Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Growth of invasive species Acacia decurrens Willd. and the effect of restoration on restoration plants.

Abstract

The eruption of Mount Merapi at the end of 2010 caused damage to the ecosystem, especially in the area of the Mount Merapi National Park (TNGM). TNGM conducted a post-eruption restoration by making a demonstration plot of the restoration using the species of puspa (Schima wallichii), salam (Syzygium polyanthum) and gayam (Inocarpus edulis) as core plants for restoration. At the same time, foreign species of Acacia deccurens that emerged since the 2006 eruption dominated and changed the structure and composition of species that existed in the post-eruption area in 2010. The presence A. decurrens of abundantin the demonstration plot was expected to disrupt the growth of restoration core plants, especially from canopy closure. This study aims to determine the growth characteristics of trees A. decurrens after eruption and the effect of the shade of canopy A. decurrens on the growth rate of restoration plants. The demonstration plot in this study used Incomplete Block Design with a total of nine blocks and each block consisted of three different plant plots, while planting spacing was made 4 m x 5 m. The data taken was the diameter of A. decurrens on various diameter criteria to obtain growth increment. Other data measured were height and diameter of restoration plants under conditions of >60% and not <60%. The data obtained were analyzed by R-statistics using Wilcoxon-paired test to determine the effect of shade A. decurrens on the growth of restoration plants. Measurement and analysis results showed that the average increment ofdiameter A. decurrens in the demonstration plot was 1.66 cm/year. In the class diameter of trees < 3.00 cm and> 10.00 cm experienced rapid changes compared to other diameter classes. The Wilcoxon-paired test analysis showed that the Gayam plant at height and diameter growth were affected by the shade conditions. The type of puspa with high accretion was not influenced by the shade conditions, whereas on the increase in diameter the shade condition has an influence. Salam in the shade condition >60% or <60% do not affect the height or diameter of the salam.