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入侵种互花米草广泛分布于中国滨海湿地，近年来大范围的治理工作对滨海湿地碳循环过程产生重要影响。为探究互花米草治理及其复萌对滨海湿地土壤有机碳库的影响，采用深翻法和旋耕法两种治理方式，分析互花米草治理及其复萌对土壤活性有机碳(LOC)组分和土壤胞外酶活性的影响。结果表明，深翻法治理下，未复萌裸滩的DOC、MBC含量和BG、CBH和PHO活性显著降低，互花米草(复萌)的DOC、MBC含量和CBH、 PHO活性显著提高。旋耕法治理下，未复萌裸滩的DOC、MBC和LOC含量和BG、CBH、PHO和PEO活性显著降低，互花米草(复萌)的DOC、MBC和LOC含量和PEO活性显著提高。相关性分析表明深翻法治理下，土壤LOC组分和胞外酶活性受Fe(Ⅲ)/Fe(Ⅱ)影响，SOC、DOC和MBC共同调控胞外酶活性；旋耕法治理下，土壤LOC组分和胞外酶活性受Fe(Ⅲ)/Fe(Ⅱ)和含水率共同影响，MBC含量调控胞外酶活性。结果表明，两种治理方式下，未复萌裸滩和复萌的互花米草均因植物根系泌氧和有机质的输入差异，影响LOC组分和胞外酶活性。但两种治理方式对土壤扰动不同，造成LOC组分和胞外酶活性的响应存在差异。综上，治理后未复萌裸滩存在土壤碳库功能减弱的风险；互花米草治理后复萌虽然促进土壤LOC组分的积累，但土壤胞外酶活性的显著增强，可能加速有机碳矿化分解，不利于土壤碳库的积累与稳定。
Abstract：The invasive species Spartina alterniflora is widely distributed in China's coastal wetlands. In recent years, large-scale control efforts have significantly influenced carbon cycling processes in these ecosystems. To investigate the effects of S. alterniflora management and post-control regrowth on the soil organic carbon(SOC) pool, this study compared two management approaches-deep tilling and rotary tilling-and evaluated their effects on soil labile organic carbon(LOC) fractions and extracellular enzyme activities. Under deep tilling, DOC and MBC contents as well as BG, CBH, and PEO activities in non-regrown bare flats significantly decreased, whereas regrown S. alterniflora significantly increased DOC and MBC contents and CBH and PEO activities. Under rotary tilling, DOC, MBC, and LOC contents and the activities of BG, CBH, PHO, and PEO in non-regrown bare flats significantly decreased, while regrowth significantly increased DOC, MBC, and LOC contents and PEO activity. Correlation analysis indicated that under deep tilling, LOC fractions and enzyme activities were mainly influenced by the Fe(Ⅲ)/Fe(Ⅱ) ratio, with SOC, DOC,and MBC jointly regulating enzyme activity. Under rotary tilling, LOC fractions and enzyme activities were influenced by both the Fe(Ⅲ)/Fe(Ⅱ) ratio and soil moisture, with enzyme activity primarily regulated by MBC. Overall, in both treatments, differences in root oxygen release and organic matter input between non-regrown bare flats and regrown stands of S. alterniflora altered LOC fractions and enzyme activities. However, differences in soil disturbance intensity between deep tilling and rotary tilling led to distinct responses in LOC fractions and enzyme activities. These findings suggest that non-regrown bare flats after control face a risk of weakened soil carbon pool function. Although post-control regrowth of S. alterniflora promotes LOC accumulation, the marked increase in extracellular enzyme activity may accelerate organic carbon mineralization, potentially reducing the long-term stability and accumulation of the soil carbon pool.
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基本信息:
DOI：10.19687/j.cnki.1673-7105.2026.01.005
中图分类号:X144;S154.2;S153.6
引用信息:
[1]丁中浩,马景胜,蒋永参,等.互花米草治理对滨海湿地土壤活性碳组分和酶活性的影响[J].亚热带资源与环境学报,2026,21(01):43-54.DOI:10.19687/j.cnki.1673-7105.2026.01.005.
基金信息:
国家自然科学基金项目(U22A20584); 福建省自然科学基金(2024J01446); 华东勘测设计院(福建)有限公司科研项目(ZKY2022-FJ-02-02); 福建省环保科技计划项目(2024R004)
2025-12-03
2025-12-03
2025-12-03