Judul: Komposisi Jenis dan Struktur Hutan di Taman Hutan Raya Dr. Moh. Hatta, Padang, Sumatera Barat
Abstrak: According to Law of Republic of Indonesia No. 5 of 1990, the Forest Park is a nature conservation area which collects natural and unnatural plants and animals. The composition and structure of stands can be used to estimate the density of trees in various diameter classes. This study aims to determine the composition and structure of the vegetation contained in the block protection, utilization, and collection. The research was conducted from January to February 2021 at Bung Hatta Forest Park Conservation Area Padang. The research result show that dominant type found in the protection block for the tree’s level was Glochidion obscurum. In the utilization block, the dominant type called Pinus merkusii, then in the collection block dominated by Swietenia macrophylla. The diversity index value (H') on the three blocks is classified as the moderate with H' value between 1-2. Meanwhile, the wealth index is classified as the low with a value of R1 <3.5. The result also found that the pattern of species distribution is clumped. The stratification of Bung Hatta Forest Park Conservation Area’s crown is in the B and C stratum.
Keyword: H', dominant type, composition, R1, vegetation structure

Judul: Komposisi Jenis dan Struktur Tegakan di Hutan Penelitian Haurbentes Jasinga, Kabupaten Bogor
Abstrak: The Haurbentes Special Purpose Forest Area which functioned as a reaserch forest has various types of stands. This study was purposed to obtain informations on the species composition and stand structure in Harbuentes Research Forest. Unit samples taken by using purposing sampling method on 20 ha Haurbentes forest area. Observed variables in this study are number of vegetation individuals for seedlings and saplings, also diameter and number of individuals vegetation level from trees which diameter greater than 10 cm in 10 m x 50 m pots with seedlings, saplings and tree measuring on each type. Estimation of forest stands potential calculated with Dipterocarpaceae volume estimation and Berkhout linier transformation equation. Based on the observation, biodiversity index forest (H') in Haurbentes Research Forest for all levels of growth were categorized as moderate classification since it had biodiversity index forest values between 1,5 to 3,5. The species richness for seedling and trees growth rate were categorized as low classification and the sapling growth rate were categorized as high classification. The highest number of plants was founded in sapling growth rate and the lowest number of plants was founded in seedling and trees growth rate, with the value of 20 species of seedling, 51 species of saplings and 15 species of trees. Species of Shorea mecistopteryx was the dominant species at every stages of growth because these species are found in large numbers and spread almost evenly throughout the area. The stand structure of Haurbentes Forest was characterized as the larger the size of the diameter of the rod the more reduced the number of individuals of the species (the inverted "J" letter curve graphic). Based on 2012 tree treatise at the Haurbentes research forest in the area of 20 ha were found 2987 trees. Total of Dipterocarpaceae wood volume potential obtained in Haurbentes research forest is 592,77 m3 or 29,64 m3/ha.
Keyword: stand structure, species composition

Judul: Alternatif Media Kultur dan Model Infeksi Leucocytozoon caulleryi Menggunakan Telur Embrio Tertunas.
Abstrak: This research was designed to understand utilization of embryonated egg as cultivation media and infection model of parasite Leucocytozoon caulleryi. An examination included percentage of parasitemia and leukocyte differential of chicken embryo. This research used 24 embryonated egg which were inoculated with gametocytes of L. caulleryi via chorioallantoic membrane (CAM) and allantoic cavity (AC) route. Inoculation were done at 13 days old and blood smear of embryo were done at 16, 17,18, and 19 days old. The result showed significant different of inoculation route and each embryonated egg’s age. Inoculation route via CAM showed higher parasitemia than AC. The highest of parasitemia were showed at 19 days old of embryonated egg (6 days post-inoculation) both CAM and AC. Percentage of leukocyte differential showed significant different of both inoculation route and embryo’s egg on 16, 17, 18, and 19 days old. Both CAM and AC route showed same percentage of lymphocyte as the highest percentage followed by heterophil, monocyte, basophil, and eosinophil. Thus, embryonated egg could be used as alternative cultivation media with chorioallantoic membrane as better inoculation route and infection model which was showed by imune response from leukocyte differential.
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