Diversity of Undergrowth Invasive Plant Species in the Sultan Syarif Hasim Great Forest Park Area, Riau Province

Fadhilah, Dyan Nur (2024) Diversity of Undergrowth Invasive Plant Species in the Sultan Syarif Hasim Great Forest Park Area, Riau Province. S1 thesis, Universitas Andalas.

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Abstract

The Sultan Syarif Hasyim Grand Forest Park is a conservation area in Riau Province with most of the area has been degraded due to land-function. The presence of invasive plants that grow around this area also threaten the remaining area. Invasive species can suppress the growth of other species growing which can cause biodiversity loss. Research on the diversity of invasive plants in the Sultan Syarif Hasim Grand Forest Park area was carried out in June-November 2023 with the aim of determining the composition and structure of invasive plants found in this area. The method used is a survey method with purposive sampling placement by creating 10 plots with the measurement of 2 x 2 m per plot. The research results showed that the plant composition consisted of 13 families, 25 genera, 28 species with 411 individuals. Among them, the composition of invasive plants consists of 8 families, 18 genera, and 20 species with 302 individuals with the dominant family being Cyperaceae (20.19%), and the co-dominant families being Poaceae, Melastomataceae, and Fabaceae with respective percentages of 16.30%, 13.38%, 11.44%. The plant structure with the highest IVI was found in the Melastoma malabatricum with a value of 28.14% and the lowest was in Acacia mangium with a value of 2.18% in form of seedling. The diversity index for all species is classified as high with a value of 3.04, with the diversity index for non-invasive and invasive plants is classified as moderate with a value of 1.78 and 2.71. Invasive plant species are more successful in dominating the area due to disturbances that cause gaps in the forest that result in high light intensity and temperature that support optimal growth of invasive plants.

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