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(Q_(10))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Q_(10)值均大于红壤,但石灰土与红壤的Q_(10)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。
We explored the differences in respiration rates of soil aggregates in different soil types in subtropical for⁃ests in China and their response to temperature changes,by focusing on neutral limestone soil developed from car⁃bonate rocks and acidic red soil developed from granite cataclasite.The respiration rates of soil aggregates with dif⁃ferent 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(Q_(10))were estimated to examine the differences and main control⁃ling 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 nitro⁃gen(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 Q_(10) values of different aggregates in limestone soil were higher than those in red soil.There was no significant difference among individual ag⁃gregate 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 ho⁃rizon 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.
作者
白雪
梁丹萍
陈浏寰
颜湘婷
赵玉姣
梁建宏
朱婧
BAI Xue;LIANG Dan-ping;CHEN Liuhuan;YAN Xiangting;ZHAO Yujiao;LIANG Jianhong;ZHU Jing(Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of Education,Guangxi Normal University,Guilin 541006,Guangxi,China;College of Environment and Resources,Guangxi Normal University,Guilin 541006,Guangxi,China;Institute 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;Key Laboratory of Geochemical Exploration,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,Hebei,China)
出处
《生态学杂志》
北大核心
2025年第2期406-416,共11页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41967005)
广西自然科学基金项目(2020GXNSFBA159029)
广西高校引进海外高层次人才百人计划专项经费
自然资源部地球化学探测重点实验室开放基金课题(AS2019P02)资助。
