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Jurnal Sylva LestariJurnal Sylva Lestari

This study aimed to observe and compare the qualitative anatomical characteristics of compression (CW), lateral (LW), and opposite (OW) woods in the stem wood of Sumatran pine (Pinus merkusii) and Agathis (Agathis loranthifolia). The anatomical characteristics were observed using optical microscopy and scanning electron microscopy. CW showed a gradual transition from earlywood to latewood in both species, circular tracheid shape, many intercellular spaces, irregular tracheid tips, helical cavities, and slit-like bordered pits. CW of Sumatran pine showed an indistinct growth ring, while CW of Agathis showed a distinct growth ring. Helical ribs occurred only in CW of Sumatran pine. LW and OW showed an oval tracheid with an angular outline, regular tracheid arrangement, and tapered tracheid tips in both species. LW and OW showed mainly uniseriate bordered pits in Sumatran pine, while LW and OW of Agathis frequently showed multiseriate bordered pits. CW, LW, and OW showed fusiform and uniseriate rays in Sumatran pine, while those of Agathis showed uniseriate rays. In conclusion, CW showed distinctive qualitative anatomical characteristics to LW and OW in both species, while LW and OW mainly showed similar characteristics. In particular, there were considerably distinctive characteristics between CW from both species.

Compression wood of both species exhibited distinct qualitative anatomical characteristics compared to lateral and opposite woods, while the latter two generally showed similar features.Notably, differences were observed in compression wood between the two species.Specifically, Sumatran pines compression wood displayed an indistinct growth ring, whereas Agathiss compression wood showed a distinct growth ring.Furthermore, helical ribs were present only in the compression wood of Sumatran pine.

Penelitian lebih lanjut perlu dilakukan untuk menginvestigasi hubungan antara karakteristik anatomis reaksi kayu pada Pinus merkusii dan Agathis loranthifolia dengan sifat fisik dan mekaniknya, sehingga dapat memprediksi potensi penggunaan kayu tersebut dalam industri. Selain itu, studi komparatif yang lebih mendalam mengenai reaksi kayu pada berbagai spesies konifer tropis lainnya perlu dilakukan untuk memahami adaptasi pohon terhadap tekanan lingkungan dan mengembangkan strategi pengelolaan hutan yang lebih efektif. Terakhir, penelitian mengenai pengaruh teknik silvikultur terhadap pembentukan reaksi kayu pada kedua spesies ini dapat memberikan informasi berharga untuk mengurangi cacat kayu dan meningkatkan kualitas produk hutan, dengan mempertimbangkan faktor-faktor seperti kerapatan tanam, pemupukan, dan pemangkahan.

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