Tree competition, spatial pattern, and regeneration of a Mongolian pine natural forest in the southern geographical edge

Leilei, 潘磊磊 Pan; Semyung, Kwon Semyung Kwon; Yanshu, 刘艳书 Liu; Xiao, 张晓 Zhang; Yang, Xiaohui; Dan, 山丹 Shan; Yuanjun, 朱媛君 Zhu; Zhongjie, 时忠杰 Shi

doi:10.5846/stxb201804270955

Cited by 4 publications

(3 citation statements)

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“…Similar results were obtained by Jiang (2022) , who studied the effect of the CI on the density of young Pinus tabuliformis trees. A greater CI and a smaller DBH led to weaker individual competitive ability, greater competitive pressure from surrounding individuals, and less competitive pressure generated towards the surrounding seedlings; therefore, new seedlings tended to be distributed around individuals with high CIs ( Pan et al., 2019 ).…”

Section: Discussionmentioning

confidence: 99%

The spatial pattern of Populus euphratica competition based on competitive exclusion theory

Liu,

Zeng,

Wang

et al. 2024

Front. Plant Sci.

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IntroductionPopulation-level competition and spatial patterns may explain the role of competitive exclusion in communities, which is important for vegetation restoration and biodiversity conservation.MethodsWe analyzed the competitive intensity, spatial patterns, and renewal of Populus euphratica Oliv. forests in the Tarim River Basin using the Hegyi competition index and spatial point pattern analysis in a completely random model with different habitats and different forest ages. ResultsThe greatest competitive distance for P. euphratica was 10 m, and the intensity of competition steadily decreased as the diameter increased. The intensity of intraspecific and interspecific competition in young, mature, and old P. euphratica forests was as follows: riverside habitat > transitional habitat > desert margin habitat. The Simpson index values for the three habitats decreased as follows: transitional > riverside > desert margin, and the Shannon-Wiener index and Pielou index values decreased as follows: riverside > transitional > desert margin. In the riverside habitat, the young P. euphratica forest experienced the greatest competitive intensity, the mature forest in the transitional habitat was the largest, and the forest in the desert margin habitat was the oldest. Competitive intensity was greatest in the young riverside P. euphratica forest, mature P. euphratica forest in the transitional habitat, and old forest in the desert margin. Riverside P. euphratica experienced strong competition from Populus pruinosa. Competitive exclusion caused P. pruinosa to disappear from the transitional and desert margin habitats. Young, mature, and old P. euphratica forests were randomly distributed along the riverside and in the transitional habitat, while mature and old P. euphratica forests were randomly distributed in the desert margin. Populus pruinosa, Tamarix ramosissima, and Tamarix hispida were mainly randomly distributed, and T. ramosissima and T. hispida were clustered at small scales. In the riverside habitat, young, mature, and old P. euphratica had no spatial correlation, and there was a significant negative correlation at small scales in the transitional habitat. The density of P. euphratica seedlings in the riverside habitat was greater than that in the transitional habitat, and greater competitive pressures on P. euphratica tree seedlings caused a lower renewal density.ConclusionsWhen planting P. euphratica forests, spacing greater than 10 m can effectively reduce stand competition and thus promote seedling regeneration.

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Section: Discussionmentioning

confidence: 99%

The spatial pattern of Populus euphratica competition based on competitive exclusion theory

Liu,

Zeng,

Wang

et al. 2024

Front. Plant Sci.

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“…This is consistent with the results of the competition intensities of H. ammodendron and H. persicum. With the increase in the competition index, the density of the regenerated saplings in the range of different circle radii also increased, indicating that the higher the competition index, the smaller the basal diameter, the weaker the individual's competitiveness, the lower the competition pressure of the surrounding individuals, the stronger their competitive pressure from surrounding individuals, and the less competitive pressure they can generate on surrounding regenerated seedlings and saplings, so regenerated young trees tend to be distributed around individuals with a high competition index (Pan et al, 2019). In addition, the mother trees of H. ammodendron and H. persicum have more individuals in the community and produce more seeds so that there are enough provenances around the mother tree (Li et al, 2009), and their seeds have a strong germination ability , which results in increased regeneration density of seedlings and saplings at a smaller scale.…”

Section: Natural Regeneration Of H Ammodendron and H Persicum Communi...mentioning

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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“…where CI is the competition index of target tree i, D i is the DBH of the target tree i, D j is the DBH of the competing tree j, L ij is the distance between target tree i and competing tree j, and N is the number of competing trees. According to previous research [49], trees with DBH ≥ 5 cm within a radius of 8 m are used as competing trees in this study. Since trees will grow with time, their competitive indexes will change, but for the target tree, the relative competitive pressure is constant.…”

Section: Competition Index (Ci)mentioning

confidence: 99%

Effect of Climate and Competition on Radial Growth of Pinus sylvestris var. mongolica Forest in Hulunbuir Sandy Land of Inner Mongolia, China

Wen

Shi

Zhang

et al. 2023

Plants

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(1) Background: The forest of Pinus sylvestris var. mongolica is an important semi-arid ecosystem in Hulunbuir sandy land that plays a key role in the carbon cycle and wind erosion control. It is crucial to explore the main factors affecting the radial growth of trees of P. sylvestris var. mongolica. (2) Methods: The study established the tree-ring chronology of P. sylvestris var. mongolica and analyzed the relationships among the radial growth, competition index, and climate variables using correlation analysis and a linear mixed effect model to explore the influence of competition and climate on radial growth of P. sylvestris var. mongolica. (3) Results: The results indicated that tree growth is mainly affected by the maximum average temperature (Tmax) and precipitation in June and July of the current year and that tree growth significantly decreased with increasing competition pressure. Analysis of the linear mixed effect model showed that tree age, competition intensity, self-calibrating Palmer drought severity index (scPDSI) from May to July, and vapor pressure deficit (VPD) have a significant impact on radial growth. (4) Conclusions: The competition plays a dominant role in radial growth of P. sylvestris var. mongolica compared to climate factors. This study helps to understand the growth mechanism of P. sylvestris var. mongolica forests under climate change and provides a scientific basis for effective management of semi-arid forests.

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Tree competition, spatial pattern, and regeneration of a Mongolian pine natural forest in the southern geographical edge

Cited by 4 publications

References 0 publications

The spatial pattern of Populus euphratica competition based on competitive exclusion theory

The spatial pattern of Populus euphratica competition based on competitive exclusion theory

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

Effect of Climate and Competition on Radial Growth of Pinus sylvestris var. mongolica Forest in Hulunbuir Sandy Land of Inner Mongolia, China

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