典型黑土的黑度与土壤有机质组分关系研究  

Study on the Relationship Between Blackness and Soil Organic Matter Fractions of Typical Mollisol

作　　者：郝翔翔[1] 王翠 邹文秀[1] 严君[1] 韩晓增[1] HAO Xiangxiang;WANG Cui;ZOU Wenxiu;YAN Jun;HAN Xiaozeng(National Field Observation and Research Station of Hailun Agroecosystems,Key Laboratory of Mollisols Agroecology,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Harbin 150081,China;School of Information Engineering,Harbin University,Harbin 150086,China)

机构地区：[1]中国科学院东北地理与农业生态研究所,海伦农田生态系统国家野外科学观测研究站,黑土区农业生态重点实验室,哈尔滨150081 [2]哈尔滨学院信息工程学院,哈尔滨150086

出　　处：《土壤学报》2023年第5期1421-1429,共9页Acta Pedologica Sinica

基　　金：国家重点研发计划项目(2021YFD1500400、2022YFD1500100);中国科学院战略性先导科技专项(A类)(XDA28070100);财政部和农业农村部国家现代农业产业技术体系(CARS-04)共同资助。

摘　　要：土壤颜色作为土壤的一项重要物理指标,被广泛应用于土壤诊断、分类以及土壤性质判断。在矿物成分大致相同条件下,土壤有机质(SOM)是控制土壤变黑的重要因素。采用基于CIE L*a*b*颜色分析系统的分光测色仪,并结合土壤物理分组方法,对30个典型黑土及其物理组分(轻组、粗颗粒、细颗粒和矿质结合态有机质)的黑度进行了分析,旨在明确黑土SOM含量与其黑度间的定量关系,揭示不同物理组分对土壤黑度的贡献。结果表明:黑土的黑度与SOM、以及各物理组分的黑度与相应组分的有机碳含量之间,均呈显著正相关关系。而且随着组分稳定程度的增加,这种相关性逐渐增强。从不同组分看,轻组和粗颗粒组分的黑度值大于细颗粒和矿质结合态组分,但相关分析表明,轻组和粗颗粒组分的黑度与原土黑度无显著相关关系,二者对土壤黑度的贡献率仅为2.6%。而矿质结合态组分作为土壤腐殖质的主要储存位置,其对土壤的黑度贡献率达81%以上,是黑土呈现黑色的决定性因素。【Objective】Soil color is an important soil property.It is frequently used by soil scientists for the identification and classification of soil.It is also used as an indicator of many soil properties.Soil organic matter(SOM)is the most important pigment,that colors the soil in black color.【Method】In this study,a total of 30 mollisol samples were collected from the typical black soil region of northeast China.The SOM was physically separated into four fractions:light fraction,coarse particle fraction,fine particle fraction,and mineral‐associated fraction.Based on the CIE L*a*b*color analysis system,the darkness of bulk soil and soil physical fractions were analyzed using a spectro-colorimeter.The objective was to quantify the relationships between SOM content and the color of black soil and to reveal the contribution of different physical fractions to soil blackness.【Result】Bulk soil blackness was strongly positively correlated with the SOM content.Similarly,significant relationships were observed between the blackness of physical fractions and the organic carbon content in corresponding fractions.This relationship was gradually strengthened with the increase in the stability of the fractions.As for the color of soil physical fractions,the blackness value of light and coarse particle fractions was greater than that of fine particle and mineral associated fractions.Also,‐correlation analysis showed that there was no significant relationship between the blackness of light or coarse particle fractions and the bulk soil blackness,and the contribution rate of the two fractions to bulk soil blackness was only 2.6%.【Conclusion】The the mineral‐associated fractions,as the main storage location of soil humus,contributed more than 81%to bulk soil blackness and plays a decisive role in coloring the soil black.

关 键 词：土壤颜色 土壤有机碳 亮度值 物理分组 黑土 

分 类 号：S714.5[农业科学—林学]