Evaluation structural diversity of Carpinus betulus stand in Golestan Province, North of Iran

VAHAB SOHRABI, RAMIN RAHMANI, SHAHROKH JABBARI, HADI MOAYERI

Abstract. Sohrabi V, Rahmani R, Jabbari S, Moayeri H. 2011. Evaluation structural diversity of Carpinus betulus stand in Golestan Province, Northern Iran. Nusantara Bioscience 3: 23-27. In order to investigate structural diversity of Carpinus betulus type in Golestan province 30 modified Whittaker plots by systematic random system were located. Per plot the characteristic of trees and shrubs species (Species name, diameter and height of trees) are recorded. The heterogenity indices of Simpson, Shannon–Wiener, Simpson’s reciprocal and number of equally common species were used for the quantitative data. Toward better understand from diversity condition in horizontal and vertical composition of stand, the diameter divided in 10 cm classes and Method of Mohajer and the height divided in 10 m height classes and dominant height, then number of diversity of each class extracted by Ecological Methodology software V.7. The results showed with increase of diameter and height classes, decrease species diversity. Also regeneration layers diversity has significant difference with trees layers. Thus, the study of biodiversity changes in different diameter and height category cause ecologically precise
perspective in management of forest stands.
Key words: structure diversity, indices diversity, diameter and height classes.

Abstrak. Sohrabi V, Rahmani R, Jabbari S, Moayeri H. 2011. Evaluasi keragaman struktur tegakan Carpinus betulus di Provinsi Golestan, Iran bagian utara. Nusantara Bioscience 3: 23-27. Dalam rangka untuk menyelidiki struktur keragaman tipe Carpinus betulus di provinsi Golestan, 30 plot Whittaker yang telah dimodifikasi dibuat secara sistem random sistematis. Pada setiap plot, karakteristik spesies pepohonan dan semak (nama spesies, diameter dan tinggi pohon) dicatat. Indeks heterogenitas dari beberapa macam indeks Simpson, Shannon-Wiener, Simpson’s reciprocal dan jumlah spesies yang umum ditemukan digunakan untuk data kuantitatif. Untuk lebih memahami kondisi keanekaragaman dalam tegakan horizontal dan vertikal, maka dikelompokkan ke dalam diameter dalam kelas 10 cm, metode Mohajer, tinggi dalam kelas 10 m, dan ketinggian yang dominan, kemudian jumlah keragaman setiap kelas ditentukan dengan software Ecological Methodology v.7.0. Hasil penelitian menunjukkan bahwa peningkatan kelas diameter dan tinggi, menyebabkan penurunan keragaman spesies. Keragaman lapisan regenerasi memiliki perbedaan signifikan dengan lapisan pohon. Studi perubahan keanekaragaman hayati dengan kategori diameter dan tinggi yang berbeda memerlukan perspektif ekologis yang tepat dalam pengelolaan tegakan hutan.
Kata kunci: keanekaragaman struktur, indeks diversitas, kelas diameter dan tinggi.

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