DISTRIBUTION PATTERN OF THE EXOTIC PLANT (SYNEDRELLA NODIFLORA (L) GAERTN) IN THE REHABILITATION ZONE, RESORT OF WONOASRI, MERU BETIRI NATIONAL PARK

Exotic plants are plants that are intentionally or unintentionally included in an area. Based on the results of the 2020 survey, one of the exotic plants found in the Donglo Block Rehabilitation Zone area of Meru Betiri National Park (MBNP) is cinderella weed (Synedrella nodiflora). The objective of this study is to determine the distribution pattern and area of cover of exotic S. nodiflora plants in the research location. Data were collected using a combination method of systematic plot transects measuring 2 x 2 meters which were placed along the transect with a total of 415 plots. The data recorded were the coordinate position of each individual S. nodiflora and the area of the cover. Analysis of distribution pattern data using the Morisita index and visualized with a spatial distribution map using Geographic Information System (GIS). Coverage area analysis was carried out by calculating the percent cover of S. nodiflora. The results of the analysis of the Morisita index showed the value of Iδ = 7.13, which indicates that the distribution pattern of the plants is clustered. In addition, the presence of this species in the study area was occupied 41.7% or 0.85 ha of the total area of 2.04 ha. It shows that this species still did not dominate the area, so it can be said that this species has not yet become an invasive species category in the research location.


INTRODUCTION
Meru Betiri National Park (MBNP) is a nature conservation area that It is divided into several zoning, one of which is the rehabilitation zone (Guntoro, 2017;Meru Betiri National Park, 2020).The Rehabilitation Zone is an area that has been damaged or degraded, so that the vegetation that grows in it is not only native vegetation (Alvinda et al., 2017).The zone is managed by an intercropping system by the community under the supervision of MBNP.
The types planted are tree stands with seasonal crops, including for the purpose of restoring the condition of the area as before (Subaktini, 2006).One of the managed areas is located in the rehabilitation zone of the Donglo Block, Resort of Wonoasri MBNP.The condition of this area also has the potential to be disturbed due to the presence of exotic plants.
Exotic plants are plants are imported or included in an area (Supriatna, 2008).
Besides being intentionally introduced by humans, some exotic plants also have the ability to colonize naturally.Exotic plants that can colonize naturally generally have light seeds, so they are easily carried by the wind or carried away by rainwater (Tjitrosoedirdjo et al., 2016).The spread of exotic plants has a huge influence on the biodiversity of the ecosystems they enter.
The presence of this exotic plant has the potential to become an invasive species in an area if the plant undergoes very rapid development.It of course can cause disturbances and threats to the ecosystem, as well as have a negative effect on the community endemic plants (Diah et al., 2013;Permadi & Harahap, 2019).(Robiansyah, 2013)  The species S. nodiflora is an exotic plant originating from South America (Susilo, 2018).These plants have broad leaves and reproduce by seeds.Based on research (Setyowati, 2007) this species can produce about 6,330 seeds per individual, making it easier for this plant to dominate the area it grows.This dominance is one of the factors that an organism can cause harm to an ecosystem.Some reports state that the species S. nodiflora belongs to the species category invasive (Susilo, 2018;Utami and Murningsih, 2018).
Based on the explanation above, it is significant to study the distribution pattern of this exotic plant, as an early detection effort in handling exotic species that have the potential as invasive species.
The objective of this research is to determine the distribution pattern of exotic S. nodiflora plants in the rehabilitation zone of the Donglo Block, Resort, of Wonoasri MBNP.nodiflora species grew.

RESULTS AND DISCUSSION
The results of the Morisita index   2.
stated that the distribution of exotic plants is considered as one of the factors causing the extinction of plants in the world.Based on the results of 2020 survey, one of the exotic plants found in the Rehabilitation Zone of the Donglo Block is cinderella weed (Synedrella nodiflora) and based on (Susilo, 2018) these plants are potentially invasive in MBNP.
This research was carried out in March -December 2020.Data were collected in the Rehabilitation Zone of the Donglo Block, Resort of Wonoasri MBNP (Figure 1).Description and data analysis was conducted at the Ecology Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Jember.

Figure
Figure 1.Research Location

Figure
Figure 1.Research Location analysis showed a value of Iδ = 7.13, which indicate the distribution pattern of the plants was grouped because the value of Iδ> 1.It can also be seen in the results of mapping the distribution pattern of S. nodiflora (Figure 2).The map explained that S. nodiflora at the study site grew in clusters.It can be influenced by biotic and abiotic factors.

Figure 2 .
Figure 2. Distribution Pattern of the Exotic Plant Synedrella nodiflora wasalso possible to find the presence of the Pueraria javanica species which was deliberately planted by the farmers in the rehabilitation area.Therefore, the S. nodiflora species was still not included in the invasive species category in the Donglo Block, Resort of Wonoasri MBNP.However, these plants had the potential to become invasive plants in the future if there was no special treatment.CONCLUSION The conclusion of this study is that the distribution pattern of the exotic plant population of S. nodiflora L. Gaertn in the Donglo Block, Resort of Wonoasri MBNP area was clustered.It was supported by the distribution pattern map of S. nodiflora.The area of coverage of S. nodiflora L. Gaertn at the study site still did not dominate, so it has not been included in the invasive plant category in the Donglo Block, Resort of Wonoasri MBNP.

Table 2
Central Java, but in the Donglo Block area, S. nodiflora was still not found dominate.It