A study of the point occurrence pattern of Artemisia ordosica populations and their spatial correlation with Caragana microphylla occurrence in the Mu Us sandy land

doi:10.11686/cyxb2025422

Abstract

Abstract:

Artemisia ordosica， is a valuable sand-fixing plant in China and is also important as a dominant species in the sand plant community. This research investigated the population distribution pattern of A. ordosica during the process of sand fixation and the dynamics of population change， as well as the relationship with the sand-fixing plant Caragana microphylla， in order to understand the mechanisms of population dynamics and the factors influencing the distribution pattern. In this study， A. ordosica communities coexisting with C. microphylla were selected from semi-fixed and fixed sandy land in within the Mu Us sandy land. Based on the complete spatial randomness model （CSR）， heterogeneous poisson model （HP）， antecedent condition model （AC） and toroidal shift model （TS） of point pattern， the spatial distribution pattern of A. ordosica populations， the spatial correlation of three size classes （Ⅰ， d≤25 cm；Ⅱ， 25 cm<d≤75 cm；Ⅲ， d>75 cm） and the interaction with C. microphylla were studied at a scale of 20 m. It was found that the age structure of A. ordosica populations was a ‘growth’ type in semi-fixed sandy land while the population exhibited a transition stage from stability to decline in fixed sandy land. According to the CSR model， both the A. ordosica populations （including all three size classes） and the C. microphylla populations exhibited an aggregated distribution at small scales or small to medium scales， and the degree of aggregation increased with the degree of sand fixation. The results of the HP model after eliminating habitat heterogeneity showed that the aggregation decreased to varying degrees， and the semi-fixed sand population was more obvious. According to the AC model， there were different degrees of positive correlations between class I and Ⅱ， and class Ⅱ and Ⅲ individuals of A. ordosica， and the positive correlation was stronger in fixed sandy land， while class Ⅰ and class Ⅲ plants showed no correlation in both types of sandy land. With increasing scale， especially at scales greater than 16 m， A. ordosica and C. microphylla mostly showed random distribution and uniform distribution （HP model）， and A. ordosica mostly showed no correlation between different size classes， reflecting a decrease in interaction between individuals. With the fixation of sandy land， the number of individuals and density of the two plant species increased significantly. The results of the TS model showed that the interspecific association showed a negative correlation from the small scale （0-1.0 m） of the semi-fixed sandy land to the small and medium scale （0-7.8 m） of the fixed sandy land， indicating that the competition between A. ordosica and C. microphylla was significantly enhanced. The research results provide reference data for the selection of species and the combination of planting methods in sandy land management.

Key words: Artemisia ordosica, Caragana microphylla, spatial distribution pattern, spatial association, null model

Rui ZHANG, Tie-juan WANG, Bing-bing ZHANG, Jing FENG, Jin-ling SHAO. A study of the point occurrence pattern of Artemisia ordosica populations and their spatial correlation with Caragana microphylla occurrence in the Mu Us sandy land[J]. Acta Prataculturae Sinica, 2026, 35(10): 79-90.

Figures/Tables 7

Table 1 Individual size characteristics of A. ordosica population plant

样地

Plot

株数

Plant number

密度

Density

（plant·m^-2）

最小值

Minimum

value （cm）

最大值

Maximum

value （cm）

均值

Mean

value （cm）

标准差

Standard

deviation

变异系数

Coefficient of variation （%）

各级株数比例

All classes of the plant number proportion

Fig.1 Spatial distribution of individuals of A. ordosica and C. microphylla

Fig.2 Spatial distribution pattern of A. ordosica and C. microphylla populations

Fig.3 Spatial distribution patterns of three size classes of A. ordosica population in semi-fixed sandy land

Fig.4 Spatial distribution patterns of three size classes of A. ordosica population in fixed sandy land

Fig.5 Spatial correlation between different size classes of A. ordosica populations

Fig.6 Interspecific association between different sizes of A. ordosica and C. microphylla

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