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量子级联激光光谱在土壤生态系统中的应用 (封面文章)

Application of Quantum-Cascade Laser Spectroscopy to Soil Ecosystems (Cover Paper)

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摘要

土壤呼吸是地气间碳氮流通的主要途径。实时原位测量不同土壤生态环境下的气体排放,是研究大气温室气体形成、转移和消耗等动态过程的有力手段,可以为揭示碳氮生态系统循环与环境演化的主要过程及其驱动机制提供关键的科学依据。以室温连续量子级联激光器(RT-CW-QCL)作为激光光源,结合长程光学吸收池和直接吸收光谱探测技术,建立了一套高灵敏度、高精度的激光光谱系统,并以不同生态环境下的土壤样品为研究对象,开展了土壤和空气中CO、N2O气体交换过程的实时监测分析研究。实验结果表明:4种不同生态环境(芦苇丛、池塘、有机培土和草地)的土壤表现出不同的CO和N2O释放、吸收过程。

Abstract

Soil respiration is the main process of carbon and nitrogen circulation between the earth and atmosphere. Real-time in-situ measurement of gas emissions from different ecological soil environments is a powerful tool for studying the dynamic processes of atmospheric-greenhouse-gas formation, transfer, and consumption, which provides the key scientific basis for revealing the main processes of carbon and nitrogen ecosystem cycling and environmental evolution. In this paper, we describe the development of a laser-spectroscopy system based on a room-temperature, continuous-wave, quantum-cascade laser (RT-CW-QCL), a long-path optical-absorption cell, and a direct-absorption spectroscopic detection technology for the high-sensitivity and high-precision analysis of CO and N2O gas-exchange processes between soil samples under different ecological environments and ambient air. The results show that soil samples from four different ecological environments (i.e., reed, pond, organic, and grassland soils) exhibit visibly different CO and N2O release and absorption processes.

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中图分类号:O433.5+1

DOI:10.3788/AOS201939.1130001

所属栏目:光谱学

基金项目:国家自然科学基金、科技部国家重点研发计划;

收稿日期:2019-06-04

修改稿日期:2019-07-15

网络出版日期:2019-11-01

作者单位    点击查看

刘宁武:安徽大学物理与材料科学学院, 安徽 合肥 230601
许林广:安徽大学物理与材料科学学院, 安徽 合肥 230601
周胜:安徽大学物理与材料科学学院, 安徽 合肥 230601
何天博:安徽大学物理与材料科学学院, 安徽 合肥 230601
李劲松:安徽大学物理与材料科学学院, 安徽 合肥 230601

联系人作者:李劲松(ljs0625@126.com)

备注:国家自然科学基金、科技部国家重点研发计划;

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引用该论文

Liu Ningwu,Xu Linguang,Zhou Sheng,He Tianbo,Li Jingsong. Application of Quantum-Cascade Laser Spectroscopy to Soil Ecosystems[J]. Acta Optica Sinica, 2019, 39(11): 1130001

刘宁武,许林广,周胜,何天博,李劲松. 量子级联激光光谱在土壤生态系统中的应用[J]. 光学学报, 2019, 39(11): 1130001

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