Effects of Land Use Patterns on Aggregate Stability and Organic Carbon of Calcareous Soil in Karst Area

DENG Zhihao; YANG Jing; DAI Quanhou; LI Qinglin; DONG Tianfu

doi:10.13870/j.cnki.stbcxb.2021.05.017

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Effects of Land Use Patterns on Aggregate Stability and Organic Carbon of Calcareous Soil in Karst Area

更新时间：2025-03-12

- Effects of Land Use Patterns on Aggregate Stability and Organic Carbon of Calcareous Soil in Karst Area
- Vol. 35, Issue 5, Pages: 114-121(2021)
- 作者机构：
  
  贵州大学林学院,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.017
  CLC： S158.3
- Published：2021
- 稿件说明：
移动端阅览
DENG Zhihao, YANG Jing, DAI Quanhou, et al. Effects of Land Use Patterns on Aggregate Stability and Organic Carbon of Calcareous Soil in Karst Area[J]. 2021, 35(5): 114-121.
DOI：

DENG Zhihao, YANG Jing, DAI Quanhou, et al. Effects of Land Use Patterns on Aggregate Stability and Organic Carbon of Calcareous Soil in Karst Area[J]. 2021, 35(5): 114-121. DOI： 10.13870/j.cnki.stbcxb.2021.05.017.

摘要

通过野外采样与室内分析试验，探究桂西北喀斯特区土地利用方式对石灰土土壤结构与肥力的影响。基于长期定位观测小区，分析比较刈割草地（CD）、乡土树种（XT）、落叶果园（GY）、种植牧草（MC）、种植玉米（YM）5种常见土地利用方式在石灰土表层（0—10 cm）和亚表层（10—20 cm）土壤的团聚体稳定性及其有机碳赋存特征。结果表明：5种土地利用方式下土壤机械稳定性团聚体含量均随粒级减小而减小，水稳性团聚体含量随粒级减小表现为先减小后增大，并且干湿筛团聚体粒级配比均以>1 mm粒径为主，其范围分别为67.04%~90.11%，66.83%~84.65%。干筛下的团聚体稳定性指标平均重量直径（MWD）与几何平均直径（GMD）在表层和亚表层均为XT>MC≈GY≈YM>CD，湿筛下的MWD与GMD在表层差异明显（P<0.05），表现为XT和MC较高，CD与YM相对较低。就全土有机碳含量而言，表层均高于亚表层，在表层土壤MC、CD、XT显著高于GY和YM （P<0.05），在亚表层土壤仅CD较高。5种土地利用方式下各级土壤团聚体有机碳含量与其全土有机碳含量相近。此外，各土地利用方式团聚体有机碳贡献率总体上随团聚体粒级减小而减小，XT和MC土壤团聚体稳定性与有机碳含量均较高，研究结果以期为该区域土地利用结构调整提供理论支撑。

Abstract

Through field sampling and laboratory analysis

the effects of land use patterns on soil structure and fertility of calcareous soil in karst area of Northwest Guangxi were investigated. Based on the long-term observation plots

we selected five common land use patterns

including mowing grassland (CD)

native tree species (XT)

deciduous orchard (GY)

planted pasture (MC) and planted maize (YM). The stability of soil aggregates and the characteristics of organic carbon in the surface (0-10 cm) and sub-surface (10-20 cm) soil of the five land use patterns were analyzed and compared. The results showed that the content of soil mechanical stable aggregates of the five land use patterns all decreased with the decreasing of particle size

and the content of water-stable aggregates decreased first and then increased with the decreasing of particle size. In addition

the soil aggregates measured by both dry and wet sieve methods were dominated by the aggregates that bigger than 1 mm

and their ratio ranged from 67.04% to 90.11% and from 66.83% to 84.65%

respectively. The mean weight diameter (MWD) and geometric mean diameter (GMD) were employed to evaluate the stability of soil aggregates. Under the dry sieve method

MWD and GMD of both surface and subsurface soil followed the order of XT>MC≈GY≈YM>CD. Under the wet sieve method

MWD and GMD were significantly (P<0.05) different in surface soil

which were relatively higher in XT and MC

and relatively lower in CD and YM. The total soil organic carbon content was higher in surface soil than that in sub-surface soil

and it was significantly (P<0.05) higher in MC

CD and XT than those in GY and YM in surface soil

but only relatively higher in sub-surface soil in CD. The organic carbon content of soil aggregates at all levels was similar to the total soil organic carbon content under each land use patterns. In addition

the contribution rate of organic carbon of aggregates generally decreased with the decreasing of aggregated size under different land use patterns. The stability of soil aggregates and the organic carbon content were relatively higher in XT and MC. The results of this study could provide theoretical support for the adjustment of land use structure in this area.

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