Spatial distribution and interspecific correlation of Haloxylon persicum and H. ammodendron on fixed dunes of the Gurbantunggut Desert, China

doi:10.17520/biods.2021280

Abstract

Abstract:

Aims The aim of this study is to explore the coexistence and succession mechanism of sand-fixing shrubs population in the desert.

Methods Based on the current literature on the geographical location and developmental stages (young, nutrition, reproductive and dead plant) of Haloxylon persicum and H. ammodendron populations on fixed dunes in the southeastern edge of the Gurbantunggut Desert, this paper adopted the methods of point pattern analysis g(r) function, Monte-Carlo random simulation test, and zero model selection. The spatial distribution pattern and interspecific correlation of H. persicum and H. ammodendron populations at different developmental stages in the scale of 0-20 m were analyzed.

Results (1) The two populations demonstrated aggregated distribution in the range of the study scale, and the aggregation intensity decreased as the scale increased. (2) There is a negative correlation between the two populations, and the larger the scale, the more significant the negative correlation. (3) The greater the difference between developmental stages of H. persicum population, the more significant the positive correlation amongst individuals, and the closer the developmental stages of H. ammodendron population, the more significant the positive correlation amongst individuals. (4) The older individuals in the two populations (e.g., the stages of nutrition, reproductive and dead plant) could inhibit growth of the smaller young plants in the other populations. At the same time, with the development of individuals in both populations, the inhibition in both species gradually weakened, exhibiting both positive correlation and non-correlation.

Conclusion The distribution pattern of H. persicumand H. ammodendron population in fixed dunes of the Gurbantunggut Desert has an aggregated distribution. As the age class of each population increases, the aggregate distribution weakens. Habitat heterogeneity and diffusion are the two main factors. There is a negatively correlated interspecific relationship between both species, and the intraspecific developmental stages are positively correlated.

Key words: the Gurbantunggut Desert, sand-fixing shrubs, g(r) function, spatial distribution pattern, intraspecific and interspecific spatial association

Yating Wang, Dinghai Zhang, Zhishan Zhang. Spatial distribution and interspecific correlation of Haloxylon persicum and H. ammodendron on fixed dunes of the Gurbantunggut Desert, China[J]. Biodiv Sci, 2022, 30(3): 21280.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2021280

https://www.biodiversity-science.net/EN/Y2022/V30/I3/21280

Figures/Tables 6

Fig. 1 Quantitative structure of Haloxylon persicum and H. ammodendron

Fig. 2 Spatial distribution pattern of Haloxylon persicum and H. ammodendron populations and individuals at different developmental stages based on complete spatial randomness (CSR) models. Dot lines were confidence interval of 99%.

Fig. 3 Spatial distribution pattern of Haloxylon persicum and H. ammodendron populations and individuals at different developmental stages based on heterogeneous Poisson (HP) models. Dot lines were confidence interval of 99%.

Fig. 4 Interspecific relationship between Haloxylon persicum and H. ammodendron. Dot lines were confidence interval of 99%.

Table 1 Spatial correlation between different developmental stages of Haloxylon persicum and H. ammodendron populations

	白梭梭幼株 H. persicum young plant	白梭梭营养株 H. persicum nutrition plant	白梭梭生殖株 H. persicum reproductive plant	白梭梭死株 H. persicum dead plant
梭梭幼株 H. ammodendron young plant	1 m: / > 1 m: -	> 0 m: -	> 0 m: -	> 0 m: -
梭梭营养株 H. ammodendron nutrition plant	1-5 m: - 6-7 m: / 8-9 m: + 10-11 m: / > 11 m: +	1 m: / 2 m: + 3-4 m: / > 4 m: +	1-2 m: / > 2 m: +	1 m: - 2-4 m: / 5-6 m: - 7-9 m: / 10-11m: + 12-19 m: / > 19 m: +
梭梭生殖株 H. ammodendron reproductive plant	> 0 m: -	1 m: / > 1 m: +	1-4 m: / > 4 m: +	1-7 m: / 8-9 m: + 10-12 m: / 13-14 m: + 15-16 m: / > 16 m: +
梭梭死株 H. ammodendron dead plant	> 0 m: -	> 0 m: -	> 0 m: -	1-16 m: - 17-19 m: / > 19 m: -

Fig. 5 Intraspecific spatial correlation at different developmental stages of Haloxylon persicum and H. ammodendron. Dot lines were confidence interval of 99%.

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