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当前位置: 首页 > 文章 > 华北半湿润地区土壤酸化和有机碳测定方法的比较 土壤通报 2014,45 (4) 863-870
Position: Home > Articles > Comparison of Acidification and Soil Organic Carbon Determination for Semihumid Soils in North China Chinese Journal of Soil Science 2014,45 (4) 863-870

华北半湿润地区土壤酸化和有机碳测定方法的比较

作  者：
王攀磊;秦凤琴;蔡培;孟凡乔;张民
单  位：
山东农业大学资源与环境学院;中国农业大学理学院;中国农业大学资源与环境学院
关键词：
半湿润区;土壤有机碳;土壤酸化;燃烧法;湿氧化法
摘  要：
土壤无机碳去除是土壤有机碳(C)准确定量的前提。研究以华北半湿润区石灰性土壤土壤为对象,采用不同浓度HCl和不同酸化时间对土壤进行处理,并用碳氮元素分析仪法("燃烧法")和Walkley-Black湿氧化法("湿氧化法")测定土壤有机碳。研究结果表明,3 M酸化后的农田土壤有机碳浓度低于0.5 M和1 M。燃烧法测得的土壤有机碳浓度随酸化时间延长无明显变化,而对于湿氧化法,土壤经过12 h酸化后,土壤有机碳浓度开始显著降低。对于0~5 cm土壤,燃烧法测得有机碳结果高于湿氧化法(p<0.05),而对于5~10 cm和10~20 cm土壤有相反的结果。鉴于湿氧化法的低氧化性和土壤中可能存在的Cl-干扰,造成土壤有机碳的低估或高估,燃烧法对于土壤有机碳的准确更为可靠。对于华北半湿润区农田土壤,0.5 M和1 M浓度HCl和2 h的酸化处理能够较彻底的去除土壤中无机碳。
译  名：
Comparison of Acidification and Soil Organic Carbon Determination for Semihumid Soils in North China
作  者：
WANG Pan-lei;QIN Feng-qin;CAI Pei;MENG Fan-qiao;ZHANG Min;College of Resources and Environmental Sciences, China Agricultural University;College of Sciences, China Agricultural University;College of Resources and Environmental Sciences, Shandong Agricultural University;
关键词：
Semihumid region;;Soil organic carbon;;Soil acidification;;Combustion method;;Wet oxidation method
摘  要：
Removing soil inorganic carbon is the prerequisite for precisely determination of soil organic carbon(SOC).We sampled semihumid soils from North China Plain to compare the effects of HCl concentrations and acidification time on SOC, and also the variance of SOC concentrations between CN analyzer and Walkley-Black method(Wet oxidation). The research indicated that arable soil treated by 3 M HCl had lower level of SOC compared with soils treated by 0.5 M and 1 M HCl. There was no significant difference for SOC concentrations determined by CN analyzer among different acidification time. But as for wet oxidation method, it detected lower levels of SOC concentration of soils acidified by 12 h and 48 h than for 2 h and 6 h(P < 0.05). For soils from 0- 5 cm layer, SOC concentrations measured by CN analyzer were significantly higher than wet oxidation(P < 0.05); but as for lower layer soils, the trend reversed. Considering the low oxidation level of wet oxidation and possible Cl-disturbance, CN analyzer had higher accuracy than wet oxidation method for SOC determination. We also suggested that, as for semihumid soils in North China Plain, 0.5 M and 1 M of HCl and 2 h of acidification time could be adopted to completely remove soil inorganic carbon.

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