中国农业科学2013，Vol.46Issue(5)：970-977,8.DOI:10.3864/j.issn.0578-1752.2013.05.012
黑土团聚体与颗粒中碳、氮含量及腐殖质组成的比较
Comparison of Carbon, Nitrogen Contents and Humus Compositions in the Aggregates and Particles of Black Soil
摘要
Abstract
[Objective] The objective of this study was to research the contents of carbon,nitrogen and humus composition in different aggregates and particle-size fractions of black soil,to analyze and compare the relationship of humus in the soil aggregate and particle-size fractions.[Method] The research platform was an 9-years field experiment carried out in black soil region,and soil aggregates and particles were separated by wet sieving and ultrasonic method,respectively.The contents of total C,N,the composition of humic substance (HS) in soil aggregates and particle-size fractions,were investigated respectively.[Result] The contents of C,N,humic acid (HA),fulvic acid (FA),iron-combined humin (Hi) and cly-combined humin (Hc) were much lower in ＞53 μm particle-size fractions than those in ＜53 μm particle-size fractions while the contents of C,N,HA,FA,Hi and Hc in ＞53 μm aggregates were at the same level as those in ＜ 53 μm aggregates.Therefore,the process of aggregation reduced the difference of humic substance in different particle-size fractions.Compared the aggregates with particle-size fractions at the same size,the aggregates contained more humic substance in ＞53 μtm fractions than particle-size fractions,in addition,the PQ and humification degree of HS in aggregates were higher than that in particle-size fractions.In ＜53 μm fractions,however,the contents of humic substance and PQ in aggregates and in particle-size fractions were at the same level.This shows that for ＞53 μm fractions,the differences of humic substance in aggregates and particle-size fractions increased because ＞53 μm aggregates contained small particle-size fractions.[Conclusion] The regularity of C,N contents and quantities of humic substance in soil aggregates with different diameters were quite different from that in particle-size fractions.The differences of humus content and humification degree in particles will be weakened during the process of aggregating.关键词
黑土/团聚体/颗粒/腐殖质组成/胡敏素组成/腐殖质形成Key words
black soil/ aggregate/ particle-size fractions/ humus composition/ humin composition/ humification引用本文复制引用
窦森,郝翔翔..黑土团聚体与颗粒中碳、氮含量及腐殖质组成的比较[J].中国农业科学,2013,46(5):970-977,8.基金项目
国家"973"项目(2011CB100503) （2011CB100503）
