Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

WU Qing-Biao; WANG Xiao-Ke; OUYANG Zhi-Yun

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Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

机译：不同植被类型的土壤有机碳及其组分：土壤矿物表面积和微团聚体的影响

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Soil organic carbon (SOC) can act as a sink or source of atmospheric carbon dioxide;therefore,it is important to understand the amount and composition of SOC in terrestrial ecosystems,the spatial variation in SOC,and the underlying mechanisms that stabilize SOC.In this study,density fractionation and acid hydrolysis were used to assess the spatial variation in SOC,the heavy fraction of organic carbon (HFOC),and the resistant organic carbon (ROC) in soils of the southern Hulun Buir region,northeastern China,and to identify the major factors that contribute to this variation.The results showed that as the contents of clay and silt particles (0-50 μm) increased,both methylene blue (MB) adsorption by soil minerals and microaggregate contents increased in the 0-20 and 20-40 cm soil layers (P＜0.05).Although varying with vegetation types,SOC,HFOC,and ROC contents increased significantly with the content of clay and silt particles,MB adsorption by soil minerals,and microaggregate content (P＜0.05),suggesting that soil texture,the MB adsorption by soil minerals,and microaggregate abundance might be important factors influencing the spatial heterogeneity of carbon contents in soils of the southern Hulun Buir region.

机译：土壤有机碳（SOC）可以充当大气二氧化碳的汇或源;因此，了解陆地生态系统中SOC的数量和组成，SOC的空间变化以及稳定SOC的潜在机制非常重要。本研究利用密度分馏和酸水解法评估了呼伦贝尔南部地区土壤中SOC的空间变化，有机碳的重含量（HFOC）和抗性有机碳（ROC）的空间分布。结果表明，随着黏土和淤泥颗粒（0-50μm）含量的增加，土壤矿物对亚甲基蓝（MB）的吸附和微团聚体含量均在0-20和20之间增加。 20-40 cm土壤层（P ＜0.05）。尽管随植被类型的不同，SOC，HFOC和ROC含量随黏土和淤泥颗粒含量，土壤矿物质对MB的吸附以及微骨料含量的增加而显着增加（P ＜0。 05），表明土壤质地，土壤矿物对MB的吸附以及微骨料的丰度可能是影响呼伦贝尔南部地区土壤碳含量空间异质性的重要因素。

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来源
《土壤圈（英文版）》 |2009年第2期|258-264|共7页
作者
WU Qing-Biao; WANG Xiao-Ke; OUYANG Zhi-Yun;
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作者单位

Forestry College of Guangxi University,Nanning 530004 China;

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085 China;

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085 China;

Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
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Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

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