地理科学进展 ›› 2003, Vol. 22 ›› Issue (2): 170-176.doi: 10.11820/dlkxjz.2003.02.009

• 论文 • 上一篇    下一篇

土壤CO_2浓度昼夜变化及其对土壤CO_2排放量的影响

梁福源, 宋林华, 王静   

  1. 中国科学院地理科学与资源研究所,北京100101
  • 收稿日期:2002-11-01 修回日期:2003-01-01 出版日期:2003-03-25 发布日期:2011-04-14
  • 作者简介:梁福源(1975-),男,博士研究生。1997年毕业于长春地质学院地质系。主要从事喀斯特地貌和风景地学研究。
  • 基金资助:

    国家自然科学基金(90202017,410071017):石林研究基金(199903)资助

Diurnal Variation of Soil CO_2 Concentration and Its Relationship with Soil CO_2 Flux

LIANG Fuyuan, SONG Linhua, WANG Jing   

  1. Institute of geographic sciences and natural resources research, CAS, Beijing 100101
  • Received:2002-11-01 Revised:2003-01-01 Online:2003-03-25 Published:2011-04-14

摘要: 对石林地区两个研究点土下20、40和60cm土壤CO2浓度和土壤CO2排放量的昼夜变化进行的研究表明二者之间具有一定的正相关关系,因此土壤CO2排放量除受环境因子影响之外,还受土壤CO2浓度所控制。土壤CO2浓度和土壤CO2排放量之间的相关关系可以用来解释土壤有机碳含量及温度对土壤CO2排放量的影响,即土壤有机碳含量高和温度升高是通过影响土壤空气中CO2的形成速率,导致土壤CO2浓度升高,从而促进土壤CO2的排放。

关键词: 土壤CO2浓度, 土壤CO2排放, 相关关系

Abstract: Diurnal variation of soil CO2 concentration and flux of red soil and their relationship were studied in June of 2002 in Shilin national park,Yunnan provice. Study shows that in different depth, soil CO2 shows fluctuation during 24 hours. From 18:00 to 22:00, concentration of soil CO2 decreases (for example, at subsoil 20cm, soil CO2 concentration decreases from 0.48% at 18:00 to 0.43% at 22:00). From 22:00 o’clock to next 6:00 o’clock, soil CO2 concentration shows a minor fluctuation, and reaches the minimum at 6:00 o’clock. During daytime, from 6:00 to 18:00, soil CO2 concentration increases steadily and at 16:00 o’clock, it reaches the maximum of the whole day. Then it begins to fall down. In site A, soil CO2 concentration increases with soil depth. But it is a different case in site A’ because of the disruption of the soil, which doesn’t shows the same variation. Sometimes soil CO2 concentration at 20cm depth is greater than that of at 60cm depth. Study result also shows that soil CO2 flux coincides with soil CO2 concentration at 20cm, 40cm and 60cm. Soil CO2 concentration and flux is higher during daytime than that of night. The positive relationship between soil CO2 content and soil CO2 flux gives good explanation to the relationship between the soil organic carbon content, temperature with soil CO2 flux. Soil CO2 concentration in different soil depth increase with higher production of soil CO2 because of higher soil organic carbon content and increasing temperature. As this study shows, Soil CO2 flux will increase when soil CO2 concentration increases.

Key words: Relationship, Soil CO2 concentration, Soil CO2 flux

中图分类号: 

  • S152.6