Profile Distribution of Soil Organic Carbon Components in Chernozem Soils Under Different Land Use Types

LI Chunli; DONG Jun; WANG Hongbin; WANG Liqun; ZHAO Lanpo

doi:10.13870/j.cnki.stbcxb.2022.05.037

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Profile Distribution of Soil Organic Carbon Components in Chernozem Soils Under Different Land Use Types

更新时间：2025-03-12

- Profile Distribution of Soil Organic Carbon Components in Chernozem Soils Under Different Land Use Types
- Vol. 36, Issue 5, Pages: 304-310(2022)
- 作者机构：
  
  1. 吉林农业大学资源与环境学院, 吉林省商品粮基地土壤资源可持续利用重点实验室,长春,130118
  2. 吉林省土地整治中心,长春,130061
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.05.037
  CLC： S153.6
- Published：2022
- 稿件说明：
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LI Chunli, DONG Jun, WANG Hongbin, et al. Profile Distribution of Soil Organic Carbon Components in Chernozem Soils Under Different Land Use Types[J]. 2022, 36(5): 304-310.
DOI：

LI Chunli, DONG Jun, WANG Hongbin, et al. Profile Distribution of Soil Organic Carbon Components in Chernozem Soils Under Different Land Use Types[J]. 2022, 36(5): 304-310. DOI： 10.13870/j.cnki.stbcxb.2022.05.037.

摘要

为研究土地利用方式对土壤碳库的影响

以东北黑钙土区的天然草地、人工林地和耕地为研究对象

采集0—100 cm土体中不同土层样品(A、AB、Bk、BC和C层)

测定不同利用方式土壤有机碳(SOC)、水溶性有机碳(WSOC)、轻组有机碳(LFOC)和重组有机碳(HFOC)含量。结果表明:3种利用方式SOC、LFOC和HFOC主要分布在A层

但草地WSOC含量在Bk层最多(0.27 g/kg)。由A~C层

3种土地利用方式土壤有机碳及组分有机碳含量总体均呈减少趋势

但减少程度明显不同

天然草地缓慢减少

人工林地急剧减少

耕地逐渐减少。草地转换为林地和开垦为耕地后

均造成土壤有机碳及组分有机碳含量减少

WSOC减少34%和48%

LFOC减少20%和37%

HFOC减少7%和5%

SOC减少10%和16%。草地转换为林地和开垦为耕地后

WSOC/SOC、LFOC/SOC显著降低

但HFOC/SOC却提高

说明草地被开垦后活性有机碳含量快速下降。土地利用方式和土层对SOC、WSOC和LFOC具有显著影响

且对SOC和HFOC叠加效应较强。同时

土壤理化性质也在一定程度上影响着SOC、WSOC、LFOC和HFOC。应制定合理土地利用管理政策

保护自然草地免遭破坏

减少土壤有机碳流失

发挥草地生态系统碳固存的重要作用。

Abstract

In order to assess the influence of land use on soil carbon pool

natural grassland

artificial woodland (directly converted from natural grassland) and cropland (reclaimed from natural grassland) in Chernozem region of Northeast China

were taken as research objects. A total of 45 soil samples were collected from these three land use types. Five soil pedogenic horizons (A

BC and C) in 0—100 cm soil were collected. Soil organic carbon (SOC)

water soluble organic carbon (WSOC)

light fraction organic carbon (LFOC)

and heavy fraction organic carbon (HFOC) contents were determined. The results showed that the contents of SOC

LFOC

and HFOC were mainly distributed in horizon A

but the content of WSOC was the highest in horizon BK

which was 0.27 g/kg. From horizon A to horizon C

SOC and its components contents of the three land use types all showed a decreasing trend

but the decreasing degree was obviously different. The grassland decreased slowly

the woodland decreased sharply

and the cropland decreased gradually. The contents of WSOC

LFOC

HFOC

and SOC decreased by 34% and 48%

20% and37%

7% and 5%

10% and 16%

respectively

after the grassland were converted into woodland and cropland. After grassland was converted to woodland and cropland

WSOC/SOC and LFOC/SOC decreased significantly but HFOC/SOC increased

indicating that the content of active organic carbon decreased rapidly. Land use types and soil horizons had significant effects on SOC

WSOC and LFOC

and had strong superposition effects on SOC and HFOC. At the same time

soil physical and chemical properties also affected SOC

WSOC

LFOC and HFOC to some extent. Rational land use management policies should be formulated to protect natural grassland from destruction

and play an important role in carbon sequestration of grassland ecosystem.

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