Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (5): 894-903.DOI: 10.11733/j.issn.1007-0435.2021.05.005

Previous Articles     Next Articles

Changes of CO2 Fluxes and Chlorophyll Fluorescence Parameters of Biological Soil Crusts in a 19-year Artificial Grassland in the Source Zone of the Yellow River

SUN Hua-fang1, LI Xi-lai1, LI Cheng-yi1, ZHANG Jing1, LIN Chun-ying1,2, JIN Li-qun1,3, YANG Xin-guang4   

  1. 1. College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China;
    2. Qinghai Province Weather Modification Office, Xining, Qinghai Province 810001, China;
    3. Grassland station of Huangyuan County, Xining, Qinghai Province 812100, China;
    4. College of Ecological Environment and Resources, Qinghai University for Nationalities, Xining, Qinghai Province 810007, China
  • Received:2020-10-17 Revised:2020-12-03 Online:2021-05-15 Published:2021-06-02

黄河源区建植19年人工草地生物结皮CO2通量与叶绿素荧光参数的变化

孙华方1, 李希来1, 李成一1, 张静1, 林春英1,2, 金立群1,3, 杨鑫光4   

  1. 1. 青海大学农牧学院, 青海 西宁 810016;
    2. 青海省人工影响天气办公室, 青海 西宁 810001;
    3. 湟源县草原站, 青海 西宁 812100;
    4. 青海民族大学生态环境与资源学院, 青海 西宁 810007
  • 通讯作者: 李希来,E-mail:xilai-li@163.com
  • 作者简介:孙华方(1991-),女,汉族,山东东明人,博士研究生,主要从事草地生态与环境保护方面的研究,E-mail:1219493914@qq.com
  • 基金资助:
    青海省科技厅项目(2020-ZJ-904);国家自然科学基金项目(31872999);三江源国家公园联合研究专项(LHZX-2020-08);高等学校学科创新引智计划资助(D18013)项目;教育部长江学者和创新团队发展计划(IRT_17R62)资助

Abstract: To understand the variation of CO2 release and carbon fixation in different BSCs and vegetation communities in artificial grassland,and to explore the factors influencing CO2 release and photosynthesis of BSCs,we measured CO2 fluxes and chlorophyll fluorescence parameters of different BSCs in a 19-year-old artificial grassland,vegetation and soil characteristics were also investigated at the same time. The results showed that CO2 flux of algal and lichen crusts was significantly lower than that of moss (10.58 μmol·m-2·s-1)(P<0.05). The CO2 flux of the vegetation community was 11.55 μmol·m-2·s-1 in moss crust stage,which was significantly lower than that in algal and lichen crusts (P<0.05). The CO2 flux of the soil covered by algae and lichen crusts was significantly higher than that of moss crusts in soil CO2 fluxes test (about 2 times,P<0.05). For chlorophyll fluorescence,the parameters F0 and Fm of moss were the highest. Algal and moss had a higher Fv/Fm than lichen. Redundancy Analysis (RDA) showed that the CO2 fluxes and chlorophyll fluorescence were positively correlated with the height of grass and NH+4-N content,but negatively correlated with pH. Thus,it is important to consider the contribution of BSCs to the variability of CO2 fluxes and chlorophyll fluorescence in different successional stages.

Key words: CO2 fluxes, Chlorophyll fluorescence, BSCs successional stage, Vegetation characteristics, Soil properties, Redundancy analysis

摘要: 为了解黄河源人工草地不同类型生物结皮和植被群落CO2释放和固定的变化特征,并探讨二者的影响因子,本文通过调查黄河源建植19年人工草地不同类型生物结皮CO2通量和植被土壤特征变化发现:藻和地衣结皮CO2通量均显著小于苔藓结皮(10.58 μmol·m-2·s-1)(P<0.05);苔藓结皮对应的植被群落CO2通量(11.55 μmol·m-2·s-1)显著低于藻和地衣结皮(P<0.05);藻和地衣结皮下的土壤CO2通量显著大于苔藓结皮(约2倍,P<0.05)。苔藓结皮叶绿素初始荧光参数F0(Minimal Fluorescence)和最大荧光参数Fm(Maximal Fluorescence)均最大;藻和苔藓结皮的PS Ⅱ最大光化学量子产量Fv/Fm(Optimal/Maximal Quantum Yield of PS Ⅱ)均高于地衣结皮。CO2通量和叶绿素荧光参数的主要影响因子相似,均与禾本科高度、土壤铵态氮含量正相关,与pH负相关。因此,在研究草地碳平衡过程中应充分考虑生物结皮的贡献,同时需注意不同类型的生物结皮的CO2通量和叶绿素荧光参数的差异变化。

关键词: CO2通量, 叶绿素荧光, BSCs演替阶段, 植被特征, 土壤性质, 冗余分析

CLC Number: