Keanekaragaman dan Pola Sebaran Spesies Tumbuhan Asing Invasif di Cagar Alam Pulau Sempu, Jawa Timur

Abstract

The presence of invasive alien plant species has been known to cause various negative impacts on ecosystems in the
invaded conservation area. This research aims to identify diversity and distribution pattern of invasive alien plants
species in Sempu Island Nature Reserve, and to determine the most influential environmental factors to their
dispersion. The methods used were the combination of quantitative vegetation analysis and rapid assessment
technique followed by the principal component analysis. As many as 10 invasive alien plants species (belonging to 7
families) have been identified within this conservation area, e.g., Pistia stratoites, Ageratum mexicanum, Vernonia
cinerea, Cyperus rotundus, Passiflora foetida, Centotheca lappacea, Eleusine indica, Imperata cylindrica, Hedyotis
corymbosa, and Lantana camara. All invasive alien plant species found in the sampling plots had a clumped
distribution pattern. The most influential environmental factors to the invasive alien plants dispersion were land
slope and distance from shoreline.
Keywords: distribution pattern, environmental factors, invasive alien plants, Sempu Island Nature Reserve