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Abstrak :
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 di dan pada setiap petak dilakukan pengukuran terhadap anakan pohon ( diameter 2-5 cm), yang meliputi diameter setinggi 20 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 sebagai jenis dominan 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. ini menunjukan danya penyebarann jenis tertentu pada habitat tertentu pula, menunjukan adanya ketertarikan antara keberadaan suatu jenis dengan habitattertentu. ketinggian tempat dan penutupan kanopi diduga sangat berpengaruh terhadap terbentuknya tipe komunitas.

Abstrak :
Acacia catechu (Sha)-bearing forests are the primary sources of cutch, a tannin extract from the heartwood of Sha trees. Sha forests in Myanmar are managed for cutch production, and tree harvesting for cutch is regulated by an official diameter limit (ODL, 30 cm DBH [diameter at breast height]). We explored sustainable Sha forest management for cutch production through stand inventory surveys and informal interviews with locals and forest managers. We compared Sha forests with six different official harvest histories and assessed seedlings and saplings as well as the size and species of harvested stumps and remaining trees. We found that the forest understory was disturbed by surface fire, and all Sha seedlings and saplings < 1.7 m in height showed post-fire marks. We observed a regeneration gap between 1.7 m and 2.7 m, which might indicate the flame height of the surface fire. The “illegal” harvest exceeded the official harvest; only 5% of the harvested stumps were found to be larger than the ODL. Local harvesting of cutch appeared to be limited by the stem diameter required for heartwood formation (15 cm DBH). Stump data revealed that the forests were utilized not only for cutch but also for other purposes, including fuel and timber. Despite fire and local harvesting, local forest utilization patterns appear to be reasonable, although they are illegal. Implementing fire control and community management of forests along with clear definition of property rights could help in sustainably managing Sha forests for cutch production.

Abstrak :
ABSTRAK
Penelitian bertujuan untuk mengetahui struktur dan komposisi komunitas jenis tumbuhan bawah di areal Taman Nasional Gunung Gede Pangrango.° Penelitian dilakukan di tiga lokasi yaitu lereng bawah, lereng atas, dan punggung bukit.° Pengumpulan data dilakukan dari bulan April hingga September 1999.

Pencacahan flora menggunakan metode berpetak dengan 2 buah transek sepanjang 275 m. Pada setiap transek dibuat 25 petak berukuran lx1 m dengan jarak 10 m antar petak.

Hasil pencacahan tumbuhan bawah pada 150 petak lx1 m2 di tiga lokasi penelitian Gunung Masigit mencatat 43 jenis tumbuhan yang tergolong ke dalam 39 marga dan 35 suku, dengan jenis-jenis utama Dipteris conjugata, Blechnum finlaysonianum, Impatiens javensis, tlrena lobata, Reds sp, Elatostemma sp, Smilax zeylanica, Schima wallrchrr, Phaius sp, Vitis adnanta, Dendrochyllum sp, Cyperus sp.

Sebaran jenis tumbuhan bawah di lokasi penelitian, khususnya di Lereng Bawah dan Punggung Bukit, sangat heterogen. Penyebaran jenisjenis tertentu umumnya tidak terkait dengan sebaran jenis-jenis iainnya. Komunitas tumbuhan bawah di Lereng Bawah dan Lereng Atas dapat disebut sebagai komunitas Dipteris conjugate, sedangkan di Punggung Bukit disebut asosiasi D.conjugata-B.fnlaysonianum. Karakteristik tumbuhan bawah di lokasi penelitian menunjukkan bahwa komunitas tumbuhan di sana telah mengalami gangguan. Kadar air lapangan yang dimiliki jenis-jenis dominan seperti Dipteris conjugata dan Blechnum finlaysonianum, yang hanya sekitar 30 %, memiliki resiko.tjnggi terhadap bahaya kebakaran.

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ABSTRACT
Composition and Structures Community Lowland Fires in Gunung Masigit and Preliminary Study of Natural Regeneration Forest Fire Gunung Masigit, G. Gede-Pangrango National ParkGunung Gede Pangrango National Park, is one of the Long-term Ecological Research Site in Indonesia. In the late 1997, the fires have burnt and destroyed nearly 300 ha forest in this park . Of nine location of hot spots recognized G.Masigit was the largest burnt area with the tot& of 250 ha . Undergrowth vegetation got the most severe impacts. Almost undergrowth vegetation in various location in study site were totally burnt. However, with in three months following burning new seedlings such as Omalanthus populneus, Macaranga tanarius , Trema orientalis appeared in the forest floor.°

Abdulhadi et al. (1999) reported that those species were found as the component of seed bank in a permanent plot of this forest. Thus, it is believed that those seedlings might be recruited from seed bank or seed rain.

The objective of the research is to find out the composition and structure of undergrowth forest a community after forest fire in Gunung Masigit, G. Gede-Pangrango National Park.

Data collection were carried out between April and September 1999 at three areas, i.e. upper slope, lower slope, ridge. Four transects of 275 m were established within each site; each two transects established in burnt and unburnt forest. A long the each 275 m transect 25 plots of l x1 m were established with the interval of 10 m.

A total of 43 species belong to 39 genera and 35 families were recorded within 150 plots of unburnt sites. The dominant species of the unburnt sites were Dipteris conjugata, Blechnum fnlaysonianum, Impatiens javensis, Urena lobalata, Pteris sp, Elatostemma sp, Smilax zeylanica, Schima wallichii, Phaius sp, Vitis adnanta, Dendrochy1/um sp, Cyperus sp.

Based on their important value indices (I V I) the plant communities in lower and upper slopes were called Dipteris conjugata community, while in ridge site was an association of D_conjugata and Blechnum fin/aysonianum. The composition of undergrowth forest community observed during this study clearly indicated that G. Masigit has experienced some kind of disturbance before the fire in the late 1997.

Field water capacities of the dominant plants of the undergrowth forest were about 30 %. It is believed that this condition makes the forest is under high risk of fires.

The species richness of born sites was higher than in unburnt sites due to occurrence of the secondary species such as Melastoma balatrichum and Omalanthus populneus, that were not found in the unburnt site. There were 38 species found on the ridge, as the richest site, followed by upper slope 33 species , and the lower slope 21 species. Based on the life form, the undergrowth species in burning area can be classified to 18 species of trees, 6 species of shrubs, 9 species of lianas, 15 species of herbs, and 5 species of ferns.

The undergrowth forest community in burnt sites was dominated by herbs and ferns indicated that the community was still in an early succession. The LVI of plant communities in burnt site showed that the lower slope was the association of Pteris sp-Flatostemma sp., the upper slope was a community of Cyperus sp, and the ridge was the association of Cyperus sp-Pteris sp.

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