Co-existence mechanisms of plant species within “soil islands” habitat of desert steppe

SONG Naiping 1 WANG Xing 1 CHEN Lin 1 XUE Yi 1 CHEN Juan 1 SUI Jinming 1 WANG Lei 1 YANG Xinguo 1

(1.Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan 750021)

【Abstract】Extensive fragmentation has led to the original desert steppe soils of hard sierozem to become isolated in the desertified lands, forming the so-called “soil islands”. We aimed to reveal the effect of fragmentation on the co-existence of plant species within “soil island” habitat. To this end, we characterized the plant communities on three large (200–300 m2), medium (about 100 m2) and small (about 50 m2) soil islands each, in the Wanjigou Village of Yanchi County in Ningxia Hui Autonomous Region of China. We analyzed the similarity of plant communities within and outside those soil islands, the breadth and overlap of plant ecological niche, the species co-existence pattern and its influencing factors using Jaccard similarity coefficient, niche overlapping degree formula, null model analysis, and meta-analysis. Our results showed that: (1) with increased fragmentation, the plant diversity within the soil islands decreased, and the dominant plant species changed from Stipa breviflora to a combination of Artemisia scoparia and S. breviflora, and the plant communities within soil islands became more similar to communities outside; (2) most species showed relatively small ecological niche overlap between within and outside soil islands, with the overlap showing concentrated distribution within soil islands but scattered distribution outside the islands; (3) environmental filtering was the main driver of species co-existence patterns. As the soil islands became larger, the effect of environmental factors on species co-existence decreased, and the key environmental factor that explained species composition changed from clay and fine sand to coarse sand. Notably, competition was a key driver of co-existence patterns within small soil islands. In summary, soil islands provided important habitats for representative plant species in the desert steppe and environmental factors influenced species co-existence patterns. Both processes were disrupted by fragmentation. Maintaining soil islands larger than 200 m2 would be critical for restoring representative plant species and preserving plant diversity of the desert steppe ecosystems.

【Keywords】 habitat fragmentation; soil islands; niche overlap; species co-existence; desert steppe;

【DOI】

【Funds】 National Natural Science Foundation of China (41461046) Construction Project of Top Disciplines in Ningxia Hui Autonomous Region (NXYLXK2017B06)

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This Article

ISSN:1005-0094

CN:11-3247/Q

Vol 26, No. 07, Pages 667-677

July 2018

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Article Outline

Abstract

  • 1 Materials and methods
  • 2 Results
  • 3 Discussion
  • Supplementary material
  • References