ISWC OpenIR  > 水保所知识产出(1956---)
子午岭林区不同 胶结物质 类型 的 土壤 团聚 体 结构 特征
张耀方
Subtype硕士
Thesis Advisor赵世伟
2015-05
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword有机碳及组分 碳酸钙 团聚体 稳定性 孔隙结构
Abstract

由于土壤类型和成土环境的复杂性,团聚体形成过程及机制尚无普适性理论。目
前在团聚体形成过程中,有机碳的作用研究较多,而对无机胶体的研究仍以定性描述
为主,有机碳与碳酸钙的团聚过程及作用主要是以全土或大团聚体为对象,在各粒级
团聚体中的分布及作用仍不清楚。本研究通过测定子午岭林区典型植被群落下土壤剖
面不同深度土层中土壤各粒级团聚体中有机碳和碳酸钙的分布特征,以及在这两种胶
结物质驱动下形成的团聚体粒径分布、稳定性特征、孔隙结构特征,揭示不同胶结特
点下土壤团聚体形成与稳定机制。在已有的研究基础上,更进一步的明确胶结物质对
土壤团聚体形成及稳定过程的作用,可为土壤固碳、水土保持提供理论支持及决策依
据。主要研究结果如下:
1、土壤剖面团聚体有机碳分布特征
土壤有机碳含量均随着剖面加深而逐渐减少,0-10cm 土层有机碳含量均大于
15g.kg
-1 ,10-20cm 土层有机碳含量约 10g.kg -1 ,20cm 以下土层有机碳含量≤5g.kg -1 ;
有机碳主要在 0-20cm 土层团聚体中发挥主要胶结作用。
各粒级团聚体有机碳含量随剖面加深而减少。>5mm 及 0.053-0.25mm 团聚体粒级
有机碳贡献率随剖面的加深而增加,其它粒级团聚体有机碳贡献率随剖面的加深而逐
渐减少。微团聚体有机碳贡献率最高,大团聚体有机碳贡献率随粒径变小而减少。
2、土壤剖面团聚体有机碳组分分布特征
土壤有机碳组分含量均随着剖面加深而逐渐减少。0-10cm 土层颗粒有机碳占主
要组成部分,10-100cm 土层矿物结合态有机碳占主要组成部分。随着剖面加深,颗
粒有机碳所占比重减少,稳定性的矿物结合态有机碳所占比重增加。
各粒级团聚体有机碳组分含量随剖面加深而减少,且随剖面加深减少趋势逐渐变
缓。同一土层随团聚体粒径变小,有机碳各组分含量增加,但是这种差异主要体现在
大团聚体和微团聚体间。微团聚体有机碳组分贡献率最高,大团聚体有机碳组分贡献
率随粒径变小而变小。
3、土壤剖面团聚体碳酸钙的分布特征
各样地土壤碳酸钙含量在 0-70cm 土层随着剖面加深而增加,在 40-70cm 土层达
到最大,为 100.65g.kg
-1 ,70-100cm 土层略微降低。40-100cm 土层中碳酸钙是团聚
体主要的胶结物质。
同一土层随团聚体粒径变化,碳酸钙含量变化并不显著。在土壤剖面上,>5mm及 0.053-0.25mm 粒级团聚体碳酸钙贡献率随剖面的加深而增加,其它粒级团聚体碳
酸钙贡献率随剖面的加深而逐渐减少。同一土层微团聚体碳酸钙贡献率最高,大团聚
体碳酸钙贡献率随粒径变小而变小。
4、不同胶结物质类型的土壤团聚体稳定性特征
同一土层,微团聚体比例最大,稳定在 27%附近,大团聚体占比随粒径变小而变
小。0-20cm 土层有机碳对土壤团聚化起主要作用,20cm 土层以下碳酸钙对土壤团聚
化起主要作用。各样地土壤>0.25mm 水稳性团聚体均随着剖面加深而逐渐减少,破坏
率随着剖面加深而逐渐增大,这种差异主要体现在 0-20cm,20-40cm,40-100cm 三段
土层上。各粒级团聚体均表现出随着剖面加深其稳定性降低。团聚体稳定性主要是
由>1mm 粒级团聚体稳定性所决定的。
有机碳及组分与全土及各粒级团聚体破坏率呈显著负相关,对全土及各粒级团聚
体稳定性起着主要作用,主要体现在>1mm 粒级团聚体稳定性上。碳酸钙对各粒级团
聚体稳定性作用明显弱于有机碳及其组分,碳酸钙对团聚体稳定性的作用主要体现在
间接影响有机碳转化上。
5、不同胶结物质类型的土壤团聚体孔隙特征
土壤总孔隙度均随着剖面加深而逐渐降低。团聚体孔隙度随剖面加深而增大,但
是土壤团聚体孔隙分布特征表明:0-40cm 土壤团聚体孔隙结构较 40-100cm 具有更多
的毛管孔隙和通气孔隙,具有更好的通透性和保水保肥功能。
不同粒级团聚体孔隙度大小及分布不同,各粒级团聚体总孔隙数量及孔隙度依次
为依次为:2-5mm>>5mm>1-2mm。5-2mm 团聚体胶结物质含量最大,对应的总孔隙数量
及孔隙度最大。1-2mm 团聚体贮存孔隙最大,为 89.23%,通气孔隙在>5mm 团聚体所
占比例最大,为 12.67%。
有机碳含量与团聚体总孔隙数量、团聚体孔隙度呈现负相关,与通气孔隙呈现正
相关;碳酸钙含量与总孔隙数量、团聚体孔隙度呈现正相关。有机碳的增加主要是改
善团聚体粒级间孔隙结构,以及增加团聚体有效孔隙,而碳酸钙主要是增加团聚体贮
存孔隙。
关键词:有机碳及组分,碳酸钙,团聚体,稳定性,孔隙结构

Other Abstract

