石灰性土壤添加不同量碳酸钙对秸秆有机碳矿化的影响

doi:10.16258/j.cnki.1674-5906.2022.10.008

生态环境学报 ›› 2022, Vol. 31 ›› Issue (10): 2002-2009.DOI: 10.16258/j.cnki.1674-5906.2022.10.008

石灰性土壤添加不同量碳酸钙对秸秆有机碳矿化的影响

李梦丽¹(), 徐墨馨¹, 陈永山², 叶丽丽¹, 蒋金平¹^,³^,^*()

1.广西环境污染控制理论与技术重点实验室，广西桂林 541004
2.泉州师范学院资源与环境科学学院，福建泉州 362000
3.广西岩溶地区水污染控制用水安全保障协同创新中心，广西桂林 541004

收稿日期:2022-06-14 出版日期:2022-10-18 发布日期:2022-12-09
通讯作者: ^*蒋金平（1972年生），男，研究员，博士，主要从事土壤环境与污染修复研究工作。E-mail: jiangjinping74@163.com
作者简介:李梦丽（1996年生），女，硕士研究生，主要从事土壤环境与污染修复研究工作。E-mail: LiMengli1218@163.com
基金资助:
广西自然科学基金项目(2020GXNSFAA297124)

Effects of Different Amounts of Calcium Carbonate on the Mineralization of Straw Organic Carbon in Calcareous Soil

LI Mengli¹(), XU Moxin¹, CHEN Yongshan², YE Lili¹, JIANG Jinping¹^,³^,^*()

1. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, P. R. China
2. School of Resources and Environmental Sciences, Quanzhou Normal University, Quanzhou 362000, P. R. China
3. Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin 541004, P. R. China

Received:2022-06-14 Online:2022-10-18 Published:2022-12-09

摘要/Abstract

摘要：

广西石灰性土壤面积较广，其较高碳酸盐含量能够影响土壤中物质循环。为了明确石灰性土壤中碳酸盐含量对土壤秸秆有机碳矿化过程的影响，加深对石灰性土壤有机碳的周转与固存机制的认识，开展了土壤外源秸秆添加培养试验，分别设置无添加对照（CK）、添加5%秸秆（C0）、5%秸秆+5%碳酸钙（C1）、5%秸秆+15%碳酸钙（C2）和5%秸秆+25%碳酸钙（C3）处理，以研究石灰性土壤中外源秸秆有机碳的转化与土壤碳酸钙含量的关系。结果表明，与对照相比，添加秸秆后土壤CO₂释放速率、累积释放量、活性有机碳含量均得到大幅提升。培养期间，各处理土壤CO₂释放速率均表现为前期（第2—5天）快速下降、中期（第5—39天）缓慢下降、后期（第39—60天）趋于稳定。不同碳酸钙处理使土壤CO₂累积释放量提升了5.10%—15.69%，但C3处理的土壤CO₂释放速率、累积释放量均低于C1和C2处理，并对土壤有机碳矿化表现出强烈负激发效应，最高为183.33%。随着土壤碳酸钙含量的增加，土壤微生物生物量碳（MBC）含量逐渐降低。土壤碳酸钙能够促进土壤溶解性有机碳（DOC）含量增加，与C0相比，C1处理DOC含量提高了106.35%。相关分析表明，土壤CO₂累积释放量和土壤MBC、DOC含量均呈极显著正相关（P<0.01），土壤MBC含量和DOC含量呈显著正相关关系（P<0.05）。

关键词: 石灰性土壤, 碳酸钙, 秸秆, 有机碳矿化, 活性有机碳

Abstract:

