Spatial Point Patterns of Artemisia ordosica on Three Dune Types in the Mu Us Sandy Land, China

doi:10.7525/j.issn.1673-5102.2026.02.011

Abstract

Abstract:

This study investigated the spatial patterns and growth-stage differences of sand-fixing shrubs across three dune geomorphological types： fixed dunes， semi-fixed dunes， and mobile dunes. Artemisia ordosica plants from the Mu Us Sandy Land were selected as the study material. Spatial point pattern analysis， incorporating the g（r） function and several null models， was applied to examine the spatial distribution， intraspecific associations， and the influence of individual relative elevation on A. ordosica populations at two growth stages（adult and juvenile plants） across the three dune types. The findings revealed that， after accounting for habitat heterogeneity， A. ordosica populations consistently exhibited clustered distributions at small scales（0-5 m）， transitioning to random or uniform distributions at larger scales. Additionally， the aggregation intensity（κ） and standard deviation of aggregation distribution（σ） increased with the degree of dune fixation. For different growth stages， the σ was significantly greater for adult plants than for juvenile plants. Regarding intraspecific associations， the relationship between adult and juvenile plants generally exhibited a non-associative（or independent） state， with significant positive associations observed only at the 3-10 m scale on semi-fixed dunes. Furthermore， the influence of individual relative elevation on population spatial distribution demonstrated strong dune-type dependency. Its effect was negligible on highly stable fixed dunes， strongly constrained the distribution of both adult and juvenile plants on semi-fixed dunes， and primarily affected juvenile plants on mobile dunes， which exhibited a significant preference for areas with lower individual relative elevation differences， such as dune bottoms. This study provides theoretical support for the development of sustainable windbreak and sand-fixation strategies in this region.

Key words: Mu Us Sandy Land, three dune types, Artemisia ordosica, spatial point pattern, intraspecific association, individual relative elevation

CLC Number:

Q948.1

Wenqi HUANG, Dinghai ZHANG, Lan YI. Spatial Point Patterns of Artemisia ordosica on Three Dune Types in the Mu Us Sandy Land, China[J]. Bulletin of Botanical Research, 2026, 46(2): 324-335.

Figures/Tables 8

Fig.1

Fig.2

Fig.3

Table 1

PCP model parameters of Artemisia ordosica under different types of sand dunes and growth stages

沙丘类型

Dune type

生长阶段

Growth stage

聚集强度 $κ$

Aggregation intensity $κ$ /（cluster centers∙m^-2）

聚集分布标准差 $σ$

Standard deviation of aggregation distribution $σ$

固定沙丘

Fixed dune

成株

Adult plant

0.007 5

3.865 0

固定沙丘

Fixed dune

幼株

Juvenile plant

0.001 9

2.584 5

半固定沙丘

Semi-fixed dune

成株

Adult plant

0.003 9

3.290 9

半固定沙丘

Semi-fixed dune

幼株

Juvenile plant

0.003 4

2.069 4

流动沙丘

Mobile dune

成株

Adult plant

0.000 8

2.759 4

流动沙丘

Mobile dune

幼株

Juvenile plant

0.002 5

1.460 6

Table 1

Fig.4

Fig.5

Fig.6

Table 2

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沙丘类型 Dune type	生长阶段 Growth stage	观测均值 Observed mean	模拟均值［95% CI］ Simulated mean ［95% CI］	观测均值P值 Observed mean P-value	观测标准差 Observed standard deviation	模拟标准差均值 Simulated standard deviation mean	观测标准差P值 Observed standard deviation P-value
固定沙丘 Fixed dune	成株 Adult plant	6.324	5.825［5.057~6.566］	0.216	4.414	4.353	0.389
固定沙丘 Fixed dune	幼株 Juvenile plant	7.377	7.017［4.135~9.706］	0.778	4.477	4.868	0.191
半固定沙丘 Semi-fixed dune	成株 Adult plant	3.794	4.795［3.713~5.904］	0.072^†D	2.229	2.873	0.013^*L
半固定沙丘 Semi-fixed dune	幼株 Juvenile plant	3.892	4.603［3.338~5.887］	0.274	2.188	2.915	0.034^*L
流动沙丘 Mobile dune	成株 Adult plant	3.112	3.299［2.570~3.737］	0.443	1.029	0.578	0.186
流动沙丘 Mobile dune	幼株 Juvenile plant	4.821	6.285［4.948~7.909］	0.036^*D	2.587	2.818	0.297