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- Title
蚂蚁筑巢对热带橡胶人工林土壤甲烷排放 季节动态的影响.
- Authors
王郑钧; 王邵军; 肖 博; 解玲玲; 郭志鹏; 郭晓飞; 李 瑞; 罗 双; 夏佳慧; 杨胜秋; 兰梦杰
- Abstract
Ant nests can affect the process and seasonal dynamics of forest soil methane emissions through mediating methane oxidation/reduction microorganisms and physicochemical environments. To explore the process and mechanism by which ant nests affect soil methane emissions from _He©ea 6raszZzenszs plantation in Xishuangbanna, we measured the seasonal dynamics of methane emissions from ant nest and non-nest soils by using static chamber-gas chromatography method, and analyzed the effect of ant nesting on the changes in functional microbial diversity, microhabitats, and soil nutrients in the plantations. The results showed that: 1) Ant nests significantly affected the mean annual soil methane emissions in tropical plantation. Methane emissions in ant nest were decreased by 59.9% than the non-nest soil. In the dry season, ant nest soil was a methane sink (-1.770 Rg ・m 2・h"), which decreased by 87.2% compared with the non-nest soil, while it was a methane source (0.703 Rg ・m 2・h") that increased by 152.7% in the wet season. 2) Ant nesting affected methane emissions via changing soil temperature, humidity, carbon and nitrogen concentrations. In contrast to the control, the mean annual temperature, humidity, and carbon and nitrogen content increased by 4. 9% - 138. 5% in ant nest soils, which explained 90. 1%, 97. 3%, 27.3%-90.0% of the variation in methane emissions, respectively. 3) Ant nesting affected the emission dynamics through changing the diversity and community structure of methane functional microbe. Compared with the control, the average annual methanogen diversity (Ace, Chdol, Shannon, and Simpson indices) in the ant nest ranged from 一9.9% to 61.2%, which were higher than those (一8.7%一31.2%) of the methane-oxidising bacterial communities. The relative abundance fluctuations of methanogens and methanotrophic bacteria were 46.76% and -6.33%, respectively. The explaining rate of methanogen diversity to methane emissions (78.4%) was higher than that of oxidizing bacterial diversity (54.5%), the relative abundance explained by the dominant genus of methanogens was 68.9%. 4) The structural equation model showed that methanogen diversity, methanotroph diversity, and soil moisture were the main factors controlling methane emissions, contributing 95.6%, 95.0%, and 91.2% to the variations of emissions, respectively. The contribution (73.1%一87.7%) of soil temperature and carbon and nitrogen components to the emission dynamics was ranked the second. Our results suggest that ant nesting mediates the seasonal dynamics of soil methane emissions, primarily through changing the diversity of methane-function microorganisms and soil water conditions. The research results deepen the understanding of the mechanism of biological regulation of methane emission in tropical forest soil.
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2024, Vol 35, Issue 6, p1695
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202406.032