大气CO2浓度缓增对冬小麦土壤呼吸的影响
DOI:
作者:
作者单位:

南京信息工程大学应用气象学院

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学(42071023,41775152)


Effects of gradual increase of atmospheric CO2 concentration on soil respiration of winter wheat field
Author:
Affiliation:

1.School of Applied Meteorology, Nanjing University of Information Science &2.Technology,

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为研究大气CO2浓度缓增对冬小麦(Triticum aestivum)土壤呼吸的影响,基于开顶式气室组成的CO2浓度自动调控平台,在2017?2019年开展了两季冬小麦CO2浓度缓增试验。每季试验在背景大气CO2浓度基础上(CK,对照),均设置了CO2浓度缓增处理(C80和C120,即从2016年起逐年增加40 μmol·mol?1,至2017?2018年和2018?2019年冬小麦生长季CO2浓度分别为CK+80 μmol·mol?1和CK+120 μmol·mol?1)。采用静态暗箱?气相色谱法测定土壤呼吸速率。结果表明:CO2浓度缓增没有显著改变土壤呼吸的季节变化规律,但是会显著影响冬小麦旺盛生长期的土壤呼吸速率。在2018?2019年冬小麦抽穗?扬花期,C120处理使土壤呼吸速率显著增加50.2%(P=0.008),且使得整个生育期土壤碳排放显著增加25.9%(P=0.044),而在2017?2018年冬小麦生长季,与CK相比,C80处理对土壤呼吸没有显著影响。土壤呼吸与土壤温湿度分别存在指数正相关和线性负相关关系。与CK相比,CO2浓度缓增降低了土壤呼吸温度敏感性系数Q10值。研究表明,CO2浓度缓增到120 μmol·mol?1增加了冬小麦生长季土壤碳排放。

    Abstract:

    To examine the effects of gradual increase of atmospheric CO2 concentration on soil respiration of winter wheat (Triticum aestivum) field, a gradually increased CO2 concentration experiment was conducted with automatic control system of CO2 in open top chambers (OTCs) during 2017?2019 growing seasons. In this study, a gradual increase of atmospheric CO2 concentration (C80 and C120, an increase of 40 μmol·mol?1 year by year from 2016) was set up based on the ambient atmospheric CO2 concentration (CK). The soil respiration rate (Rs) was measured by the static chamber?gas chromatograph method. The results showed that gradually increased CO2 did not alter the seasonal patterns of soil respiration, but had significant effect on Rs during winter wheat bloom?growth period. In 2018?2019 growing season, compared to CK, C120 treatment significantly increased Rs by 50.2% (P=0.008) at the heading?flowering stage, and significantly increased cumulative amount of CO2 emissions (CAC) by 25.9% (P=0.044) during the wheat growing season, but in 2017?2018 growing season, compared to CK, C80 treatment had no significant effect on Rs. Soil respiration showed a positive exponential and negative linear correlation with the soil temperature and soil moisture, respectively. Compared to CK, gradually increased CO2 concentration reduced the temperature sensitivity coefficient of soil respiration (Q10 values). In summary, a gradual increase of atmospheric CO2 concentration to 120 μmol·mol?1 increased CAC during the growing season of winter wheat.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-08-23
  • 最后修改日期:2022-09-30
  • 录用日期:2022-10-06
  • 在线发布日期:
  • 出版日期:

地址:江苏南京,宁六路219号,南京信息工程大学    邮编:210044

联系电话:025-58731025    E-mail:nxdxb@nuist.edu.cn

南京信息工程大学学报 ® 2022 版权所有  技术支持:北京勤云科技发展有限公司