Land-use change is the main driver of biodiversity loss in the tropics worldwide. Lowland rainforest regions in
Southeast Asia are experiencing particularly high rates of large-scale conversion of forests and agroforests into
monocultural tree plantations including oil palm and rubber with devastating effects on forest-dependent
species. Canopy-dwelling organisms such as epiphytes are expected to be particularly susceptible to changes
in land use, vegetation structure, and microclimate but the consequences of these changes are only poorly
known for this plant group in Southeast Asia. We investigated the diversity of vascular epiphytes in four major
land-use systems in Jambi Province (Sumatra, Indonesia). Epiphyte communities were sampled in 120
20 × 20 m plots in Bukit Duabelas National Park (lowland rainforest) and in surrounding jungle rubber
agroforests as well as in rubber and oil palm plantations owned by smallholders. At plot level, lowland rainforest,
jungle rubber, and oil palm were statistically indistinguishable in terms of richness, diversity, and evenness but
had significantly higher values than rubber. Oil palm plantations had the highest epiphyte abundance, but lowest
total species number of all systems. Furthermore, oil palm had distinct, fern-dominated epiphyte communities
that differed significantly from the other systems. In conclusion, the value of monocultural tree plantations of
oil palms and rubber trees for epiphyte conservation is very low. Jungle rubber, an extensively managed yet
vanishing system, represents a refuge for epiphytes and could play a vital role in conserving epiphyte diversity,
especially of ferns and orchids. Non-orchid angiosperms, however, mainly occurred in forest and are thus most
threatened by forest conversion.