Stability of Deep Soil Organic Carbon of Dam Land on the Loess Plateau

ZHOU Shixuan; XIA Bin; HAO Wanglin; ZHANG Zuoyuan; XU Mingxiang; LIANG Yinli

doi:10.13870/j.cnki.stbcxb.2022.04.035

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Stability of Deep Soil Organic Carbon of Dam Land on the Loess Plateau

更新时间：2025-03-12

- Stability of Deep Soil Organic Carbon of Dam Land on the Loess Plateau
- Vol. 36, Issue 4, Pages: 284-289(2022)
- 作者机构：
  
  1. 西北农林科技大学林学院, 陕西杨凌,712100
  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, 陕西杨凌,712100
  3. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.04.035
  CLC： S152.4
- Published：2022
- 稿件说明：
移动端阅览
ZHOU Shixuan, XIA Bin, HAO Wanglin, et al. Stability of Deep Soil Organic Carbon of Dam Land on the Loess Plateau[J]. 2022, 36(4): 284-289.
DOI：

ZHOU Shixuan, XIA Bin, HAO Wanglin, et al. Stability of Deep Soil Organic Carbon of Dam Land on the Loess Plateau[J]. 2022, 36(4): 284-289. DOI： 10.13870/j.cnki.stbcxb.2022.04.035.

摘要

淤地坝作为黄土高原重要的碳储库，其深层土壤有机碳稳定性在很大程度上影响坝地土壤储碳能力和碳排放。以黄土丘陵区不同利用年限的坝地为对象，从坝地剖面土壤有机碳含量及其组分入手，研究不同利用年限、不同沉积深度下，土壤有机碳含量及其稳定性的变化特征和影响因素。结果表明：（1）坝地深层土壤有机碳（SOC）含量低于该区坡耕地表层土壤有机碳含量，并未呈现明显的有机碳富集现象。随利用年限增加，坝地SOC含量呈增加趋势。（2）不同利用年限坝地的SOC、易氧化碳（EOC）、微生物量碳（MBC）、水溶性碳（DOC）含量呈现出明显的表聚现象。MBC、DOC和EOC含量在土壤0—60 cm内较高。（3）相较于坝地浅层土壤而言，坝地深层土壤有机碳具有较高的稳定性，长期耕作会降低坝地深层土壤有机碳稳定性。（4）坝地浅层和深层土壤有机碳稳定性变化的主导因素不同。浅层土壤有机碳稳定性主要受土层深度、有机碳含量和黏粒含量的影响，分别能解释其变异的50.4%，19.6%和11.8%；深层土壤有机碳稳定性主要受有机碳含量、土壤含水量和利用年限的影响，分别能解释其变异的38.9%，33.9%和11.8%。

Abstract

As an important carbon reservoir in the Loess Plateau

the stability of soil organic carbon in the deep layer of silt dam greatly affects soil carbon storage capacity and carbon emission. In this study

the soil organic carbon content and its components of the silt dam profile in loess hilly-gully region were investigated to study the variation characteristics and influencing factors of soil organic carbon content and its stability under different utilization years and different deposition depths. Results demonstrated that:(1) Soil organic carbon (SOC) content in the deep layer of the dam was lower than that in the surface layer of the sloping farmland

and there was no obvious organic carbon enrichment phenomenon. The SOC content of dam land increased with the increasing of utilization years. (2) The contents of SOC

EOC

MBC and DOC in the dam land with different utilization years showed obvious surface aggregation phenomenon. The content of MBC

DOC and EOC was higher in 0-60 cm soil layer. (3) Compared with the shallow soil

the SOC in the deep layer of the dam had higher stability

long-term tillage in dam would reduce the stability of SOC in deep soil. (4) The dominant factors affected SOC stability in shallow and deep soils were different. The stability of shallow SOC was mainly affected by soil depth

organic carbon content and clay content

which could explain 50.4%

19.6% and 11.8% of the variation

respectively. The stability of deep SOC was mainly affected by organic carbon content

soil water content and utilization years

which could explain 38.9%

33.9% and 11.8% of the variation

respectively.

关键词

Keywords

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