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The vertical microdistribution of cyanobacteria and green algae within desert crusts and the development of the algal crusts
Chunxiang Hu; Delu Zhang; Zebo Huang; Yongding Liu; Liu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
2003
Source PublicationPLANT AND SOIL
Volume257Issue:1Pages:97-111
AbstractSubstantial amounts of algal crusts were collected from five different desert experimental sites aged 42, 34, 17, 8 and 4 years, respectively, at Shapotou ( China) and analyzed at a 0.1 mm microscale of depth. It was found that the vertical distribution of cyanobacteria and microalgae in the crusts was distinctly laminated into an inorganic-layer (ca. 0.00 - 0.02 mm, with few algae), an algae-dense-layer ( ca. 0.02 - 1.0 mm) and an algae-sparse-layer ( ca. 1.0 - 5.0 mm). It was interesting to note that in all crusts Scytonema javanicum Born et Flah ( or Nostoc sp., cyanobacterium), Desmococcus olivaceus (Pers ex Ach., green alga) Laundon and Microcoleus vaginatus Gom. ( cyanobacterium) dominated at the depth of 0.02 - 0.05, 0.05 - 0.1 and 0.1 - 1.0 mm, respectively, from the surface. Phormidium tenue Gom. ( or Lyngbya cryptovaginatus Schk., cyanobacterium) and Navicula cryptocephala Kutz.( or Hantzschia amphioxys (Ehr.) Grun. and N. cryptocephala together, diatom) dominated at the depth of 1.0 - 3.0 and 3.5 - 4.0 mm, respectively, of the crusts from the 42 and 34 year old sites. It was apparent that in more developed crusts there were more green algae and the niches of Nostoc sp., Chlorella vulgaris Beij., M. vaginatus, N. cryptocephala and fungi were nearer to the surface. If lichens and mosses accounted for less than 41.5% of the crust surface, algal biovolume was bigger when the crust was older, but the opposite was true when the cryptogams other than algae covered more than 70%. In addition to detailed species composition and biovolume, analyses of soil physicochemical properties, micromorphologies and mineral components were also performed. It was found that the concentration of organic matter and nutrients, electric conductivity, silt, clay, secondary minerals were higher and there were more micro-beddings in the older crusts than the less developed ones. Possible mechanisms for the algal vertical microdistribtion at different stages and the impact of soil topography on crust development are discussed. It is concluded that biomethods ( such as fine species distribution and biovolume) were more precise than mineralogical approaches in judging algal crust development and thus could be a better means to measure the potentiality of algal crusts in desert amelioration.
KeywordAlgal Crust Desert Development Fine Structure Vertical Distribution
DepartmentChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; NW Normal Univ, Coll Life Sci, Lanzhou 730070, Peoples R China
Subject AreaAgronomy ; Plant Sciences ; Soil Science
Indexed BySCI
WOS IDWOS:000186046200010
Citation statistics
Cited Times:86[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9628
Collection期刊论文
Corresponding AuthorLiu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Chunxiang Hu,Delu Zhang,Zebo Huang,et al. The vertical microdistribution of cyanobacteria and green algae within desert crusts and the development of the algal crusts[J]. PLANT AND SOIL,2003,257(1):97-111.
APA Chunxiang Hu,Delu Zhang,Zebo Huang,Yongding Liu,&Liu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China.(2003).The vertical microdistribution of cyanobacteria and green algae within desert crusts and the development of the algal crusts.PLANT AND SOIL,257(1),97-111.
MLA Chunxiang Hu,et al."The vertical microdistribution of cyanobacteria and green algae within desert crusts and the development of the algal crusts".PLANT AND SOIL 257.1(2003):97-111.
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