Due to the complexity of soil types and the environment, there is no universal theory
for the formation of aggregates. In the aggregate formation process, currently,organic
carbon effect has been extensively researched, and the research of inorganic colloids still in
a qualitative description, agglomeration process and the role of organic carbon and calcium
carbonate is mainly to whole soil or large aggregates, however, the distribution and
function of organic carbon and calcium carbonate in the particle size of aggregate remains
unclear. This study measured the distribution characteristics of soil organic carbon and
calcium carbonate in soil aggregates under typical vegetation communities in Ziwuling
forest area different depth soil profiles, and aggregate size distribution, stability
characteristics, pore textural characteristics drivened by the two cementing material, reveal
soil aggregate formation and stability mechanism under different bonding cementing
characteristics. On the basis of the existing research, make the cementation on soil
aggregate formation and stable process further clear, and provide theoretical support and
decision-making basis for soil carbon sequestration, soil and water conservation. The main
results are as follows:
1. The distribution of organic carbon in soil profiles
Soil organic carbon content were with profile gradually reduce, 0-10cm soil organic
carbon content was higher than 15g.kg -1 and 10-20cm soil organic carbon content is about
10g.kg -1 and below 20cm soil organic carbon content is less than or equal to 5g.kg -1 ;
organic carbon mainly in 0-20cm soil aggregates play mainly cementation.
The organic carbon content of the grain size aggregates decreased with the profile of
the organic carbon content. The organic carbon fraction of >5 mm and 0.053-0.25mm
fractions increased with the depth of the profile, and the organic carbon contribution rate of
other grain fractions decreased gradually with the increase of the profile. The contribution
of organic carbon in microaggregates was the highest, and the organic carbon contribution
rate of the aggregates decreased with the decrease of the particle size.
2. The distribution of organic carbon fractions of soil profiles  The contents of organic carbon fractions decreased gradually along with the
deepening of the profile. The organic carbon of the 0-10cm soil layer is the main
constituent, and the organic carbon of the 10-100cm layer is the main part of the organic
carbon. Along with the depth of the profile, the proportion of particulate organic carbon
decreases, and the stability of the mineral bound organic carbon increases.
The contents of organic carbon fractions of the fractions decreased with the deepening
of the profiles, and decreased with the deepening of the profile. The same soil layer
decreased with the increase of the size of the organic carbon, but the difference was mainly
reflected in the large aggregates and micro aggregates. The organic carbon contribution
rate of the microaggregates were the highest, and the organic carbon contribution rate of
large aggregates fractions decreased with the particle size smaller.
3. Distribution of calcium carbonate in soil profiles
The content of calcium carbonate in the 0-70cm soil layer increased with the depth of
the profile, and reached the maximum in the 40-70cm soil layer, is 100.65g.kg -1 . Then
decreased slightly in the 70-100cm soil layers. Calcium carbonate is the main cementing
substance in the 40-100cm soil layer.
The changes of the contents of calcium carbonate in the same soil layer were not
significant. The contribution of calcium carbonate in the soil profile, >5mm and
0.053-0.25mm fractions increased with the depth of the profile, and others’ decreased with
the depth of the profile. The calcium carbonate contribution rate of the microaggregates
were the highest, and the calcium carbonate contribution rate of large aggregates fractions
decreased with the particle size smaller.
4. The stability of soil aggregates in different soil cement materials
In the same soil layer, the ratio of micro aggregates is the largest, and the stability is
near 27%. The size of large aggregates decreases with the size of the particles. The organic
carbon plays an important role in soil agglomeration in 0-20cm soil layer, and the calcium
carbonate plays a major role in the soil agglomeration in 20-100cm soil layer. Kinds
of >0.25 mm soil water stable aggregates with depth and gradually reduce, failure rate with
soil depth increases gradually, this difference is mainly reflected in the 0-20cm, 20-40cm,
40-100cm three layers. The stability of aggregates decreases with the deepening of the
profile. The stability of aggregate was determined by the stability of >1mm particles.
Organic carbon and its components is significantly negative correlated with the
particle size of aggregate rate of destruction, the stability of aggregate was determined by
them and mainly reflected in the >1mm aggregates. The effect of calcium carbonate on the  stability of the aggregates was significantly weaker than that of organic carbon and its
components, and it was mainly reflected in the conversion of organic carbon indirectly.
5. The pore structure of soil aggregates in different soil cement materials
The total porosity of soil decreased gradually with the deepening of the profile.
Aggregate porosity with increasing soil depth increases, but soil pore distribution indicated:
0-40cm soil aggregate pore structure is 40-100cm has more capillary porosity and aeration
porosity and has better permeability and protect the function of water and fertilizer.
Different size aggregate porosity size and distribution is different, each size class
reunion total pore volume and porosity in order as follows: 2-5mm>>5mm>1-2mm. The
content of 5-2mm aggregate was the largest, and the total porosity and porosity also were
the largest. The porosity of 1-2mm aggregates was the largest, and the aeration porosity of
was the largest in >5mm aggregates, and was 12.67%.
Organic carbon content and reunion total pore number, aggregate porosity show
negative correlation, and aeration porosity showed positive correlation; calcium carbonate
content and total pore quantity, aggregate porosity presented positive correlation. The
increase of organic carbon is mainly to improve the pore structure of aggregates, and
increase the effective porosity of aggregates, while the carbonate is mainly to increase the
porosity of aggregates.
Key words: organic carbon and composition, calcium carbonate, aggregate, stability,
pore structure

Language中文
Document Type学位论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/9024
Collection水保所知识产出(1956---)
Recommended Citation
GB/T 7714
张耀方. 子午岭林区不同 胶结物质 类型 的 土壤 团聚 体 结构 特征[D]. 北京. 中国科学院研究生院,2015.
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