亚热带森林土壤团聚体呼吸作用对温度的响应

doi:10.13292/j.1000-4890.202502.040

生态学杂志 ›› 2025, Vol. 44 ›› Issue (2): 406-416.doi: 10.13292/j.1000-4890.202502.040

亚热带森林土壤团聚体呼吸作用对温度的响应

白雪^1,2,梁丹萍²,陈浏寰^1,2,颜湘婷²,赵玉姣²,梁建宏^3,4,朱婧^1,2*

（¹珍稀濒危动植物生态与环境保护教育部重点实验室，广西师范大学，广西桂林 541006； ²广西师范大学环境与资源学院，广西桂林 541006； ³中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室，广西桂林 541004； ⁴自然资源部地球化学探测重点实验室，中国地质科学院地球物理地球化学勘查研究所，河北廊坊 065000）

出版日期:2025-02-10 发布日期:2025-02-10

Response of respiration of soil aggregates to temperature in subtropical forests.

BAI Xue^1,2, LIANG Danping², CHEN Liuhuan^1,2, YAN Xiangting², ZHAO Yujiao², LIANG Jianhong^3,4, ZHU Jing^1,2*

(¹Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of Education, Guangxi Normal University, Guilin 541006, Guangxi, China; ²College of Environment and Resources, Guangxi Normal University, Guilin 541006, Guangxi, China; ³Institute of Karst Geology, Chinese Academy of Geological Sciences/Key Laboratory of Karst Dynamics, Ministry of Natural Resources/Guangxi Zhuang Autonomous Region, Guilin 541004, Guangxi, China; ⁴Key Laboratory of Geochemical Exploration, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China).

Online:2025-02-10 Published:2025-02-10

摘要/Abstract

摘要：

为探究我国亚热带森林不同土壤团聚体呼吸速率的差异及其对温度变化的响应，本研究以碳酸盐岩发育的中性石灰土和花岗碎屑岩发育的酸性红壤为对象，针对不同粒径的团聚体（0.106～0.25、0.25～0.5和0.5～2 mm），在不同温度下（5、15、25、35 ℃）测定第1、3、7、10、13、17和21天培养时间的土壤呼吸速率，分析土壤呼吸累积速率、土壤呼吸作用贡献率及土壤呼吸温度敏感性（Q₁₀）在不同温度及团聚体尺度的差异特征及主要影响因子。结果表明，石灰土O/A层和AB层的累积呼吸速率总体上高于红壤，不同温度区间土壤累积呼吸速率的影响因子不同：在15～35 ℃时，土壤有机碳（TOC）、总氮（TN）、总磷（TP）和C/N是主要影响因子，5 ℃时则是pH值和C/N。在团聚体尺度上，在相同温度时石灰土和红壤各粒级团聚体之间的累积呼吸速率均无显著性差异。石灰土不同团聚体Q₁₀值均大于红壤，但石灰土与红壤的Q₁₀值在各自的团聚体尺度均无显著性差异。红壤O/A层、石灰土O/A层和AB层的大团聚体呼吸贡献率最大，而红壤AB层团聚体的呼吸贡献率则与之相反。本研究揭示了亚热带森林中性石灰土相比酸性红壤的土壤呼吸对未来全球变暖的正反馈响应更为显著，须重视亚热带森林石灰性土壤在全球变化背景下碳平衡中的贡献。

关键词: 亚热带森林, 岩溶, 土壤呼吸, 团聚体, 温度敏感性（Q₁₀）

Abstract: We explored the differences in respiration rates of soil aggregates in different soil types in subtropical forests in China and their response to temperature changes, by focusing on neutral limestone soil developed from carbonate rocks and acidic red soil developed from granite cataclasite. The respiration rates of soil aggregates with different sizes (0.106-0.25, 0.25-0.5, and 0.5-2 mm) were measured at different temperatures (5, 15, 25, 35 ℃) after 1, 3, 7, 10, 13, 17, and 21 days of incubation. The cumulative respiration rate, contribution rate of soil respiration, and its temperature sensitivity (Q₁₀) were estimated to examine the differences and main controlling factors at different temperatures and aggregate scales. The results showed that the cumulative respiration rates of the O/A horizon and AB horizon of limestone soil were generally higher than that of red soil. The influencing factors of soil cumulative respiration rate in different temperature ranges were different. Organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), and C/N were the main factors at 15-35 ℃, while pH and C/N were the main factors at 5 ℃. At the aggregate scale, there was no significant difference in the cumulative respiration rates among different aggregate classes of limestone soil and red soil at the same temperature. The Q₁₀ values of different aggregates in limestone soil were higher than those in red soil. There was no significant difference among individual aggregate classes of limestone soil and red soil. The contribution rate of respiration of large aggregates was the largest in the O/A horizon of red soil as well as the O/A horizon and AB horizon of limestone soil, while that in the AB horizon of red soil was the opposite. This study revealed that compared to the acidic red soil, the respiration rate of limestone soil in subtropical forest ecosystems showed more significant positive feedback to future global warming, highlighting the need to emphasize its contribution to global carbon balance.

Key words: subtropical forest, karst, soil respiration, aggregate, temperature sensitivity (Q₁₀)

白雪, 梁丹萍, 陈浏寰, 颜湘婷, 赵玉姣, 梁建宏, 朱婧. 亚热带森林土壤团聚体呼吸作用对温度的响应[J]. 生态学杂志, 2025, 44(2): 406-416.

BAI Xue, LIANG Danping, CHEN Liuhuan, YAN Xiangting, ZHAO Yujiao, LIANG Jianhong, ZHU Jing. Response of respiration of soil aggregates to temperature in subtropical forests.[J]. Chinese Journal of Ecology, 2025, 44(2): 406-416.

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亚热带森林土壤团聚体呼吸作用对温度的响应

Response of respiration of soil aggregates to temperature in subtropical forests.

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