Articles

The Response of Desert Plant Species Diversity to the Changes in Soil Water Content in the Middle-lower Reaches of the Heihe River

  • LI Xinrong ,
  • JIA Rongliang ,
  • HE Mingzhu
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  • Shapotou Desert Research and Experiment State Key Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China

Received date: 2008-05-14

  Revised date: 2008-06-10

  Online published: 2008-07-10

Abstract

Based on the investigation for vegetation and soil habitat in the desert areas in the middle-lower reaches of the Heihe River, the relationship between the distribution of vascular plant and cryptogam species diversity and the variation of soil water contents has been studied. Species diversity was presented by species richness and species abundance. Soil water contents in the different investigative plots were used to present the characteristics of ecohydrological processes in the study areas. Our results show that the effects of the shallow soil water on the diversity of herbaceous species, in particular, on species diversity of annual plants and ephemeral plants are much more significant than that on woody species. The woody species diversity is mainly depends on the deeper soil water contents. Cryptogamic diversity is closely associated with the soil shallow water content. The higher soil water contents are beneficial to the development and colonization of cryptogamic diversity, dominated by mosses and lichen. However, the lower soil water contents are favorable for developing cryptogamic diversity characterized by cyanobacteria and desert algae. The maintaining of cryptogamic diversity improved the habitat for development of species diversity of vascular plants in arid regions. In addition, the distribution of plant species is also regulated by biological traits of these plants, such as psammophytic and halophytic species. The effects of decreasing of soil water on species abundance are more obvious than that on species richness. In general, soil water contents of plots not only directly influence plant species diversity, but indirectly act on it through re-allocation of soil sources availability by soil water. Therefore, it will be a great challenge for biodiversity conservation how to maintain a relatively stable soil water in the middle-lower reaches of the Heihe River.

Cite this article

LI Xinrong , JIA Rongliang , HE Mingzhu . The Response of Desert Plant Species Diversity to the Changes in Soil Water Content in the Middle-lower Reaches of the Heihe River[J]. Advances in Earth Science, 2008 , 23(7) : 685 -691 . DOI: 10.11867/j.issn.1001-8166.2008.07.0685

References

[1] Hooper D UChapin F SEwel J Jet al. Effects of biodiversity on ecosystem functioning: A consensus of current knowledge [J]. Ecological Monography200575: 3-5.

[2] Cottingham K LBrown B LLennon J T. Biodiversity may regulate the temporal variability of ecological systems [J]. Ecology Letter20014: 72-85.

[3] Naeem SThompson L JLawton J Het al. Declining biodiversity can alterthe proformance of ecosystems [J]. Nature1994368:734-736.

[4] Timan D. The ecological consequences of changes in biodiversity: Asearch for general principles [J]. Ecology199980:1 455-1 474.

[5] Li XinrongWang Tao. Study on sandland ecosystems [C]Trend and Review for Ecological Research. Beijing: Meteorologial Press2004625-649.[李新荣,王涛. 沙地生态系统研究[C]生态学研究回顾与展望.北京: 气象出版社,2004625-649.]

[6] Li X RChen Y WYang L W. Cryptogam diversity and formation of soil crusts in temperate desert [J]. Annals of Arid Zone200443: 335-353.

[7] Liu GuangsongJiang NenghuiZhang Liandiet al. Soil Profile Description and Physicochemical Properties Analysis [M]. Beijing: Chinese Standard Press1996. [刘光崧,蒋能慧,张连第,等.土壤理化分析与剖面描述[M]. 北京:中国标准出版社,1996.]

[8] Lu QiLi XinrongXiao Honglang. The Observation Methods for Desert Ecosystems [M]. Beijing: Chinese Environmental Press2004.[卢琦,李新荣,肖洪浪.荒漠生态系统观测方法[M].北京: 中国环境科学出版社,2004.]

[9] Li X RJia X HLong L Qet al. Effects of biological soil crusts on seed bankgermination and establishment of two annual plant species in the Tengger desertN China[J]. Plant and Soil2005277: 375-385.

[10] Fox J W. Using the price equation to partition the effects of biodiversity loss on ecosystem function [J]. Ecology200687: 2 687-2 696.

[11] Whitford W G. Ecology of Desert Ecosystems [M]. New York: Academic Press2002.

[12] Liu Jiaqiong. The comparison study on xerophytic structure and water regime of the different plant ecotypes in the middle parts of Chinese sandy desert [J]. Acta of Botanica Sinica198729: 662-673.[刘家琼. 我国沙漠中部地区主要不同生态类型植物的水分关系和旱生结构比较研究[J].植物学报,198729: 662-673.]

[13] Belnap JLange O L. Biological Soil Crusts: StructureFunctionand Management [M]. Berlin:Springer2003.

[14] Li X RWang X PLi T. Microbiotic crust and its effect on vegetation and habitat on artificially stabilized desert dunes in Tengger DesertNorth China [J]. Biology and Fertility of Soils200235: 147-154.

[15] Lundholm J TLarson D W. Relationships between spatial environmental heterogeneity and plant species diversity on a limestone pavement [J]. Ecography200326: 715-722.

[16] Li X R. Influence of variation of soil spatial heterogeneity on vegetation restoration [J]. Science in ChinaSeries D),200548: 2 020-2 031.

[17] He M ZZheng J GLi X R. Environmental factors affecting vegetation composition in Alxa PlateauChina [J]. Journal of Arid Environments200769: 473-489.

[18] Schulze E DBeck EMuller-hohenstein K. Plant Ecology [M]. BerlinHeidelberg: Springer2005.

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