Effect of Foreign Soils with Different Addition Proportions on Carbon Emission in a Reclaimed Soil of Iron Ore Waste

KANG Ying; ZHAO Wenting; ZHANG Junmei; FENG Zhe; XIE Mengjiao; LIU Tengteng; LIU Qi; WANG Yang

doi:10.13870/j.cnki.stbcxb.2021.05.046

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Effect of Foreign Soils with Different Addition Proportions on Carbon Emission in a Reclaimed Soil of Iron Ore Waste

更新时间：2025-03-12

- Effect of Foreign Soils with Different Addition Proportions on Carbon Emission in a Reclaimed Soil of Iron Ore Waste
- Vol. 35, Issue 5, Pages: 346-353(2021)
- 作者机构：
  
  1. 河北农业大学资源与环境科学学院,河北,保定,071000
  2. 河北农业大学国土资源学院,河北,保定,071000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.046
  CLC： S157.1
- Published：2021
- 稿件说明：
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KANG Ying, ZHAO Wenting, ZHANG Junmei, et al. Effect of Foreign Soils with Different Addition Proportions on Carbon Emission in a Reclaimed Soil of Iron Ore Waste[J]. 2021, 35(5): 346-353.
DOI：

KANG Ying, ZHAO Wenting, ZHANG Junmei, et al. Effect of Foreign Soils with Different Addition Proportions on Carbon Emission in a Reclaimed Soil of Iron Ore Waste[J]. 2021, 35(5): 346-353. DOI： 10.13870/j.cnki.stbcxb.2021.05.046.

摘要

添加客土配比的不同对铁矿废石复垦土壤的改良效果和经济成本有重要影响，为明确不同配比客土处理下铁矿废石混合土碳排放的动态特征并揭示其驱动因子，于2019年1—12月采用田间试验与室内分析相结合的方法，在自然修复状态下，设置铁矿废石与客土体积比分别为T1（1∶1）、T2（1∶2）、T3（1∶4）和T4（0∶1）4个处理，监测日、季节尺度下铁矿废石混合土碳排放及水热动态变化特征，并于2019年4，7，10，12月测定混合土的理化性质。结果表明：季尺度下铁矿废石混合土碳排放随温度升降表现为夏高冬低的变化特征，随客土比例增大，混合土碳排放有增强的趋势，各处理间碳排放仅在7—9月差异显著（P<0.05），表现为T4>T2>T3>T1；日尺度下铁矿废石混合土碳排放最高值出现在中午12：00—14：00，最低值出现在凌晨4：00—6：00，当混合土温度较低时，碳排放出现负值现象；随客土比例增大铁矿废石混合土碳排放敏感系数Q10逐渐增大（2.07~2.37），添加客土在一定程度上降低混合土pH而增加混合土有效磷、全氮、有机碳含量和过氧化氢酶、蔗糖酶活性。综合研究铁矿废石混合土理化特性对碳排放的影响，可为铁矿复垦区土壤碳排放研究提供理论依据。

Abstract

The different addition proportions of foreign soil has an important impact on the improvement effect and economic cost of iron ore waste reclamation soil. From January to December in 2019

field experiments and laboratory analysis were conducted to investigate the dynamic characteristics of soil carbon emission and reveal its driving factors. In the natural remediation state

the volume ratios of iron ore waste to foreign soil were set as T1 (1:1)

T2 (1:2)

T3 (1:4) and T4 (0:1)

respectively. The physical and chemical properties of the mixed soil were determined in April

July

October and December 2019. The results showed that the carbon emission of mixed soil of iron ore and waste rock was higher in summer and lower in winter with the rise and fall of temperature. With the increase of the proportions of foreign soil

the carbon emission of mixed soil had an increasing trend

and the difference was significant only from July to September

which was T4 (0:1) > T2 (1:2) > T3 (1:4) > T1 (1:1). On the daily scale

the maximum carbon emission appeared at 12:00-14:00 pm

and the minimum appeared at 4:00-6:00 am. When the temperature of mixed soil was low

the carbon emission appeared negative. With the increase of the proportions of foreign soil

the sensitivity coefficient Q10 of carbon emission of iron ore waste rock mixed soil gradually increased (2.07~2.37)

and the addition of foreign soil reduced the pH values of mixed soil to a certain extent

but increased the contents of available phosphorus

total nitrogen

organic carbon and the activities of catalase and sucrase. Comprehensive study on the effects of physical and chemical properties of mixed soil of iron ore and waste rock on carbon emission can provide a theoretical basis for the study of soil carbon emission in iron ore reclamation area.

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