• 研究报告 •

### 五台山林线附近优势草本植物的分布格局、过程与尺度分析

1. (1生物多样性与生态工程教育部重点实验室， 北京师范大学生命科学学院， 北京 100875；2山东农业大学林学院， 山东泰安 271000)
• 出版日期:2019-02-10 发布日期:2019-02-10

### Distribution pattern and process of dominant herbaceous species on different scales near treeline of Wutai Mountain.

JIA Mei-yu1, ZHANG Jin-tun1*, LIANG Yu1, DING Mo-chong1, CAO Ge1, JIA Bing-yu2

1. (1 Key Laboratory of Biodiversity Sciences and Ecological Engineering, Ministry of Education; College of Life Sciences, Beijing Normal University, Beijing 100875, China; 2College of Forestry, Shandong Agricultural University, Taian 271000, Shandong, China).
• Online:2019-02-10 Published:2019-02-10

Abstract: Treeline is sensitive to climate change. Forest gap and edge are important windows for the invasion of herbaceous species. Research on distribution patterns of herbaceous species in forest gaps and forest edges of treeline ecotones could help explain important ecological processes. We selected a forest gap (elevation: 2350 m) and a forest edge (elevation: 2300 m) as plots(5 m×5 m) in a treeline ecotone of Wutai Natural Reserve. Twenty-five quadrats (1 m×1 m) were set up in each of both plots, within which the locations of six dominant species (Hierochloe glabra, Anemone rivularis, Plantago depressa, Polygonum viviparum, Potentilla freyniana, and Taraxacum mongolicum) were recorded. Complete spatial random process (CSR), heterogeneous Poisson process (HP), and Poisson cluster (PC) were used to simulate the spatial patterns of the six species at different scales. The results showed that: (1) Aggregated sizes of the six species in forest gaps were broader than those in the forest edge, with those of Polygonum viviparum and Anemone rivularis were broader than other species in both plots. The aggregated sizes of Taraxacum mongolicum and Plantago depressa were narrower than other species in both plots. The most common aggregation occurred on 0-40, 100-140 and 200-230 cm. (2) For both forest gap and edge, HP simulation and significance tests showed that micro-habitat differences between plots had no significant effect on species distribution with broad ecological amplitude. However, the distribution of Hierochloe glabra was significantly affected by micro-habitat differences in forest gap and edge due to ramet growth. (3) Results from PC simulations and significance tests showed that seed dispersal significantly affected species distribution in the forest edge. Seed dispersal around maternal individuals often occurred at 0-50 cm scales as affected by gravity. At the scale of >100 cm, species with special dispersal modes or structures affected their dispersal distance. Additionally, species with special structures could reach 250 cm with the help of strong winds.