The calcareous soil was widely distributed in Guangxi, and its high carbonate content can affect the material cycling in the soil. In order to clarify the influence of carbonate content in calcareous soil on the mineralization of organic carbon in soil straw, the experiment of adding exogenous straw to soil was carried out. The treatments of no addition control (CK), with addition of 5% straw (C0), 5% straw+5% calcium carbonate (C1), 5% straw+15% calcium carbonate (C2) and 5% straw+25% calcium carbonate (C3) were set up respectively to study the relationship between the transformation of exogenous straw organic carbon in calcareous soil and the content of soil calcium carbonate. Compared with the control, the rate of CO₂ release, cumulative release and active organic carbon content of soil were significantly increased after adding straw. During the incubation period, the soil CO₂ release rate of each treatment showed a rapid decrease in the early stage (2-5 d), a slow decrease in the middle stage (5-39 d), and a stable trend in the late stage (39-60 d). The treatments with the addition of calcium carbonate increased the cumulative release of soil CO₂by 5.10%-15.69%, but the release rate and cumulative release of soil CO₂ in C3 treatment were lower than those in C1 and C2 treatments, and showed a strong negative excitation effect on soil organic carbon mineralization, up to 183.33%. Soil microbial biomass carbon (MBC) content gradually decreased with the increase of soil calcium carbonate content. Soil calcium carbonate could promote the increase of soil dissolved organic carbon (DOC). Compared with C0, the DOC content of C1 treatment increased by 106.35%. Correlation analysis showed that the contents of soil MBC and DOC were significantly positively correlated with the cumulative release of soil CO₂(P<0.01). In addition, there was a significant positive correlation between the contents of soil MBC and DOC (P<0.05).

Key words: calcareous soil, calcium carbonate, straw, organic carbon mineralization, activated organic carbon

中图分类号:

S153
X171.4

李梦丽, 徐墨馨, 陈永山, 叶丽丽, 蒋金平. 石灰性土壤添加不同量碳酸钙对秸秆有机碳矿化的影响[J]. 生态环境学报, 2022, 31(10): 2002-2009.

LI Mengli, XU Moxin, CHEN Yongshan, YE Lili, JIANG Jinping. Effects of Different Amounts of Calcium Carbonate on the Mineralization of Straw Organic Carbon in Calcareous Soil[J]. Ecology and Environment, 2022, 31(10): 2002-2009.

图/表 6

图1 不同含量碳酸钙土壤的CO2释放速率 CK：不添加任何外源物质处理；C0：5%秸秆处理；C1：5%秸秆+5%碳酸钙处理；C2：5%秸秆+15%碳酸钙处理；C3：5%秸秆+25%碳酸钙处理，下同

Figure 1 Release rate of soil CO2 with different content of calcium carbonate CK: without adding any exogenous substances; C0: 5% straw treatment; C1: 5% straw+5% calcium carbonate treatment; C2: 5% straw+15% calcium carbonate treatment; C3: 5% straw+25% calcium carbonate treatment, The same below

图2 不同含量碳酸钙土壤的CO2累积释放量

Figure 2 Cumulative release of soil CO2 with different content of calcium carbonate

图3 不同含量碳酸钙土壤的有机碳激发效应

Figure 3 The excitation effect of organic carbon in soils with different contents of calcium carbonate

图4 不同含量碳酸钙对土壤微生物生物量碳的影响不同大写字母表示相同处理不同培养天数间差异显著，不同小写字母表示相同培养天数不同处理间差异显著（P<0.05）。下同

Figure 4 Effects of different contents of calcium carbonate on soil microbial biomass carbon Different capital letters indicate that there is significant difference between different culture days of the same treatment, and different small letters indicate that there is significant difference between different treatments of the same culture days (P<0.05). The same below

图5 不同含量碳酸钙对土壤溶解性有机碳的影响

Figure 5 Effects of different contents of calcium carbonate on soil dissolved organic carbon

表1 土壤CO2累积释放量和活性有机碳含量的相关性分析

Table 1 Correlation analysis between cumulative release of soil CO2 and active organic carbon content

因子 factor	CO₂累积释放量 Cumulative release of soil CO₂	微生物生物量碳 Microbial biomass carbon (MBC)	溶解性有机碳 Dissolved organic carbon (DOC)
CO₂累积释放量 Cumulative release of soil CO₂	1	0.931^**	0.841^**
微生物生物量碳 Microbial biomass carbon (MBC)		1	0.633^*
溶解性有机碳 Dissolved organic carbon (DOC)			1

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石灰性土壤添加不同量碳酸钙对秸秆有机碳矿化的影响

Effects of Different Amounts of Calcium Carbonate on the Mineralization of Straw Organic Carbon in Calcareous Soil

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