Abstract
Epiphytic plant species are an important part of biological diversity. It is therefore essential to understand the distribution pattern and the factors influencing such patterns. The present study is aimed at observing the patterns of species richness, abundances and species composition of epiphytic orchids and ferns in two subtropical forests in Nepal. We also studied the relationship of host plants (Schima wallichii and Quercus lanata) and epiphyte species. Data were collected in Naudhara community forest (CF) and the national forest (NF) in Shivapuri Nagarjun National Park. The data were analyzed using univariate and multivariate tests. In total, we recorded 41 species of epiphytes (33 orchid and 8 fern species). Orchid species abundance is significantly higher in CF compared to NF. Orchid species richness and abundance increased with increasing southern aspect whereas it decreased with increasing canopy cover, and fern species richness increased with host bark roughness. Orchid abundance was positively correlated with increasing bark pH, stem size, tree age and tree height and negatively correlated with increasing steepness of the area. Likewise, fern abundances were high in places with high canopy cover, trees that were tall and big, but decreased with increasing altitude and southern aspect. The composition of the orchid and fern species was affected by altitude, aspect, canopy cover, DBH, number of forks and forest management types. We showed that the diversity of orchid and fern epiphytes is influenced by host characteristics as well as host types. The most important pre-requisite for a high epiphyte biodiversity is the presence of old respectively tall trees, independent of the recent protection status. This means: (i) for protection, e.g. in the frame of the national park declaration, such areas should be used which host such old tall trees; and (ii) also in managed forests and even in intensively used landscapes epiphytes can be protected by letting a certain number of trees be and by giving them space to grow old and tall.
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Acknowledgments
We are indebted to “Bauer-Stiftung und Glaser-Stiftung im Stifterverband für die Deutsche Wissenschaft” Project No. T237/24905/2013/Kg for the research grant. Maan B. Rokaya would like to acknowledge grant number 14-36098G of the Czech Science Foundation and the institutional support RVO 67985939. We are indebted to Zuzana Münzbergová for helping us with the data analysis and for providing useful comments. We thank the Shivapuri Nagarjun National Park authorities and the Naudhara Community Forest Committee, Phulchowki, Godavari, for the permission to carry out the research in this forest. We wish to express our thanks also to anonymous reviewers for their critical reading and valuable comments on previous versions of the manuscript. We would like to thank Bishnu P. Bhattarai for the map preparation.
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Adhikari, Y.P., Fischer, A., Fischer, H.S. et al. Diversity, composition and host-species relationships of epiphytic orchids and ferns in two forests in Nepal. J. Mt. Sci. 14, 1065–1075 (2017). https://doi.org/10.1007/s11629-016-4194-x
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DOI: https://doi.org/10.1007/s11629-016-4194-x