Distribution Characteristics of Organic Carbon in Soil Water-stable Aggregates of Wutai Mountain

doi:10.13870/j.cnki.stbcxb.2017.04.026

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Distribution Characteristics of Organic Carbon in Soil Water-stable Aggregates of Wutai Mountain

更新时间：2025-03-12

- Distribution Characteristics of Organic Carbon in Soil Water-stable Aggregates of Wutai Mountain
- Vol. 31, Issue 4, Pages: 159-165(2017)
- 作者机构：
  
  1. 山西农业大学资源环境学院，山西太谷,030801
  2. 山西农业大学农业资源与环境国家级实验教学示范中心，山西太谷,030801
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.04.026
  CLC： S152.4;S153.6
- Published：2017
- 稿件说明：
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Distribution Characteristics of Organic Carbon in Soil Water-stable Aggregates of Wutai Mountain[J]. 2017, 31(4): 159-165.
DOI：

Distribution Characteristics of Organic Carbon in Soil Water-stable Aggregates of Wutai Mountain[J]. 2017, 31(4): 159-165. DOI： 10.13870/j.cnki.stbcxb.2017.04.026.

摘要

为揭示五台山垂直带土壤不同形态团聚体有机碳分布特征，以五台山垂直带土壤为研究对象，于2016年8月从高海拔至低海拔对亚高山草甸土、山地草甸土、棕壤、淋溶褐土、石灰性褐土样品进行采集，并且通过湿筛法和物理分组技术获得不同土壤类型中＞2，2～0.25，0.25～0.053，＜0.053 mm水稳性团聚体，进一步分析了土壤及各级水稳性团聚体的总有机碳、颗粒有机碳（POC）和矿物结合有机碳（MOC）。结果表明：亚高山草甸土、山地草甸土和棕壤均以＞2 mm团聚体为最多，达到总水稳性团聚体的45.13%。然而，淋溶褐土和石灰性褐土中分别以2～0.25 mm和0.25～0.053 mm团聚体为最多，分别达到33.79%和39.95%。随着海拔高度的降低土壤有机碳含量依次降低，且不同土壤类型中，＞2 mm和2～0.25 mm团聚体有机碳含量与其对应的土壤有机碳含量呈极显著正相关关系，相关系数分别为r＞2 mm=0.986和r2～0.25 mm=0.966(P＜0.01)。随着土壤团聚体粒径的减小，亚高山草甸土、山地草甸土、棕壤的POC含量呈现下降趋势，而淋溶褐土和石灰性褐土的POC含量呈现升高趋势。亚高山草甸土、山地草甸土、棕壤的MOC含量都以＞2 mm团聚体为最大，淋溶褐土和石灰性褐土分别以2～0.25 mm和0.25～0.053 mm团聚体的MOC含量为最大。各土壤及团聚体中MOC的含量要明显大于POC的含量，而且在土壤和各级大团聚体中二者呈现正相关关系（P＜0.05）。此外，各土壤POC和MOC的含量与土壤有机碳含量也呈现正相关关系（P＜0.05）。因此，随着海拔高度的降低，各土壤团聚体组成由大团聚体向微团聚体转变，亚高山草甸土、山地草甸土、棕壤的碳截获能力强于淋溶褐土和石灰性褐土。

Abstract

To explore organic carbon distribution characteristics in different soil aggregates of Wutai Mountain vertical zone

the soil samples which including subalpine meadow soil

mountain meadow soil

brown soil

leached cinnamon soil

and calcareous cinnamon soil from high altitude to low altitude were collected in August 2016. Water-stable aggregates in different levels (＞2 mm

2～0.25 mm

0.25～0.053 mm and ＜0.053 mm) of different type soils were harvested through wet-sieving method and physical fractionation technique

and the TOC

POC

and MOC of all level aggregates and soils were further analyzed. The results showed that subalpine meadow soil

mountain meadow soil

and brown soil all mainly composed by ＞2 mm aggregates

which accounted for 45.13% of all water-stable aggregates. However

cinnamon soil and calcareous cinnamon soil were mainly composed by 2～0.25 mm and 0.25～0.053 mm aggregates respectively

reached 33.79% and 39.95%. With the decrease of altitude

soil organic carbon content decreased. Besides

the organic carbon content of ＞2 mm and 2～0.25 mm aggregates in different type soils had a great significant positive correlation with the corresponding soil organic carbon content and the correlation coefficients were r＞2 mm=0.986

r2～0.25 mm=0.966 (P＜0.01). Although with the decrease of soil aggregates diameter

the POC contents of sub alpine meadow soil

mountain meadow soil

and brown soil decreased

and the POC contents of leached cinnamon soil and calcareous cinnamon soil increased. The MOC content of subalpine meadow soil

mountain meadow soil and brown soil were highest in ＞2 mm aggregates

and the MOC content of leached cinnamon soil

calcareous cinnamon soil were highest in 2～0.25 mm and 0.25～0.053 mm aggregates

respectively. The soil MOC content was significantly greater than the POC content

and these two showed a positive correlation in soils and all level macro-aggregates (P＜0.05). In addition

the content of POC and MOC in soils also showed a positive correlation with the content of soil organic carbon (P＜0.05). Therefore

the soil aggregates turned from macro-aggregates to micro-aggregates with the decrease of altitude

and the carbon capture ability of subalpine meadow soil

mountain meadow soil and brown soil was stronger than leached cinnamon soil and calcareous cinnamon soil.

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