城市和郊区麻栎林土壤有机碳组分及管理指数变化特征  

Variation characteristics of soil organic carbon composition and management index of Quercus acutissima forests in urban and suburban areas

作　　者：许慧 BUI Van Thang 范洪旺 许克福[1] 陶晓[1] 徐小牛[1] XU Hui;BUI Van Thang;FAN Hong-wang;XU Ke-fu;TAO Xiao;XU Xiao-niu(School of Forestry&Landscape Architecture,Anhui Agricultural University,Hefei 230036,China)

机构地区：[1]安徽农业大学林学与园林学院,安徽合肥230036

出　　处：《江苏农业学报》2022年第2期369-376,共8页Jiangsu Journal of Agricultural Sciences

基　　金：国家自然科学基金项目(31700631、31070588)。

摘　　要：为了解城郊差异背景下森林土壤有机碳及其组分、碳库管理指数差异,揭示城郊差异对森林土壤活性有机碳含量及其稳定性的影响机制,于2017年7月至2018年3月对安徽省合肥市城市蜀山国家森林公园与郊区紫蓬山国家森林公园麻栎(Quercus acutissima)林土壤进行分季节采样,系统比较城市和郊区森林土壤总有机碳(SOC)含量及活性有机碳组分[易氧化碳(EOC)、颗粒有机碳(POC)]含量、全氮(TN)含量季节动态特征及碳库管理指数变化特征。结果显示,城区森林土壤SOC、TN、EOC、POC含量明显高于郊区森林土壤,且0~10 cm土层含量显著大于0~20 cm土层(P<0.05),在0~10 cm土层,城市森林土壤SOC、TN含量分别是郊区的1.67、1.45倍,10~20 cm土层城市森林土壤SOC、TN含量分别是郊区的1.95、1.68倍。EOC占SOC的比例表现为郊区大于城市,POC占SOC的比例表现为城市大于郊区;蜀山森林土壤EOC、POC含量有显著的季节变化(P<0.05),表现为夏季高,春秋低;土层深度及季节的交互作用对EOC、POC含量无显著影响;土壤TN、SOC和EOC、POC含量两两之间呈极显著(P<0.001)相关;与城市森林相比,郊区土壤碳氮比(C/N)较低;城市森林土壤碳库活度(A)低于郊区,土壤碳库指数(CPI)高于郊区。在本研究区域,城市森林土壤储存了较多的碳,碳库相对稳定,具有较强的固碳潜力。To understand the differences of soil organic carbon and related components,carbon pool management indices of forests under different backgrounds of urban and suburban,and to reveal the influence of urban-suburban differences on the content and stability of soil active organic carbon in the forests,soil samples of Quercus acutissima forests were collected seasonally from July 2017 to March 2018 in Shushan National Forest Park(urban)and Zipengshan National Forest Park(suburban)in Hefei City of Anhui province.The seasonal dynamic characteristics of soil organic carbon(SOC)content and active organic carbon components containing easily oxidized carbon(EOC)and particulate organic carbon(POC)were systematically compared,and variation characteristics of total nitrogen(TN)content and carbon pool management index(CMI)between the two sites were also compared.The results showed that,contents of SOC,TN,EOC and POC in soils of urban forest were obviously higher than in suburban forest,and the contents in 0-10 cm soil layer were significantly higher than in 0-20 cm soil layer(P<0.05).In 0-10 cm soil layer,SOC and TN contents in urban forest soil were 1.67 times and 1.45 times of those in suburban forest soil respectively,while in 10-20 cm soil layer,SOC and TN contents were 1.95 times and 1.68 times of those in suburban forest soil respectively.The ratio of EOC to SOC was higher in suburban forest soil than in urban forest soil,and the ratio of POC to SOC was higher in urban forest soil than in suburb forest soil.The contents of EOC and POC showed significant seasonal variation in the soil of Shushan National Forest Park(P<0.05),which were higher in summer and lower in spring and autumn.The interaction of soil depth and season had no significant effect on EOC and POC contents.There existed extremely significant relationships between TN content,SOC content and EOC content,POC content(P<0.001).The ratio of C to N(C/N)in suburban forest soil was lower compared with that in urban forest soil.The activity of soil carbon pool(A)was

关 键 词：城市化 麻栎林 土壤有机碳 颗粒有机碳 易氧化碳 碳库管理指数 

分 类 号：S714[农业科学—林学]