福建师范大学黄锦学、刘源豪等研究人员揭示外源碳输入对常绿阔叶林土壤碳排放的影响

目前对葡萄糖输入后土壤CO₂排放动态特征的研究多集中在长期（60d以上）观察，对于短期内的变化研究较为缺乏。多数研究对于土壤CO₂排放的动态观测时间间隔较大。因此，探究短期内不同葡萄糖输入量对土壤CO₂排放的影响及其动态变化特征，对预测外源碳输入对土壤碳动态的影响具有重要意义。

注：图中不同小写字母表示不同处理间差异显著（P<0.05）

为了更好地研究外源葡萄糖输入量对土壤CO₂排放动态过程的影响及机理，福建师范大学黄锦学、刘源豪等研究人员以中亚热带常绿阔叶林土壤为研究对象，在培养温度为恒温20℃，土壤田间持水量60%的条件下，输入不同浓度的葡萄糖（碳含量分别为0、50、150、450μg·g^-1，分别标记为CK、C₁、C₂、C₃处理）进行室内培养试验，测定不同浓度葡萄糖输入下不同时间的土壤CO₂排放。

图2 预培养期间土壤CO₂排放速率和土壤CO₂累积排放量

图3 葡萄糖输入后土壤CO₂排放速率和土壤CO₂累积排放量的动态特征

注：*表示培养28h前后的土壤CO₂排放速率、土壤CO₂累积排放量差异显著（P<0.05）

研究结果表明，C₂、C₃处理的土壤CO₂排放速率和土壤CO₂累积排放量均显著升高（P<0.05）；C₂、C₃处理28h后，土壤CO₂排放速率随培养时间的延长显著升高（P<0.01），土壤CO₂累积排放量随培养时间的延长显著升高（P<0.01）；当培养时间超过65h后，C₁处理的土壤CO₂排放速率随培养时间的延长有显著降低的趋势（P<0.01），C₃处理的土壤C/N、DOC变化量较CK显著增大（P<0.05），土壤CO₂排放速率与C/N、DOC含量呈显著正相关关系（P<0.05）。不同浓度葡萄糖输入对土壤CO₂排放的影响有显著差异，在中亚热带常绿阔叶林土壤中，根系分泌物葡萄糖的输入增加可能会改变土壤C、N含量，提高CO₂排放量，从而进一步影响土壤C库的固存。

相关研究成果以“外源碳输入对常绿阔叶林土壤碳排放的影响”为题发表于期刊《Journal of Forest & Environment》上。

相关论文信息：刘源豪, 熊德成, 吴晨, 等. 外源碳输入对常绿阔叶林土壤碳排放的影响[J]. Journal of Forest & Environment, 2023, 43(5).

DOI:10.13324/j.cnki.jfcf.2023.05.006

@各位老师：

截至目前，以PRI-8800为关键设备发表的相关文章已达25篇，分别发表在10余种影响因子较高的国际期刊上——

数据来源：https://sci.justscience.cn/

很荣幸PRI-8800可以为这些高质量学术研究贡献一份力量，感谢各位老师对普瑞亿科产品的支持和信任。如果您成功发表文章，并且在研究过程中使用了普瑞亿科的国产仪器设备，请与我们公司联络，我们为您准备了一份小礼物，以感谢您对国产设备以及普瑞亿科的信任和支持！

为响应国家“双碳”目标，针对国内“双碳”行动有效性评估，普瑞亿科全新升级了PRI-8800 全自动变温培养土壤温室气体在线测量系统，结合了连续变温培养和高频土壤呼吸在线测量的优势，模式的培养与测试过程非常简单高效，这极大方便了大量样品的测试或大尺度联网的研究，可以有效服务科学研究和生态观测。PRI-8800的成功推出，为“双碳”目标研究和评价提供了强有力的工具。

PRI-8800是如何工作的？

01

主要特点

• 可设定恒温或变温培养模式；

• 温度控制波动优于±0.05℃；

• 平均升降温速率不小于1°C/min；

• 150ml样品瓶，25位样品盘；

• 大气本底缓冲气或钢瓶气清洗气路；

• 一体化设计，内置CO₂ H₂O模块；

• 可外接高精度浓度或同位素分析仪。

02

选型推荐

为了更好地助力科学研究，拓展设备应用场景，普瑞亿科重磅推出「加强版」PRI-8800——PRI-8800 Plus全自动变温培养土壤温室气体在线测量系统。

03

实验设计

04

相关文献发表

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2023-11-14