Mechanisms of the Effects of Carbon Source Addition on Carbon Transport and Sequestration in Purple Soil Sloping Farmland under Natural Rainfall

LIU Bing; LIU Yu; HAO Zhuo; ZHAN Xiaoying; ZHANG Qingwen; YANG Yang; CHEN Honglin; CHEN Shanghong; LIU Dinghui

doi:10.13870/j.cnki.stbcxb.2025.01.019

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Mechanisms of the Effects of Carbon Source Addition on Carbon Transport and Sequestration in Purple Soil Sloping Farmland under Natural Rainfall

更新时间：2025-03-14

- Mechanisms of the Effects of Carbon Source Addition on Carbon Transport and Sequestration in Purple Soil Sloping Farmland under Natural Rainfall
- Vol. 39, Issue 1, Pages: 229-238(2025)
- 作者机构：
  
  1. 河北建筑工程学院市政与环境工程系,河北,张家口,075000
  2. 中国农业科学院农业环境与可持续发展研究所,北京,100081
  3. 四川省农业科学院农业资源与环境研究所,成都,610066
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2025.01.019
  CLC： S157.1
- Published：2025
- 稿件说明：
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LIU Bing, LIU Yu, HAO Zhuo, et al. Mechanisms of the Effects of Carbon Source Addition on Carbon Transport and Sequestration in Purple Soil Sloping Farmland under Natural Rainfall[J]. 2025, 39(1): 229-238.
DOI：

LIU Bing, LIU Yu, HAO Zhuo, et al. Mechanisms of the Effects of Carbon Source Addition on Carbon Transport and Sequestration in Purple Soil Sloping Farmland under Natural Rainfall[J]. 2025, 39(1): 229-238. DOI： 10.13870/j.cnki.stbcxb.2025.01.019.

摘要

目的紫色土土壤退化形势严峻，水体流失严重，土壤增碳固碳困难，为探究碳源添加对紫色土坡耕地碳固存的影响。方法以四川紫色土坡耕地为对象，在10°紫色土坡耕地设置不施肥(CK)、化肥+秸秆还田(T1)、化肥+秸秆生物炭(T2)、化肥+牛粪(T3)、化肥+有机改土基质(T4)、化肥+生物炭牛粪菇渣堆肥(T5)6种处理，每种处理重复3次。分析降雨量及不同碳源处理下径流、泥沙、碳质量分数的变化特征。结果1) 降雨量＞30 mm，短时强降雨(16.1 mm/h)可促使地表径流的产出。碳源添加可显著减少地表径流量(p＜0.05)，与CK相比，T2、T3、T5减流效益分别达到38.64%、38.61%、62.95%。不同处理产沙量为T1＞T4＞CK＞T2＞T3＞T5，最高较CK降低58.99%。2)地表径流有机碳流失主要以泥沙有机碳为主，占比为67.47%~90.43%。T2、T3、T5可有效减少有机碳迁移，较CK处理有机碳损失总量分别减少21.74%、19.40%、49.28%。T5处理可溶性有机碳(DOC)、可溶性无机碳(DIC)、可溶性总碳(DTC)、泥沙有机碳迁移通量较CK分别减少70.88%、70.92%、37.52%、60.07%。3) PLS-PM表明，降雨是碳迁移的主要驱动因子，降雨特征、土壤理化性质、不同碳源添加均不同程度地影响土壤有机碳固存。结论碳源添加(T2、T3、T5)使有机碳损失总量减少。T5处理有机碳固存量提升，T2和T3减少地表径流各碳组分的流失，而其有机碳固存量减少。表明碳源添加可提升碳质量分数，减少碳迁移，但固存量却减少，需长期试验来验证。研究结果对提升紫色土土壤肥力、维持土壤碳平衡和缓解土壤碳迁移具有重要意义。

Abstract

ObjectiveDegradation of purple soil and water loss is serious

and it is difficult to increase and sequester carbon in the soil. The aim of the study was to explore the impact of carbon source addition on carbon sequestration of purple soil sloping farmland.MethodsPurple soil sloping farmland in Sichuan Province was selected as the research object. Six treatments were set up on 10° purple soil slopes

including no fertilization (CK)

fertilizer+straw returning (T1)

fertilizer+straw biochar (T2)

fertilizer+cow dung (T3)

fertilizer+organic soil matrix (T4)

fertilizer+biochar cow dung and mushroom slag compost (T5)

and each treatment was repeated three times. The change characteristics of runoff

sediment and carbon content under rainfall and different carbon sources were analyzed.Results1) Rainfall > 30 mm and short-term heavy rainfall (16.1 mm/h) could lead to surface runoff. The addition of carbon sources notably decreased surface runoff. In comparison with CK

the runoff reduction benefits of T2

and T5 reached 38.64%

38.61%

and 62.95%

respectively. The sediment erosion in different treatments was observed to follow the order of T1 > T4 > CK > T2 > T3 > T5

with the highest reduction being 58.99% compared to CK. 2) The loss of organic carbon through surface runoff was primarily attributed to sediment organic carbon

which accounted for 67.47%—90.43% of the total organic carbon loss. T2

and T5 were effective in reducing the transport of organic carbon

resulting in a total organic carbon loss reduction of 21.74%

19.40%

and 49.28%

respectively

compared to CK. Furthermore

the carbon fractions of T5

including dissolved organic carbon (DOC)

dissolved inorganic carbon (DIC)

dissolved total carbon (DTC)

and sediment organic carbon

exhibited a reduction in transport fluxes by 70.88%

70.92%

37.52% and 60.07%

respectively

compared to CK. 3) PLS-PM showed that the carbon sequestration of soil organic carbon was influenced to varying degrees by rainfall characteristics

soil physicochemical properties

and the addition of different carbon sources.ConclusionCarbon source addition (T2

T5) can reduce the total amount of organic carbon loss. T5 can increase organic carbon sequestration; T2 and T3 can reduce the loss of each carbon component of surface runoff

but also reduce organic carbon sequestration. Addition of carbon source can increase carbon content and reduce carbon transport

but reduce carbon sequestration. The results need to be verified by long-term experiments. This study is of significant importance for enhancing the fertility of purple soil

maintaining soil carbon balance

and reducing soil carbon loss.

关键词

Keywords

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