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DOI: https://doi.org/10.11988/ckyyb.20250043

三峡库区不同马尾松林土壤碳排放及微生物生物量特征分析

  • 李政 ,
  • 朱海琴 ,
  • 谢苹 ,
  • 贾宝杰 ,
  • 何淑芳
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  • 长江科学院 武汉长江科创科技发展有限公司，武汉 430010
谢 苹（1986—），女，湖北武汉人，工程师，硕士，从事水环境保护及生态修复方面的研究。E-mail:

李 政（1992—），男，河南商丘人，助理工程师，硕士，从事生态修复及流域综合治理方面的研究。E-mail:

收稿日期: 2025-01-16

  修回日期: 2025-03-24

  网络出版日期: 2025-04-30

基金资助

湖北省重点研发计划项目(2023EHA007)

水利部三峡后续工作研究课题(12621400000021J001)

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Analysis of Soil Carbon Release and Microbial Biomass Characteristics in Different Pinus Massoniana Forests in the Three Gorges Reservoir Area

  • LI Zheng ,
  • ZHU Hai-qin ,
  • XIE Ping ,
  • JIA Bao-jie ,
  • HE Shu-fang
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  • Wuhan Changjiang Kechuang Technology Development Co.,Ltd., Changjiang River Scientific Research Institute, Wuhan 430010, China

Received date: 2025-01-16

  Revised date: 2025-03-24

  Online published: 2025-04-30

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摘要

为探究三峡库区土壤呼吸的时间和林分尺度上空间变异特征，以及微生物生物量机理性分析，本文选择不同马尾松林（马尾松纯林、马尾松麻栎混交林）开展不同季节的土壤呼吸速率以及微生物生物量碳氮的监测，并使用壕沟法进一步测定自养呼吸和异养呼吸组分，以及采用单因素方差分析差异性。结果显示：混交林总呼吸和异氧呼吸速率均高于纯林，两种林型下异氧呼吸均占比88%，自养呼吸12%，异氧呼吸贡献率随季节变化呈先降低后升高趋势，自养呼吸则相反。混交林微生物生物量碳和氮含量均比纯林丰富，微生物生物量碳和碳氮比均驱动土壤碳释放，纯林微生物生物量碳氮比15.70，混交林12.82，混交林在无根系及其分泌物情况下碳氮比提高，以便分解较难分解的底物。本研究成果可为三峡库区碳循环和生态建设研究提供重要参考。

关键词： 三峡库区; 土壤呼吸; 微生物生物量

本文引用格式

李政 , 朱海琴 , 谢苹 , 贾宝杰 , 何淑芳 . 三峡库区不同马尾松林土壤碳排放及微生物生物量特征分析[J]. 长江科学院院报, 0 . DOI: 10.11988/ckyyb.20250043

Abstract

In order to explore the temporal variation characteristics of soil respiration and its components, the spatial variation characteristics of forest scale, and the mechanistic explanation of microbial biomass in the Three Gorges Reservoir area, this study selected different Pinus massoniana forests (Pinus massoniana pure forest, Pinus massoniana and Quercus massoniana mixed forest) to monitor the soil respiration rate and microbial biomass carbon (MBC) and nitrogen (MBN) in different seasons, and further determine the components of autotrophic and heterotrophic respiration using the trench method, and use one-way ANOVA to analyze the differences. The results showed that the soil respiration rate of the mixed forest before and after root breaking was higher than that of the pure forest, and the heterotrophic respiration of the pure forest and the mixed forest accounted for 88%, and the autotrophic respiration accounted for 12%, The contribution rate of aerobic respiration decreases first and then increases with seasonal changes, while autotrophic respiration shows the opposite trend. The microbial biomass carbon and nitrogen content in mixed forests are richer than those in pure forests, and the microbial biomass carbon and nitrogen (C/N) ratio drive soil carbon release. The C/N ratio in pure forests is 15.70, while in mixed forests it is 12.82. In the absence of root system and its secretions, the C/N in mixed forests increases to decompose substrates that are difficult to decompose. The results of this study can provide an important reference for the study of carbon cycle and ecological construction in the Three Gorges Reservoir area.

Key words： Three Gorges Reservoir Area; Soil respiration; Microbial biomass

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