Spatial Pattern and Ecological Process Difference Analyses of the Boundary Habitats of a Treeline Patch: A Case Study from the Li Mountain, North China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area and Field Sampling
2.2. Data Analysis
2.2.1. Environmental Factors Analysis
2.2.2. Importance Value Calculation
2.2.3. Community Similarity Analysis
2.2.4. DBH Distribution Analysis
2.2.5. Point Pattern Analysis
2.2.6. Model Test
2.3. Software Analysis and Figure Processing
3. Results
3.1. Environmental Conditions within Sampling Plots
3.2. Community Structure and Dynamic
3.2.1. Composition and Similarity Differences in Tree Layer and Shrub Layer
3.2.2. DBH Numerical Distribution
3.3. Null Model Analysis on Patterns, Processes of the Three Species
3.3.1. Completely Spatially Random Null Model Analysis
3.3.2. Heterogeneous Poisson (HP) Null Model Analysis
3.3.3. Homogeneous Thomas (HT) Null Model Analysis
3.3.4. Inhomogeneous Thomas (IT) Null Model Analysis
3.4. Homogeneous Poisson Null Model Analysis Inter-Specific Correlation
4. Discussion
4.1. The Differences of Community Structure and Species Spatial Pattern at the Upper and Lower Limits of Treeline Patch
4.2. Effect of Community Density Heterogeneity on Seedling Pattern
4.3. Seed Dispersal Effect and Size Effect on Species Patterns
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Environmental Factors | Upper Limit | Lower Limit | Significance |
---|---|---|---|
Altitude (m) | 2300 | 2250 | None |
Slope aspect | North by east 45° | True north | None |
Number of dead trees Slope * (°) | 14 28.6 A ± 2.27 | 7 6.6 B ± 1.03 | None p < 0.05 |
Soil layer thickness (cm) | 27.8 ± 9.09 | 19.0 ± 4.54 | p > 0.05 |
Litter layer thickness (cm) | 4.0 ± 3.39 | 1.4 ± 0.77 | p > 0.05 |
pH of surface soil layer | 5.9 ± 0.10 | 5.9 ± 0.15 | p > 0.05 |
Temperature of surface soil layer (°C) | 12.3 ± 0.97 | 13.6 ± 0.89 | p > 0.05 |
Tree coverage (%) | 51.0 ± 11.40 | 43.8.0 ± 10.50 | p > 0.05 |
Life Form | Species | Upper Limit | Lower Limit |
---|---|---|---|
Tree layer | Pinus armandii | 0.361 | 0.012 |
p = 0.049 * | Betula albo-sinensis | 0.331 | 0.095 |
Betula utilis | 0.237 | 0.804 | |
Padus racemosa | 0.034 | 0.034 | |
Cerasus clarofolia | 0.017 | 0.056 | |
Salix wallichiana | 0.020 | 0.000 | |
Shrub layer | Betula albo-sinensis | 0.477 | 0.137 |
p = 0.31 | Cotoneaster acutifolius | 0.073 | 0.038 |
Lonicera szechuanica | 0.043 | 0.064 | |
Lonicera chrysantha | 0.037 | 0.079 | |
Pertya sinensis | 0.036 | 0.148 | |
Salix wallichiana | 0.032 | 0.050 | |
Spiraea trilobata | 0.100 | 0.000 | |
Rubus flosculosus | 0.063 | 0.000 | |
Ribes vilmorinii | 0.051 | 0.000 | |
Sorbus koehneana | 0.000 | 0.077 | |
Viburnum mongolicum | 0.000 | 0.062 | |
Eleutherococcus henryi | 0.000 | 0.048 | |
Abelia biflora | 0.000 | 0.032 | |
Cerasus clarofolia | 0.000 | 0.200 |
Test Item | CSR Null Model | IP Null Model | HT Null Model | IT Null Model |
---|---|---|---|---|
Upper Limit—Pinus armandii | 0.005 | 0.115 | 0.005 ** | 0.875 |
Upper Limit—Betula albo-sinensis | 0.005 | 0.005 ** | 0.400 | 0.435 |
Upper Limit—Betula utilis | 0.005 | 0.015 * | 0.350 | 0.090 |
Lower Limit—Pinus armandii | 0.005 | 0.005 * | 0.675 | 0.510 |
Lower Limit—Betula albo-sinensis | 0.005 | 0.010 * | 0.920 | 0.805 |
Lower Limit—Betula utilis | 0.005 | 0.020 * | 0.335 | 0.710 |
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Jia, M.; Zhang, J.; Song, Z.; Sadia, S. Spatial Pattern and Ecological Process Difference Analyses of the Boundary Habitats of a Treeline Patch: A Case Study from the Li Mountain, North China. Land 2022, 11, 2064. https://doi.org/10.3390/land11112064
Jia M, Zhang J, Song Z, Sadia S. Spatial Pattern and Ecological Process Difference Analyses of the Boundary Habitats of a Treeline Patch: A Case Study from the Li Mountain, North China. Land. 2022; 11(11):2064. https://doi.org/10.3390/land11112064
Chicago/Turabian StyleJia, Meiyu, Jintun Zhang, Zhenhui Song, and Sehrish Sadia. 2022. "Spatial Pattern and Ecological Process Difference Analyses of the Boundary Habitats of a Treeline Patch: A Case Study from the Li Mountain, North China" Land 11, no. 11: 2064. https://doi.org/10.3390/land11112064