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Small-Scale Spatial Heterogeneity of Photosynthetic Fluorescence Associated with Biological Soil Crust Succession in the Tengger Desert, China
Lan, Shubin1,2; Thomas, Andrew David2; Tooth, Stephen2; Wu, Li2,3; Hu, Chunxiang1
2019-11-01
Source PublicationMICROBIAL ECOLOGY
ISSN0095-3628
Volume78Issue:4Pages:936-948
Abstract

In dryland regions, biological soil crusts (BSCs) have numerous important ecosystem functions. Crust species and functions are, however, highly spatially heterogeneous and remain poorly understood at a range of scales. In this study, chlorophyll fluorescence imaging was used to quantify millimeter-scale patterns in the distribution and activity of photosynthetic organisms in BSCs of different successional stages (including cyanobacterial, lichen, moss three main successional stages and three intermixed transitional stages) from the Tengger Desert, China. Chlorophyll fluorescence images derived from the Imaging PAM (Pulse Amplitude Modulation) showed that with the succession from cyanobacterial to lichen and to moss crusts, crust photosynthetic efficiency (including the maximum and effective photosynthetic efficiency, respectively) and fluorescence coverage increased significantly (P < 0.05), and that increasing photosynthetically active radiation (PAR) reduced the effective photosynthetic efficiency (Yield). The distribution of photosynthetic organisms in crusts determined Fv/Fm (ratio of variable fluorescence to maximum fluorescence) frequency pattern, although the photosynthetic heterogeneity (SHI index) was not significantly different (P > 0.05) between cyanobacterial and moss crusts, and showed a unimodal pattern of Fv/Fm values. In contrast, photosynthetic heterogeneity was significantly higher in lichen, cyanobacteria-moss and lichen-moss crusts (P < 0.05), with a bimodal pattern of Fv/Fm values. Point pattern analysis showed that the distribution pattern of chlorophyll fluorescence varied at different spatial scales and also among the different crust types. These new results provide a detailed (millimeter-scale) insight into crust photosynthetic mechanisms and spatial distribution patterns associated with their community types. Collectively, this information provides an improved theoretical basis for crust maintenance and management in dryland regions.

KeywordDrylands Biological soil crusts Chlorophyll fluorescence Photosynthesis Heterogeneity Succession
DOI10.1007/s00248-019-01356-0
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Marine & Freshwater Biology ; Microbiology
WOS SubjectEcology ; Marine & Freshwater Biology ; Microbiology
WOS IDWOS:000495294900014
WOS KeywordRECOVERY RATES ; PHOTOSYSTEM-II ; ALGAL CRUSTS ; CYANOBACTERIAL ; PATTERNS ; INSIGHTS ; CARBON ; NEGEV ; TREES
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/35329
Collection藻类生物学及应用研究中心_期刊论文
Corresponding AuthorHu, Chunxiang
Affiliation1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Hubei, Peoples R China
2.Aberystwyth Univ, Dept Geog & Earth Sci, Aberystwyth SY23 3DB, Dyfed, Wales
3.Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Lan, Shubin,Thomas, Andrew David,Tooth, Stephen,et al. Small-Scale Spatial Heterogeneity of Photosynthetic Fluorescence Associated with Biological Soil Crust Succession in the Tengger Desert, China[J]. MICROBIAL ECOLOGY,2019,78(4):936-948.
APA Lan, Shubin,Thomas, Andrew David,Tooth, Stephen,Wu, Li,&Hu, Chunxiang.(2019).Small-Scale Spatial Heterogeneity of Photosynthetic Fluorescence Associated with Biological Soil Crust Succession in the Tengger Desert, China.MICROBIAL ECOLOGY,78(4),936-948.
MLA Lan, Shubin,et al."Small-Scale Spatial Heterogeneity of Photosynthetic Fluorescence Associated with Biological Soil Crust Succession in the Tengger Desert, China".MICROBIAL ECOLOGY 78.4(2019):936-948.
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