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六道沟小流域地形序列土壤碳剖面分布特征及影响因素
毛娜1,2; 邵明安1,2,3,4; 黄来明3,4
2017
Source Publication水土保持学报
Volume31Issue:5Pages:222-239
Abstract

为了更好地理解黄土高原植被恢复与生态重建过程对土壤碳循环过程的影响,研究选取位于黄土高
原六道沟小流域的典型土壤地形序列(东北坡NE序列,西坡W 序列),分析了不同坡向间及同一坡向内随
植被类型变化土壤有机碳和无机碳的剖面分布特征及其影响因素。结果表明:六道沟小流域地形序列土
壤有机碳含量在0—50cm土层内随土层深度增加而显著降低,50cm土层以下基本趋于稳定,且剖面上层
(0—50cm)有机碳含量显著高于剖面下层(50—200cm,p<0.05),但在同一深度土层(0—50,50—200,
0—200cm)不同坡向林地和草地土壤有机碳平均含量均没有显著差异(p>0.05)。与有机碳相比,无机碳
含量相对较高并且主要在剖面下部(50cm以下)不同深度土层富集。NE序列林地和草地剖面无机碳平
均含量接近(p>0.05),而W 序列林地剖面无机碳平均含量显著高于草地(p<0.05);不同坡向草地剖面
无机碳平均含量无显著差异(p>0.05),但不同坡向林地剖面无机碳平均含量表现为W 序列显著高于NE
序列(p<0.05)。0—50cm土层有机碳含量与pH、容重和土壤含水量均呈极显著负相关关系,而与土壤
总孔隙度呈极显著正相关关系;50—150cm土层无机碳含量与pH 和土壤总孔隙度均呈极显著负相关关
系,而与容重、黏粒含量和土壤含水量均呈极显著正相关关系。NE序列和W 序列2m 土体总碳密度相
当,分别为15.2~47.4kg/m2 和18.3~51.3kg/m2,其中无机碳密度占78%~94%,1—2m土层总碳密
度占2m土体总碳密度的35%~74%。若只考虑土壤有机碳库或只考虑浅层1m土壤碳库,六道沟小流
域2m土体总碳储量平均将被低估88%和51%。

Other Abstract

In order to understand the effects of vegetation restoration and ecological restoration process on soil
carbon cycling,the profile distribution of soil organic and inorganic carbon under different slopes and vegetation
types along two toposequences of Liudaogou watershed on the Loess Plateau(China)were investigated,
and the profile distribution characteristics and the influencing factors of soil organic carbon and inorganic carbon
among different slopes and among different vegetation types on the same slope were analyzed.The typical toposequences
were located in the northeast slope(NE sequence)and west slope(W sequence)of the Liudaogou
watershed,respectively.The results showed that soil organic carbon content decreased significantly with increasing of
soil depth within 0-50cm soil layer,and then remained relatively constant in the soil layer deeper than 50cm,and the organic carbon content of the 0-50cm soil layer was significantly higher than those of the 50-
200cm soil layers(p<0.05).However,in the same soil depth(0-50,50-200or 0-200cm),there was
no significant difference on the mean organic carbon content under either forestlands or grasslands among
different slopes(p<0.05).Compared with organic carbon,soil inorganic carbon content was relatively
high,and mainly enriched in the different soil layers deeper than 50cm.In the NE sequence,the mean inorganic
carbon contents were comparable in the forestland and the grassland(p>0.05).In contrast,in the W
sequence the mean inorganic carbon content of the forestland was significantly higher than that of the grassland(
p<0.05);there was no significant difference on the mean inorganic carbon content of the grasslands
among different slopes(p>0.05),while the mean inorganic carbon content of the forestland in the W
sequence was higher than that in the NE sequence(p<0.05).Organic carbon content in the 0-50cm soil
layer was significantly negatively correlated with pH,bulk density and soil water content,but was significantly
positively correlated with soil total porosity;inorganic carbon content in the 50-150cm soil layer was
significantly negatively correlated with pH and total soil porosity,but was significantly positively correlated
with bulk density,clay content and soil water content.Soil carbon densities within 0-2mprofile were
15.2~47.4kg/m2 and 18.3~51.3kg/m2in the NE sequence and W sequence,respectively,in which inorganic carbon
density accounted for 78%~94%.Total carbon density of 1-2msoil layer were 35%~74%of the total
carbon density of 0-2msoil profile.Our study indicated that neglecting inorganic carbon or neglecting deep
soil carbon(1-2m)would lead to underestimation of soil carbon stock by 88%and 51%,respectively.

Keyword六道沟小流域 地形序列 有机碳 无机碳 碳密度 剖面分布
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8515
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源环境学院
2.中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
3.中国科学院地理科学与资源研究所中国科学院生态系统网络观测与模拟重点实验室
4.中国科学院大学,资源与环境学院
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
毛娜,邵明安,黄来明. 六道沟小流域地形序列土壤碳剖面分布特征及影响因素[J]. 水土保持学报,2017,31(5):222-239.
APA 毛娜,邵明安,&黄来明.(2017).六道沟小流域地形序列土壤碳剖面分布特征及影响因素.水土保持学报,31(5),222-239.
MLA 毛娜,et al."六道沟小流域地形序列土壤碳剖面分布特征及影响因素".水土保持学报 31.5(2017):222-239.
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