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采集珠江三角洲平原20个农田不同发生层的土壤样品,研究了土壤有机碳(SOC)及其组分,包括高锰酸钾氧化碳(POXC)、不同浓度硫酸氧化的有机碳组分(CF1、CF2、CF3和CF4)、胡敏酸碳(HAC)、富里酸碳(FAC)和胡敏素碳(HMC)的分布特征及其相互关系和影响因素。结果表明:SOC含量变幅为1.88~52.78 g kg~(-1)。SOC、CF1、CF2、CF3、POXC、FAC、HAC含量均在耕作层(Ap1)中最高,平均值分别为17.87、7.29、4.32、2.57、0.58、1.72、2.60 g kg~(-1),在水耕氧化还原层(Br)中最低;CF4和HMC含量在Bg层土壤中最高,平均值分别为5.32、15.03 g kg~(-1)。Ap1、Ap2、Br、Bg层中POXC占有机碳比例平均值分别为3.2%、3.3%、3.5%、3.6%,活性有机碳(CF1+CF2)是土壤有机碳的主要组分,在各发生层土壤中所占比例均>60%。土壤腐殖质以HMC为主,所占比例约80%。土壤有机碳及其各组分之间均呈极显著正相关,土壤有机碳及其组分与土壤全氮、碱解氮呈极显著正相关,与pH值呈显著负相关。
Soil samples collected from 20 farmlands in the Pearl River Delta plain were collected to study soil organic carbon (SOC) and its components, including potassium permanganate (POXC), organic carbon fractions (CF1, CF2, CF3 and CF4), humic acid carbon (HAC), fulvic acid carbon (FAC) and humin carbon (HMC), and their correlation and influence factors. The results showed that the SOC content ranged from 1.88 to 52.78 g kg -1. The contents of SOC, CF1, CF2, CF3, POXC, FAC and HAC in tillage layer (Ap1) were the highest with the average values of 17.87, 7.29, 4.32, 2.57, 0.58, 1.72 and 2.60 g kg ~ The content of CF4 and HMC in the Bg soil was the highest, with the average values of 5.32 and 15.03 g kg ~ (-1), respectively. The average proportion of POXC organic carbon in Ap1, Ap2, Br and Bg layers was 3.2%, 3.3%, 3.5% and 3.6%, respectively. The active organic carbon (CF1 + CF2) was the main component of soil organic carbon The proportion of soil layers are> 60%. Soil humus HMC-based, accounting for about 80%. There was a significant positive correlation between soil organic carbon and its components. There was a significant positive correlation between soil organic carbon and its components and soil total nitrogen and available nitrogen, and a significant negative correlation with soil organic carbon.