Permudaan Alami Dalam Hutan Bekas Tebangan Di Sekundur, Sumatra Utara

A phytososiological analysis of saplings was made using quadrate method in the six yearsold logged-over forest at Sekundur, North Sumatra. The results showed that within 0.2hectare plot, 123 species belonging to 79 genera and 36 families were recorded. Threecommunity types were recognized, i.e. Agrostistachys longifolia - Teijsmanniodendronsarawakanum, Macaranga hypoleuca - Macaranga pruinosa and Endospermummalaccensis - Macaranga javanica communities. The structure and floristic compositionof each community varies and they were related primarily with the forest distur¬bance.There were found that the number of both species and individuals of sapling decreasedwith increasing of the forest disturbanc

Komposisi Flora Dan Struktur Hutan Alami Di Pulau Ternate, Maluku Utara

Vegetation Analysis of Natural Forest in Ternate Island, North Maluku. A vegetation analysisof the Ternate natural forest has been conducted by establishing 9 plots of each 30-m x 30-m.All trees (dbh. e”10 cm) within all plots were measured, their positions were determined, andtheir species were identified. In total there were 68 tree species recorded within plots belongingto 34 families. Trichospermum morotainense was the most common species, followed byAlbizia falcataria, Elmerilla ovata, Cordia mixa, and Macaranga longicaudatum. Almost allof the common species such as A. falcataria, Tristiopsis canarioides, Pometia pinnata, E.ovata and Intsia bijuga were found as emergent or canopy trees. According to the ordination(DCCA) analysis there were at least three tree species associations which were related tohabitat characteristics (conditions). However the population\u27s dominant species varied amongsites, which might be related to the habitat characteristics and/or effects of human activities inthe past

Penelitian Ekologi Hut an Lahan Pamah Di Barito Ulu, Kalimantan Tengah: II. Serasah Dan Kandungan Haranya* [Ecological Studies of Lowland Forest in Barito Ulu, Central Kalimantan: II. Litterfall and Nutritional Content]

A study on litterfall and their nutrient content has been conducted in the Barito Ulu research station, Central Kalimantan. Five plots of 50m x 50m were established to describe the forest structure and floristic composition. In each plot 10 of 1m x 1m litter-traps were emplaced on 25-28 April 1994, and litterfaii (ieaves, branches, flowers+fruits and miscellaneous) was collected twice at the mid and the end of month from May 1994 until May 1995. The litterfall chemical analyses were made for sampbs collected in May, June, July 1994 (dry season) and November and December 1994 and January 1995 (wet season). The mean annual total litterfall in the five plots was 8,4 t ha\u27 yr< (range 7,3-9,5). The total litterfall was highest in October 1994 coinciding with the later part of dry season. The litterfall mineral-element concentrations and accession were below or within the range reported for other tropical forests. On the basis of Vitousek litter nutrient concentration hypothesis phosphorus tended to be more efficiently used than nitrogen.This means that growth of forest would be expected to be more limited by phosphorus. However the results of fertilization experiment in this forest suggested that primary production of forest might be more limited by nitrogen. This is a new information that primary production of lowland tropical forest was also limited by nitrogen. The results in detail of the fertilization experiment will be published separately

Ekologi Hutan Pamah Barito Ulu, Kalimantan Tengah: Respon Terhadap Pemupukan Nitrogen Dan Fosfor*[ecology of Lowland Forest in Barito Ulu, Central Kalimantan: Response to Nitrogen and Phosphor Fertilization ]

A fertilization was set up in September 1993 in species-rich dipterocarp forest in the Barito Ulu study site in Central Kalimantan.The experiment was unusual in that previously reported fertilizer experiments have been made in montane forest. The following treatments were applied: control, +N, +P and +NP. There were five blocks of four 50m x 50m plots with a separate treatment for each plot. Fine litterfall was collected on all of the plots from May 1994 for one year. There was evidence of higher litterfall quantities and increased of P and N in the litterfall. All trees (> 10 cm dbh) were measured in August 1993 and in July 1994 and there was a clear girth increment response of some dipterocarp species to +NP and small size of trees to +N

Penelitian Ekologi Hutan Di Pulau Natuna: Status Hara Daun Dan Serasah [Forest Ecological Studies in Natuna Island: Leaf and Litter-fall Nutrient Status]

