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Variation in structure and composition of two pine forests in Kailash Sacred Landscape, Nepal

C. K. Subedi , J. Gurung2, S. K. Ghimire3, N. Chettri2, B. Pasakhala2, P. Bhandari1 and R. P. Chaudhary1
Chir pine (Pinus roxburghii Sarg.) and blue pine (Pinus wallichiana A.B. Jacks.) are the major constituents of forests in the Mid-hills of Nepal where households largely depend on forest resources for their livelihoods and subsistence. It is important to know forest structure and species composition and the relationship between different community characteristics of forest for forest management and developing conservation strategies. This study aimed to know the variation of species composition and relationship between different forest community characteristics in two pine forests in Kailash Sacred Landscape (KSL) Nepal. Quadrat sampling was adopted to collect baseline information. IBM SPSS was used for data analysis. There were altogether thirty one plant species belonging to twenty eight genera and twenty families in P. roxburghii forest and thirty eight plant species belonging to thirty seven genera and nineteen families in P. wallichiana forest. Mean DBH, height and canopy diameter of P. roxburghii was 23.98 cm, 12.77 m and 1.97 m, respectively and that of P. wallichiana was 31.5 cm, 11.48 m and 2.79 m, respectively. In both forests DBH and height class distribution showed hump shaped (unimodal type) size distribution with greater proportion of medium-sized individuals indicating disruptive regeneration. The relationship between DBH and height and DBH and crown diameter showed strong relationship in both forest types. Fire and trees cut were significant disturbance factors in P. roxburghii forest, while grazing and trampling were significant in P. wallichiana forest. The extent of these disturbance factors as determinants of regeneration and species recruitment is important to assess for effective forest management.
Community characteristics, disturbance, forest structure, Pinus roxburghii, Pinus wallichiana

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