摘要
城市地被植物在城市生态系统碳汇过程中是与表层土壤接触面积最广的生态固碳要素。不同地被植物应用形成的景观对单位面积植物生态固碳量具有较大影响。该文通过查阅文献资料、德尔菲专家问卷咨询筛选评价指标,采用序关系分析方法确定各级评价指标权重,建立城市地被植物景观生态碳汇功能评价体系。成功构建了包含3个一级指标、8个二级指标、24个三级指标的城市地被植物碳汇能力评价指标体系。并结合运用K-Means聚类方法将研究的22种城市地被植物碳汇能力分为4个等级,即Ⅰ级(优)、Ⅱ级(良)、Ⅲ级(中等)、Ⅳ级(一般)。结果显示:(1)对城市地被植物碳汇能力产生影响的3个一级指标综合权重由高到低为植物体固碳(0.360)>人为管理干扰因素(0.329)>土壤固碳(0.311);(2)8个二级指标不同类别综合权重由高到低依次为土壤化学性质(0.176)>土壤物理性质(0.159),植物形态特征(0.118)>植物生长特征(0.117)>生物量(0.103)>植物元素含量特征(0.081),扰动植物(0.260)>扰动土壤(0.162);(3)24个三级指标中8种不同分类综合权重比较大的分别是:土壤容重(0.087)、土壤pH值(0.036)、地上生物量(0.052)、根系C/N(0.060)、株高(0.082)、生长周期(0.087)、旋耕(0.087)、割刈留茬(0.088);(4)K-Means聚类方法综合评价22种研究对象城市地被植物碳汇能力为优的第Ⅰ级地被植物品种为画眉草、萱草、金鸡菊、松果菊、鸢尾、鼠尾草、日光菊、拂子茅,碳汇能力为良的第Ⅱ级地被植物品种为假龙头、大花秋葵。
Urban ground cover plants play a crucial role in carbon sequestration within urban ecosystems due to their extensive contact with surface soil.The landscape formed by different ground cover plants has a different influence on the ecological carbon sequestration of plants per unit area.This paper employed a literature review along with consultations from a Delphi expert questionnaire to select evaluation indicators.The order relationship analysis method was utilized to determine the weight of these indicators at various levels.An evaluation index system of the carbon sequestration capacity of urban cover plants was successfully established,which included 3 primary indexes,8 secondary indexes,and 24 tertiary indexes.Combined with the K-Means clustering method,the carbon sequencing capacity of 22 urban ground cover plants in was divided into four levels,namely,grade Ⅰ(excellent),grade Ⅱ(good),grade Ⅲ(medium),and grade Ⅳ(general).The results showed that:(1)The overall weight of the three primary indexes affecting the carbon sequestration capacity of urban ground cover plants was from high to low as plant carbon sequestration(0.360)>human management disturbance(0.329)>soil carbon sequestration(0.311);(2)The overall weights of different categories of 8 secondary indexes in descending order were:soil chemical properties(0.176)>soil physical properties(0.159),plant morphological characteristics(0.118)>plant growth characteristics(0.117)>biomass(0.103)>plant element content characteristics(0.081),disturbed plants(0.260)>disturbance Dynamic soil(0.162);(3)Among the 24 three-level indicators,the comprehensive weights of 8 different categories were as follows:Soil bulk density(0.087),soil pH value(0.036),aboveground biomass(0.052),root C/N(0.060),plant height(0.082),growth cycle(0.087),rotary tillage(0.087),mowing and stubble(0.088);(4)The comprehensive evaluation results of the K-Means clustering method indicated that among the 22 urban groundcover plants studied,the grade Ⅰ species with excellent carbon sequestration abilities included Eragrostis pilosa,Hemerocallis fulva,Coreopsis tinctoria,lris tectorum,Salvia japonica,Heliopsis helianthoides,Calamagrostis epigeios,the grade Ⅱ groundcover species with good carbon sequestration abilities Pnysostegia virginiana,Hibiscus grandiflorus.
作者
陈敬宣
韩博文
曹建伟
杜鑫亮
郑春燕
CHEN Jingxuan;HAN Bowen;CAO Jianwei;DU Xinliang;ZHENG ChunYan(Hutuo River Ecological Zone Mangagement and Protection Center,Shijiazhuang,Hebei 050000,China;Center for Agricultural Resources Research,1GDB,CAS,Shijiazhuang,Hebei 050022,China)
出处
《河北林业科技》
2025年第1期48-52,共5页
Journal of Hebei Forestry Science and Technology
基金
石家庄市科技局引智项目资金(20230042)。
关键词
城市地被植物
碳汇功能
评价体系
ground cove plant
carbon sink function
evaluation system