Forest ecological study with special attention to leaf and litterfall nutrient status has been conducted in several forest types at Natuna Island, Riau Archipelago. Ten plots have been setup which distributed in several forest type areas. Fresh leaf was collected from some dominant tree within the plots, whereas fallen leaves collected from litter traps.Nutrient content especially for N, P, K and Ca analyzed from all combined species of both fresh and fallen leaves.Results of chemical analyses showed that all fallen leaves mineral element concentration, except for Ca,were lower than that in fresh leaf. Presentage of retranslocation of both nitrogen and phosphorus tended to be similar to some earlier studies in several tropical forests. Nitrogen and phosphorus were suspected to be limiting factors of forest growth in this area

Permudaan Alami Kawasan Hutan Resort Cidahu, Taman Nasional Gunung Halimun–salak, Jawa Barat

Kajian permudaan alami di kawasan hutan Taman Nasional Gunung Halimun–Salak, Jawa Barat telah dilakukan dengan tujuan untuk mengungkap pola dan proses ekologi serta suksesi hutan. Sebanyak 27 petak (10 m x 10 m) telah dibuat dan pada setiap petak dilakukan pengukuran terhadap anakan pohon (diameter 2–5 cm), yang meliputi diameter setinggi 50 cm di atas tanah, tinggi dan posisi di dalam setiap petak. Setiap jenis yang tercatat dibuat spesimen bukti ekologi, untuk identifikasi jenis. Dalam 27 petak tercatat paling tidak sebanyak 73 jenis anak pohon,yang terdiri atas 51 marga dan 29 suku. Macaranga triloba tercatat sebagai jenis dominan hanya pada 9 petak, sedangkan 4 jenis lainnya kurang dari 5 petak. lni menunjukkan adanya variasi komposisi jenis antar petak yang tinggi, yang berkaitan dengan kondisi habitatnya. Adanya penyebaran jenis tertentu pada habitat tertentu pula, menunjukkan adanya keterkaitan antara keberadaan suatu jenis dengan habitat tertentu. Ketinggian tempat dan penutupan kanopi diduga sangat berpengaruh terhadap terbentuknya tipe komunitas

Analisis Vegetasi Hutan Pamah Di Pulau Batanta, Raja Ampat, Papua

Vegetation Analysis of Lowland Forest in Batanta Island, Raja Ampat, Papua. A vegetationanalysis of Batanta lowland forest has been made by setting up 17 plots of each 30-m x 30-mdistributed in 3 study sites were Yenanas (5 plots), Yensawai (7 plots) and Wailebet (5 plots).All trees (dbh. e”10 cm) within all of 17 plots were measured, and determined their positions,and identify their species. In total there were 171 tree species recorded within plots andbelonging to 108 genera and 40 families. Pometia pinnata was the most common speciesfollowed by Anthocephalus macrophyllus, Pangium edule, Toxotrophis illicifolius, andKoordersiodendron pinnatum. Almost all of common species such as Pometia pinnata,Anthocephalus macrophyllus, Celtis hidebrandii and Intsia bijuga were observed as theemergent and/or canopy trees. According to ordination analysis there were five communitytypes, Aporusa–Pometia, Antocephalus-Toxotrophis, Sterculia-Grewia, Ficus-Antocephalus,and Duabanga-Pterocymbium communities. However floristic compositions varied amongplot sites, which might be a characteristic of vegetation of Papua and the nearby small islands

Komposisi Floristik Dan Struktur Hutan Di Pulau Natuna Besar, Kepulaun Natuna

Ecological study has been conducted in the forest area of Natuna Island to reveal the structure and composition oftree species. In the 10 plots of 20 x 40 m each, there were 141 species of trees, with a density of 504 trees / ha and12.35 m2/ha of basal area, which was distributed in three forest types. Myrtaceae was the most common family,followed by Euphorbiaceae and Dipterocarpaceae. On the other hand Arthrophyllum javanicum recorded as themost common species together with Syzygium aemum and Ilex pleiobrachiata. The existence of each of the common speciesvaries in each forest type that shows there was a correlation between the condition of the habitat and the presence ofspecies