),稀乔和乔草土壤呼吸显著高于乔灌草配置。空间异质性分析显示,由疏透度导致的地表土壤温度差异,加之土壤有机质等养分条件差异可能是不同植被配置城市绿地土壤呼吸速率出现差异的主要因素。冬季和夏季拟合结果对比显示土壤温度是影响城市绿地碳排放空间异质性的主要因素,因此,如何通过合理的植被配置减少直达地表光照辐射、降低土壤温度是实现城市绿地减排的重要选项。
Basing on 24 urban green spaces of four vegetation configurations in Shenyang,this study aimed to examine the temporal and spatial dynamics of soil respiration and its influencing factors.Results show that soil respiration has obviously seasonal variation patterns.Partial correlation analysis indicates that soil temperature is the vital factor affecting temporal variation of soil respiration.In addition,respiration of four vegetation types are 5.68μmol·m-2·s-1(Sparse trees),5.66μmol·m-2·s-1(Tree-grasses),4.75μmol·m-2·s-1(Tree-shrubs),and 3.84μmol·m-2·s-1(Tree-shrub-grasses),respectively.The soil respiration of Sparse trees and Tree-grasses are significantly higher than that of Tree-shrub-grasses.Spatial heterogeneity analysis shows that the difference of soil temperature caused by the degree of dialysis,combined with the diverse nutrient conditions such as soil organic matter,would be the main factors contributing to the soil respiration rate difference among vegetation configurations.The winter and summer regressions both show that soil temperature is the principle factor affecting the spatial heterogeneity of carbon emission among urban green spaces.Therefore,reasonable vegetation configuration which contributes to the reduction of direct surface illumination and soil temperature,would be an important method to achieve urban green space CO 2 emission reduction.
作者
白洁
范志平
林力涛
李群
孙学凯
马溪平
李丹丹
BAI Jie;FAN Zhi-ping;LIN Li-tao;LI Qun;SUN Xue-kai;MA Xi-ping;LI Dan-dan(College of Environmental Science,Liaoning University,Shenyang 110036,China;Institute of School of Environmental&Safety Engineering,Liaoning Petrochemical University,Fushun 113001,China;Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《气象与环境学报》
2020年第5期105-112,共8页
Journal of Meteorology and Environment
基金
辽宁省自然科学基金(2019-MS-341)
国家自然科学基金(41401262,41977074)
水体污染控制与治理科技重大专项(2018ZX07601-003)共同资助。
关键词
植被配置
空间异质性
土壤温度
Vegetation configuration
Spatial heterogeneity
Soil temperature
