Similarity Analysis of Understorey Plant Species in Forest Areas

Abstract

Many forests have substantial understorey plants. These plants have an important contribution to soil and water conservation. The similarity index determines the resemblance of species structure and composition in a community. This research is aimed to see the impact and relationship of changes in the allocation of forest areas to the similarity of understorey species. The research was conducted using the line plot sampling method, sized 2 m x 2 m, with the understorey plants observed have been measured from germination to young plant (height 1.5 m). The number of plots in the plantation forest is 480 plots, protected areas 224 plots, and natural forest 96 plots. Determination of the number of understorey plots based on the minimum representative area curve. A Similarity Index was performed to analyze the data. The results indicated that there is an impact of changes in the forest area on the similarity of understorey species. It is known from the low similarity index value at the research location. It is due to the differences in environmental factors at the two locations such as air humidity, air temperature, the intensity of sunlight, and different patterns of forest area management.

Dynamics of Species Richness in Understory Deciduous Teak Forest (Tectona grandis)

“…We placed three transects around the forest edge, each (9 transects), and plotted 1 m × 1 m plots. Data was collected at distances of 5,10,15,20,25,30,35,40,45 and 50 m on each transect. On each transect (line) 3 repetitions were carried out so that there were 90 quadrats.…”

“…The management of industrial plantation forests, which are secondary forests tends to be monoculture and has homogeneous stands [29,11]. Homogeneous stands from year to year impact the understory composition of species that will remain unchanged [18,20]. This is certainly different from teak plants which have the characteristics of dropping leaves in the dry season (deciduous plant) and turning green during the wet season [5].…”

“…We placed three transects around the forest edge, each (9 transects), and plotted 1 m × 1 m plots. Data collection was carried out at distances of 5,10,15,20,25,30, 35, 40, 45 and 50 m on each transect. In each plot, the composition of the understory vegetation cover, litter cover and soil bare was observed.…”

Analisis Dinamika Vegetasi Tumbuhan Bawah (Understorey) di Tegakan Agroforestri dan Monokultur Jati (Tectona grandis) Akibat Perubahan Musim

“…Hal ini karena tegakan pada AF, yaitu tebu dan singkong merupakan tanaman dengan siklus semusim dan tidak mengalami pengguguran daun sebagaimana yang terjadi pada MN sehingga tidak terjadi akumulasi serasah di lantai ekosistem. Keterbukaan kanopi memberikan peluang sinar matahari mencapai lantai hutan lebih banyak yang menyebabkan tingginya rangsangan pada tumbuhan bawah, biji, rimpang, dan biji lebih cepat berkecambah dan bertumbuh (Sidabukke et al, 2022). Namun, pada penelitian ini, keterbukaan kanopi memiliki korelasi negatif terhadap tutupan vegetasi tumbuhan bawah, dimana tutupan vegetasi tumbuhan bawah lebih banyak saat musim hujan ketika keterbukaan kanopi jati lebih rapat.…”