收藏设为首页 广告服务联系我们在线留言

干旱区地理 ›› 2014, Vol. 37 ›› Issue (3): 555-560.

• 生物与环境 • 上一篇    下一篇

非生物过程对盐碱土土壤CO2通量的影响

马杰1,2,王忠媛1,2,3,唐立松1,2,王玉刚1,2   

  1. (1    中国科学院新疆生态与地理研究所,荒漠与绿洲国家重点实验室, 新疆    乌鲁木齐    830011;2   中国科学院阜康荒漠生态系统国家站, 新疆    阜康    831505;    3    中国科学院大学, 北京    100049)
  • 收稿日期:2013-07-05 修回日期:2013-09-04 出版日期:2014-05-25
  • 通讯作者: 唐立松,研究员,博士生导师. Email:tangls@ms.xjb.ac.cn
  • 作者简介:马杰(1983-),男(回族),新疆乌鲁木齐人,在读硕士生,主要从事干旱区生态系统碳循环的研究. Email:xiaoshu106116@sina.com
  • 基金资助:

    国家国际科技合作项目(2011DFA31070);国家自然科学基金项目(41301279)

Effect of soil abiotic processes on soil CO2 flux in saline/alkaline soils

MA  Jie1,2,WANG  Zhong-yuan1,2,3,TANG  Li-song1,2,WANG  Yu-gang1,2   

  1. (1   State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi  830011, Xinjiang, China;   2   Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang  831505, Xinjiang, China;3   University of Chinese Academy of Sciences, Beijing  100049, China)
  • Received:2013-07-05 Revised:2013-09-04 Online:2014-05-25

摘要: 从原位土壤CO2通量的观测数据出发,分析了盐生荒漠土壤CO2通量的日、季节变化特征,并针对夜晚负通量的发生,结合灭菌控制实验,定量拆分土壤CO2通量中生物与非生物组分的贡献。结果表明:多枝柽柳冠下土壤CO2通量在整个生长季均显著的高于灌间空地通量(P<0.05),而受双峰日过程影响,冠下和灌间空地土壤CO2通量的季节变化均不明显。但灌间空地土壤CO2通量在夜间表现为负值(CO2由大气进入土壤),原因就在于土壤非生物过程的存在。当土壤含水量为10%时,非生物通量对总通量的贡献介于18.6%~49.2%之间,并随着土壤pH的增加呈线性上升的趋势;相比之下,在风干土中,非生物通量与总通量没有显著的差异,说明土壤越干,非生物过程的影响越大。因此,土壤pH和水分含量是土壤非生物通量的重要影响因子,而非生物过程对土壤CO2通量的影响不容忽视。

关键词: 土壤CO2通量, 生物过程(通量), 非生物过程(通量), pH, 土壤含水量

Abstract: As the important component of the ecosystem respiration,knowledge of soil CO2 flux is essential for understanding the global carbon dynamics under future climate scenarios. But studies on soil CO2 flux in saline desert ecosystems are scarce compared to their broad distribution. Therefore, based on the in situ measurement of soil CO2 flux,the paper analyzed the diurnal and seasonal variation of soil CO2 flux at a saline desert. Particularly aiming to the negative flux(CO2 enters rather than releasing from the ground),autoclaving treatment was used to partitioning soil total CO2 flux into biotic and abiotic component at four different saline/alkaline soils. The results show that soil CO2 flux under the canopy are significantly higher than that in inter-plant spaces (P<0.05). The soil CO2 flux,neither under the canopy nor in inter-plant spaces,exhibited any obvious seasonal variations because of the bi-modal diurnal patterns,which were probably caused by the inhibition of microbial activity by extremely high temperature. Specially,soil CO2 flux in inter-plant spaces exhibited negative flux,which means CO2 enters rather than releasing from the soil surface,the reason of which was the abiotic processes. When soil water content equals 10%,the contribution of abiotic flux to soil total CO2 flux ranged from 18.6% to 49.2%,with a linearly increasing trend with increasing pH,by contrast,soil abiotic component is predominant in air-dried soil. Thus,soil pH and soil water content has great effect on soil abiotic flux,which must be a substantial component of soil CO2 flux in saline/alkaline soils.

Key words: soil CO2 flux, biotic process (flux), abiotic process (flux), pH, soil water content

中图分类号: 

  • S154.1