Abstract
Most studies mentioned that Acacia crassicarpa belongs to invasive species that could threat the native biodiversity. To respond that issue, we conducted a study that covers the understory and soil macrofauna diversity of three native tree species, namely mahang (Macaranga pruinosa), skubung (Macaranga gigantea) and geronggang (Cratoxylum arborescens) and an exotic species namely krassikarpa in a drained peatland in Pelalawan, Riau. The observation of understory vegetation under each studied species was undertaken by using 2 x 1 m plots. Furthermore, the structure of macrofauna was observed by pitfall trap methods. Results revealed that there were two fern species namely Neprolephis biserrata and Stenochlaena palustris that dominated the understory vegetation in namely mahang (Macaranga pruinosa), skubung (Macaranga gigantea) and geronggang (Cratoxylum arborescens). The diversity index in vegetation structure among those four tree species was insignificantly varied. Moreover, the percentage of understory coverage under A. crassicarpa was significantly higher than that under all native tree species. On the other hand, Formicidae and Rhinotermitidae were dominant in skubung and krassikarpa. Meanwhile, Formicidae and Blattidae were high in mahang and geronggang. Furthermore, diversity index of macrofauna were significantly low at krassikarpas`s understory compare to other three native species. This study suggested that the introduction of krassikarpa affect the biodiversity.
Highlights
Indonesia is the second largest biodiversity country in the world after Brazil [1,2]
The peat type at location based on its maturity is dominated by fibric-hemic and drained with the annual variation of water table depth was 20 – 140 cm below soil surface [20,21] .The plots were consisted of four years old of A. crassicarpa, M. gigantea, M. pruinosa, and C. arborescens
The results revealed that ferns species, namely Neprolephis biserrata and Stenochlaena palustris dominated the understory vegetation understands of M. gigantea, M. pruinosa, and C. arborescens
Summary
Indonesia is the second largest biodiversity country in the world after Brazil [1,2]. In order to maintain its biodiversity richness, Indonesia esta blished 566 na tiona l pa rks tha t a lmost protecting 36 million ha [3]. Peat is one of soil type which has more than 18% of C-content and commonly found in one ecosystem located behind the riverbank [5,6]. One characteristic of peatland is that the land is and rapidly loss their water content and it leads to desiccat ion [7]. When the desiccation is widely and heavily spreading, it is being burned and would lead to more disastrous situation
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