摘要
为了解南京老山土壤活性有机碳的分布特征及其影响因素,采集老山阳坡和阴坡不同土层(0~10、10~20、20~30 cm)的土壤样品,测定土壤样品中总有机碳(TOC)、可溶性有机碳(DOC)、易氧化有机碳(EOC)和颗粒有机碳(POC)的含量并分析土壤活性有机碳含量与土壤理化性质之间的相关性,探讨造成土壤活性有机碳分布差异的影响因素。结果表明:阴坡的TOC、DOC、EOC、POC含量普遍高于阳坡,但是差异不显著(P>0.05);土壤TOC、EOC、POC含量随着土层深度的增加而降低,其在0~10 cm土层的含量显著高于10~20 cm和20~30 cm土层(P<0.05)。在土壤总有机碳中,各活性有机碳组分的含量表现为POC>DOC>EOC,表明POC是南京老山土壤活性有机碳库的主要碳库。Pearson相关分析结果表明,阳坡和阴坡的土壤密度、土壤容重、全氮含量、碱解氮含量、全磷含量和速效磷含量均与土壤TOC、POC含量呈显著相关(P<0.05)。坡向、土层和土壤理化性质是影响土壤活性有机碳含量的重要因素,坡向和土层改变了土壤活性有机碳的分布,阴坡土壤活性有机碳含量占TOC含量的比例高于阳坡,对土壤碳库的稳定性具有积极影响。
The aim of this study was to understand the distribution characteristics of and factors influencing soil active organic carbon(SOC)in Laoshan,Nanjing.Soil samples from different soil layers(0-10 cm,10-20 cm,and 20-30 cm)were collected from sunny and shady slopes in Laoshan,Nanjing.The total organic carbon(TOC),soluble organic carbon(DOC),easily oxidized organic carbon(EOC),and particulate organic carbon(POC)contents in the soil samples were studied.The results showed that the TOC,DOC,EOC,and POC contents on the shady slopes were generally higher than those on the sunny slopes,but there was no significant difference(P>0.05).The TOC,EOC,and POC in the 0-10 cm soil layer were significantly higher than those in the 10-20 cm and 20-30 cm soil layers(P<0.05).The proportion of each soil active organic carbon component in soil organic carbon was POC>DOC>EOC,which indicated that POC is the main carbon pool in the soil active organic carbon pool in Laoshan,Nanjing.The Pearson correlation indicated that soil density,soil bulk density,total nitrogen,alkaline-hydrolyzable nitrogen,total phosphorus,and available phosphorus were significantly correlated with TOC and POC contents in sunny and shady slopes(P<0.05).We concluded that slope aspect,soil layer,and soil physical and chemical properties are important factors affecting the content of soil active organic carbon.The aspect and soil layers changed the distribution of active organic carbon.The ratio of active organic carbon content to TOC on shady slopes was higher than that on sunny slopes,which positively affected the stability of the soil carbon pool.
作者
鲁惠明
李仁英
刘雨霏
李绍通
杜鸿萱
王孙雨
LU Huiming;LI Renying;LIU Yufei;LI Shaotong;DU Hongxuan;WANG Sunyu(College of Resource and Environment,Anhui Science and Technology University,Fengyang,Anhui 233100,China;School of Ecology and Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing,Jiangsu 210044,China)
出处
《森林与环境学报》
北大核心
2025年第1期43-52,共10页
Journal of Forest and Environment
基金
2023年江苏省碳达峰碳中和科技创新专项资金项目“旱作农田土壤高效固碳减排关键技术创新与应用”(BE2023398)。
关键词
土壤有机碳
活性碳组分
坡向
南京老山
可溶性有机碳
易氧化有机碳
颗粒有机碳
soil organic carbon
active carbon components
slope aspect
Nanjing Laoshan
soluble organic carbon(DOC)
easily oxidized organic carbon(EOC)
particulate organic carbon(POC)
作者简介
第一作者:鲁惠明(1997-),女,硕士研究生,从事农业环境治理研究。Email:huimingluczy@163.com;通讯作者:李仁英(1975-),女,教授,从事农业环境治理研究。Email:ryli75@163.com。
