摘要
为了解6类典型城市绿地植被群落的凋落物存留特征对绿地土壤理化性质的影响,选取无锡鼋头渚园内典型植被群落为研究对象,开展了城市绿地植被群落凋落物存留特征及其对土壤理化性质的影响的研究。研究发现,乔木-灌木-地被、乔木-草坪、乔木-地被和乔木-灌木-草坪4类群落年凋落物量显著(P<0.05)高于灌木-地被和灌木-草坪两类群落;下层为地被的3类群落的凋落物现存量、土壤总孔隙度、非毛管孔隙度、土壤有机质含量、全氮含量和水解氮含量均显著(P<0.05)高于下层为草坪的3类群落;下层为地被的3类群落的土壤容重显著(P<0.05)低于下层为草坪的3类群落;6类群落间的土壤毛管孔隙度、pH值和全磷部分有显著差异,群落间的全钾和速效钾含量均无显著差异。各群落年凋落物量与土壤理化性质的各项指标(0~10 cm)均没有相关性。凋落物现存量与土壤理化性质关系密切,与土壤容重呈极显著(P<0.01)负相关,与pH值呈显著(P<0.05)负相关,与土壤总孔隙度、非毛管孔隙度、有机质含量、全氮含量和水解氮含量呈极显著(P<0.01)正相关,与速效钾呈显著(P<0.05)正相关,与毛管孔隙度、全磷和全钾没有相关性。相关性分析表明,城市绿地地表覆盖的凋落物能直接或间接改善土壤的理化性能,提高土壤持水能力和透气性能;增加土壤有机质和氮素含量,改善土壤的酸碱度。
This study was carried out to investigate the impact of two litter remaining characteristics of six typical vegetation communities in urban green spaces on the physicochemical properties of the soil.Typical vegetation communities in Yuantouzhu Park were selected as the research area,and the litter amounts of those vegetation communities in the urban green spaces and their responses to the soil physicochemical properties were studied.The results showed that the annual litter amounts of the tree-shrub-ground cover,tree-lawn,tree-ground cover,and tree-shrub-lawn communities were significantly higher(P<0.05)than those of the shrub-ground cover and shrub-lawn communities.The litter standing stock,total soil porosity,non-capillary porosity,and soil organic matter,total N,and hydrolyzed N contents of the coverage from the tree-shrub-ground cover,tree-ground cover,and shrub-ground cover communities were all significantly higher than those of the coverage from the tree-shrub-lawn,tree-lawn,and shrub-lawn communities.Soil bulk density of tree-shrub-ground cover,tree-ground cover,and shrub-ground cover communities were all significantly lower than it of tree-shrub-lawn,tree-lawn,and shrub-lawn communities.Although there were some significant differences in the soil capillary porosity,pH value,and total P content among the six communities,there were no differences in the total K and available K contents.According to the correlation analysis,the annual litter in the communities had no correlation with the indicators of the physicochemical properties of soil at 0-10 cm.By contrast,the litter standing stock was closely related to the soil physicochemical properties;that is,its value was significantly negatively correlated with the soil bulk density(P<0.01)and pH value(P<0.05)and significantly positively correlated with the total soil porosity,non-capillary porosity,soil organic matter,total N content,hydrolyzed N value(P<0.01),and available K content(P<0.05)and had no correlation with the soil capillary porosity and total P and total K contents.These results indicated that litter on the surface cover of urban green spaces can directly or indirectly improve the soil physicochemical properties as well as the soil water holding capacity and permeability.Increasing soil organic matter and N contents can also improve the soil pH value.
作者
章志琴
李燕燕
王宛茜
徐美娟
庞征
ZHANG Zhiqin;LI Yanyan;WANG Wanqian;XU Meijuan;PANG Zheng(Wuxi Environmental Science and Engineering Research Center,Wuxi,Jiangsu 214153,China;Wuxi City College of Vocational Technology,Wuxi,Jiangsu 214153,China;School of Hydraulic and Ecological Engineering,Nanchang Institute of Technology,Nanchang,Jiangxi 330099,China)
出处
《森林与环境学报》
CSCD
北大核心
2021年第2期132-139,共8页
Journal of Forest and Environment
基金
江西省教育厅科技项目“退化红壤区植被恢复对土壤有机碳积累与物理调控机制研究”(GJJ170977)
2020年度无锡城市职业技术学院科研重点项目“城市绿地凋落物存留特征及其养分循环机制研究”(WXCY-2020-KZ-01)
2020年度无锡城市职业技术学院“青蓝工程”项目资助。
关键词
绿地群落
凋落物量
凋落物现存量
土壤理化性质
green vegetation communities
litter quantity
litter standing stock
soil physicochemical properties
