文献类型：期刊文献

英文题名：Effects of biotic/abiotic factors on the seedling regeneration of Dacrydium pectinatum formations in tropical montane forests on Hainan Island, China

作者：Liu, Haodong[1,2] Chen, Qiao[1] Chen, Yongfu[1] Xu, Zhiyang[3] Dai, Yunchuan[4] Liu, Yang[1] Jiang, Yi[1] Peng, Xi[5] Li, Huayu[6] Wang, Juan[6] Liu, Hua[1]

第一作者：Liu, Haodong

通信作者：Chen, Q[1];Liu, H[1]|[a0005e604c56678d970cd]陈巧;

机构：[1]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China;[2]NFGA, Key Lab Forest Management & Growth Modelling, Beijing, Peoples R China;[3]East China Inventory & Planning Inst Natl Forestr, Hangzhou 321000, Zhejiang, Peoples R China;[4]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China;[5]Sichuan Agr Univ, Coll Forestry, Chengdu 611130, Sichuan, Peoples R China;[6]Southwest Forestry Univ, Coll Forestry, Kunming 650233, Yunnan, Peoples R China

年份：2020

卷号：24

外文期刊名：GLOBAL ECOLOGY AND CONSERVATION

收录：;Scopus(收录号：2-s2.0-85096834252);WOS:【SCI-EXPANDED(收录号:WOS:000608482400004)】；

基金：This work was supported by the Fundamental Research Funds for the Central Nonprofit Research Institution of CAF (CAFBB2017ZB004) and Research on the Mechanism of Natural Regeneration barriers of Dacrydium pierrei in Hainan Island (2019JYZJ01).

语种：英文

外文关键词：Dacrydium pectinatum; Natural regeneration; Niche partitioning; Negative density dependence; Hainan island

摘要：Exploring natural regeneration facilitates a better understanding of the mechanisms of community assembly and biodiversity formation. However, convincing data on tree regeneration in threatened tropical plant communities are lacking. Dacrydium pectinatum is a constructive and endangered species in tropical montane forests of Hainan Island. This study aims to identify the seedling regeneration patterns of D. pectinatum formation and their key drivers. A total of 204 seedling plots were investigated in the northwest (Bawangling, 90 plots), southwest (Jianfengling, 90 plots) and southeast (Diaoluoshan, 24 plots) of Hainan Island. We examined the variations in the seedling/adult composition, density and richness along local scales and elevation gradients and analyzed the relationships between biotic/abiotic variables and seedling regeneration. The seedling distribution pattern changed with environmental gradients, and the seedling density and richness decreased from low to high latitudes and from low to high elevations. Additionally, the adult density and total base area also showed consistent trends. At the community and species levels, the biotic neighborhood variables had a primary impact on the seedling density and richness. Multiple environmental factors (such as the canopy density, elevation, slope, soil organic matter, and soil total nitrogen) also showed significant correlations with the seedling density and richness. Our study supports conspecific negative density dependence and niche filtering as the general mechanisms of natural regeneration of D. pectinatum formations. Both biotic and abiotic factors might affect the survival and growth of seedlings, and their relative importance varies with environmental gradients and species. We conclude that enclosing forests with moderate stand densities in low-elevation areas to reduce human interference will help optimize the community structure. However, for high-elevation areas and high-density forests, appropriate thinning, manual regeneration and open gaps are needed to improve the light environment and soil nutrients, thereby promoting the natural regeneration of D. pectinatum formations. (C) 2020 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.