The influence of large trees on distribution of same species adjacent trees in broadleaved Korean pine forests in Xiaoxing'an Mountains

Dawei, 王大伟 Wang; Qingxi, 国庆喜 Guo

doi:10.5846/stxb201809182033

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“…discovered that two desert shrubs showed positive interspecific relationships on a small scale and negative relationships as interspecific competition intensified in the presence of grazing disturbance by studying the spatial distribution pattern and interspecific relationship of the two desert shrubs. The spatial pattern of plants depends on factors such as internal plant characteristics, interspecific relationships, and the interaction between different individuals of the same species, as well as the habitat conditions of the species and the spatial dynamics of growing competition between plants (Wang, 2019). Therefore, analyzing the competition index and spatial distribution pattern of the main desert tree species to understand the species population in the current environment, the living status of the community, and the future development trend is more helpful to protect the desert community.…”

Section: Introductionmentioning

confidence: 99%

Competition, spatial pattern, and regeneration of Haloxylon ammodendron and Haloxylon persicum communities in the Gurbantunggut Desert, Northwest China

et al. 2022

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Competition, spatial pattern, and regeneration are important factors affecting community composition, structure, and dynamics. In this study, we surveyed 300 quadrats from three dunes (i.e., fixed dunes, semifixed dunes, and mobile dunes) in the Gurbantunggut Desert, Northwest China, from late May to early June in 2021. The intraspecific and interspecific competition, spatial pattern, and regeneration of Haloxylon ammodendron and Haloxylon persicum were studied using the Hegyi competition index and point pattern analysis methods. The results showed that the optimal competition distance of the objective tree in the H. ammodendron and H. persicum communities was 6 m. The intraspecific and interspecific competition of H. ammodendron was the greatest in fixed dunes, while the competition intensity of H. persicum in semifixed dunes and mobile dunes was greater than that in fixed dunes. The order of competition intensity of the two populations was seedlings>saplings>adults, and the competition intensity gradually decreased with the increase in plant diameter. The spatial distribution pattern of the three life stages of H. ammodendron and H. persicum was random, and there were no correlations between seedlings and saplings, adults and saplings, and seedlings and adults. The density of regenerated seedlings and saplings of H. ammodendron in the three dunes followed the order of fixed dunes>semifixed dunes>mobile dunes, and that of H. persicum in the three dunes followed the order of mobile dunes>semifixed dunes>fixed dunes. Therefore, when artificially planting H. ammodendron and H. persicum for sand control, the planting interval should be 6 m, and seedlings should be planted next to adults to minimize the competition between plants, which can promote the renewal of H. ammodendron and H. persicum and the stabilization of the ecosystem.

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Section: Introductionmentioning

confidence: 99%