Ageratina riparia is an invasive alien species that get a particular attention in “Eka Karya” Bali Botanical Garden. This study aims to determine the abundance of invasive alien species A. riparia on forest floor vegetation in “Eka Karya” Bali Botanical Garden, and the factors that influence its abundance. Ageratina riparia is an invasive herb that can disrupt the balance of the ecosystem. The advantages of this plant in reproducing and adapting to the environment, make this plant very easy to grow and develop in a habitat. The purposive sampling method was used with the plot that placed systematically. The research area divided into five research stations with 10 plots (2 x 2 m) for each station. Vegetation data were analyzed to determine the density, relative density, frequency, relative frequency, and important value index (INP), then completed with Shannon-Weiner diversity index (H'), dominancy index (C), evenness index (E) and visualization abundance of species A. riparia of with Non-metric Multi Dimensional Scaling (NMDS). Environmental data is calculated analyses in Detrended Correspondence Analysis (DCA). The results showed that A. riparia at station 1 (Kawasan Kepala Burung) had an INP of 62.50%, station 2 (Taman Usada) with an INP of 52.40%, station 3 (Taman Cyathea) with an INP of 89.09%, station 4 (middle open area) with an INP of 110.25%, and the highest is at station 5 (Taman Upacara Panca Yadnya) with an INP value of 118.92%. The presence of A. riparia can be influenced by all environmental factors measured such as air humidity, soil moisture, soil pH, air temperature and soil temperature, altitude, land slope, and light intensity.

Kawasan hilir Daerah Aliran Sungai (DAS) Unda yang terletak di Kabupaten Klungkung telah mengalami suksesi akibat letusan Gunung Agung pada tahun 1963. Ekosistem di kawasan hilir Sungai Unda juga mengalami suksesi antropogenik akibat aktivitas manusia. Proses suksesi tersebut berdampak terhadap spesies tumbuhan penyusun vegetasi di kawasan tersebut. Penelitian ini bertujuan untuk mempelajari komposisi floristik vegetasi di kawasan hilir Sungai Unda. Penelitian dilakukan dengan metode jelajah pada tiga tipe ekosistem, yaitu ekosistem hutan dataran rendah, lahan tergenang, dan pantai. Hasil penelitian menunjukkan bahwa komposisi floristik di kawasan hilir Sungai Unda terdiri dari 163 jenis tumbuhan yang terbagi ke dalam 48 suku dan 128 marga. Bentuk hidup spesies tumbuhan didominasi oleh herba kecil (47 spesies), rumput (35 spesies), dan pohon (31 spesies). Fabaceae adalah suku dengan jumlah spesies terbanyak, diikuti oleh suku Poaceae dan Cyperaceae. Berdasarkan zona penelitian, hutan dataran rendah memiliki jumlah spesies terbanyak (120 spesies), sedangkan zona pantai paling sedikit (82 spesies). Stabilitas ekosistem di Kawasan Sungai Unda dapat terganggu oleh beberapa spesies tumbuhan invasif seperti eceng gondok (Eichhornia crassipes), kirinyuh (Chromolaena odorata), tembelekan (Lantana camara), kangkung pagar (Ipomoea carnea), akasia duri (Vachellia farnesiana), dan ekor kucing (Typha angustifolia).

The health of fallen tree collection especially which has not been assessed yet, has to be evaluated to understand its cause. This study aimed to see the health conditions of Cupressus guadalupensis and Pavetta sp. and the causes of fallen trees. The identification of tree health was done visually with a modified Tree Risk Assessment (TRA) form from the International Society of Arboriculture (ISA). Meanwhile, the internal examination used ArborSonic 3D Acoustic Tomograph. The tomogram results showed a hole in the tree trunk. The cause of the fallen trees was predicted due to structural damage with wind factors.