小兴安岭沼泽湿地微生物残体碳对土壤有机碳组分积累的贡献及影响因素

doi:10.13287/j.1001-9332.202604.015

应用生态学报 ›› 2026, Vol. 37 ›› Issue (4): 1083-1090.doi: 10.13287/j.1001-9332.202604.015

小兴安岭沼泽湿地微生物残体碳对土壤有机碳组分积累的贡献及影响因素

任建昊¹, 矫智慧¹, 朱道光², 孙晓新^1,3*

¹东北林业大学林学院, 森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040;
²黑龙江省科学院自然与生态研究所, 哈尔滨 150036;
³黑龙江三江平原湿地生态系统定位观测研究站, 黑龙江抚远 156500

收稿日期:2025-08-09 修回日期:2026-02-24 出版日期:2026-04-18 发布日期:2026-05-29
通讯作者: *E-mail: sunxiaoxin@nefu.edu.cn
作者简介:任建昊, 男, 2000年生, 硕士研究生。主要从事沼泽湿地微生物残体碳研究。E-mail: 2438605091@qq.com
基金资助:
国家自然科学基金面上项目(32371614)和黑龙江省自然科学基金项目联合引导项目(LH2024C038)

Accumulative contribution of microbial necromass carbon in the Xiaoxing’an Mountains wetland to soil organic carbon components and its influencing factors

REN Jianhao¹, JIAO Zhihui¹, ZHU Daoguang², SUN Xiaoxin^1,3*

¹Key Laboratory of Sustainable Forest Ecosystem Management of Ministry of Education, School of Forestry, Northeast Forestry University, Harbin 150040, China;
²Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin 150036, China;
³Heilongjiang Sanjiang Plain Wetland Ecosystem Observation and Research Station, Fuyuan 156500, Heilongjiang, China

Received:2025-08-09 Revised:2026-02-24 Online:2026-04-18 Published:2026-05-29

摘要/Abstract

摘要： 微生物残体碳(MNC)是土壤有机碳(SOC)的重要组成部分,对土壤碳固存具有关键作用,但不同类型沼泽湿地中微生物残体碳对有机碳组分积累的贡献差异及影响机制尚不明确。本研究选取小兴安岭典型天然森林沼泽、灌丛沼泽和草本沼泽为对象,分析3种类型沼泽湿地0～40 cm土层微生物残体碳对土壤颗粒态有机碳(POC)和矿质结合态有机碳(MAOC)的积累贡献及影响因素。结果表明:1)3种沼泽土壤有机碳组分(MAOC和POC)含量均随土壤深度增加而减少。灌丛沼泽土壤MAOC含量最高(109.96 g·kg^-1),草本沼泽POC含量最高(22.74 g·kg^-1)。2)在森林沼泽和灌丛沼泽,0～20 cm土层MNC在MAOC中占比(42.9%和23.1%)高于POC(25.6%和14.1%),20～40 cm土层(41.1%和9.6%)也高于POC(12.4%和6.6%);在草本沼泽,0～20 cm土层MNC在MAOC中占比(31.0%)仍高于POC(13.2%),而20～40 cm土层MNC在MAOC中占比(8.2%)低于POC(24.8%)。3)森林沼泽和灌丛沼泽中pH和SOC是调控MNC在有机碳组分中分配的关键因子,而草本沼泽中SOC对MNC分配具有主导作用。本研究揭示了小兴安岭不同类型沼泽湿地MNC在有机碳组分中的分配规律与影响因素,丰富了湿地土壤微生物碳泵理论的区域化研究。

关键词: 沼泽, 土壤有机碳, 微生物残体碳, 颗粒态有机碳, 矿质结合态有机碳

Abstract: Microbial necromass carbon (MNC) constitutes a significant component of soil organic carbon (SOC) and plays a crucial role in soil carbon sequestration. However, the accumulative contribution and impact mechanism of MNC to organic carbon fractions across different wetlands remain unclear. In this study, we analyzed the accumulative contribution and impact mechanism of microbial necromass carbon to particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) in the 0-40 cm soil layer of these three wetland types in the Xiaoxing’an Mountains, including typical natural forested swamps, shrub swamps, and marshes. The results showed that: 1) Soil organic carbon fractions (MAOC and POC) decreased with soil depth across the three wetland types. Shrub swamp soil exhibited the highest MAOC contents (109.96 g·kg^-1), while marsh soil had the highest POC contents (22.74 g·kg^-1). 2) In forested swamps and shrub swamps, the proportion of MNC in MAOC in the 0-20 cm soil layer (42.9% and 23.1%) was higher than that in POC (25.6% and 14.1%). Similarly, in the 20-40 cm layer, the values (41.1% and 9.6%) were also higher than those in POC (12.4% and 6.6%). In marshes, the proportion of MNC in MAOC (31.0%) was higher than that in POC (13.2%) in the 0-20 cm soil layer, whereas the proportion of MNC in MAOC (8.2%) was lower than that in MAOC (24.8%) in the 20-40 cm soil layer. 3) In forested swamps and shrub swamps, pH and SOC were key factors regulating the partitioning of MNC contributions to orga-nic carbon fractions, whereas SOC dominated MNC allocation in marshes. By revealing the distribution patterns and influencing factors of MNC in organic carbon fractions across different wetlands in the Xiaoxing’an Mountains, our results enrich understanding on the microbial carbon pump theory in wetland soils.

Key words: swamp/marsh, soil organic carbon, microbial necromass carbon, particulate organic carbon, mineral-associated organic carbon

任建昊, 矫智慧, 朱道光, 孙晓新. 小兴安岭沼泽湿地微生物残体碳对土壤有机碳组分积累的贡献及影响因素[J]. 应用生态学报, 2026, 37(4): 1083-1090.

REN Jianhao, JIAO Zhihui, ZHU Daoguang, SUN Xiaoxin. Accumulative contribution of microbial necromass carbon in the Xiaoxing’an Mountains wetland to soil organic carbon components and its influencing factors[J]. Chinese Journal of Applied Ecology, 2026, 37(4): 1083-1090.

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小兴安岭沼泽湿地微生物残体碳对土壤有机碳组分积累的贡献及影响因素

Accumulative contribution of microbial necromass carbon in the Xiaoxing’an Mountains wetland to soil organic carbon components and its influencing factors

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