Dominance Diversity Patterns and Regeneration Status of Moist Temperate Forests in Garhwal, Part of the North-west Himalayas, India

印度喜馬拉亞西北部Garhwal濕潤溫帶森林的主要多樣性類型與更新狀態

Seema Semwal ； B. P. Nautiyal ； A. B. Bhatt

《台灣林業科學》 23卷4期 (2008/12) Pp. 351-364

https://doi.org/10.7075/TJFS.200812.0351

摘要

The structure, composition, diversity, and regeneration status of different forest types in a moist temperate region of Garhwal, India were Results revealed that overall diversity increased in Pinus-dominated sites which were characterized by more-open canopies (canopy cover ＜20%) with scattered trees interspersed with young trees, shrub and herb species compared to Quercus forests with a dense crown cover (＞65%). A direct proportional relationship between tree cover and the diversity of sub-stratum vegetation was found; with increasing tree canopy cover, the diversity of shrubs and herbs significantly decreased (r^2=0.72 and 0.83 for herbs and shrubs respectively at p＜0.05). Tree density was maximum in mixed broadleaf-coniferous forests while it declined in oak-dominated forests although vegetation cover was highest in mixed oak-forests. In Pinus forests, with the exception of species this genus others had poor or no regeneration. In general, Pinus roxburghii and Quercus leucotrichophora showed fair regeneration in spite of fire and logging. Tree density showed strong correlations with the densities of seedlings and poles, while sapling density was not significantly correlated that of trees, indicating low sapling density. Observations suggest that conversion of saplings to tree strata is a crucial factor to ensure good regeneration of species in these types of forests.

關鍵字

Pinus roxburghii, Quercus leucotrichophora ； 豐富度 ； 相似性 ； 冠層

並列摘要

The structure, composition, diversity, and regeneration status of different forest types in a moist temperate region of Garhwal, India were Results revealed that overall diversity increased in Pinus-dominated sites which were characterized by more-open canopies (canopy cover ＜20%) with scattered trees interspersed with young trees, shrub and herb species compared to Quercus forests with a dense crown cover (＞65%). A direct proportional relationship between tree cover and the diversity of sub-stratum vegetation was found; with increasing tree canopy cover, the diversity of shrubs and herbs significantly decreased (r^2=0.72 and 0.83 for herbs and shrubs respectively at p＜0.05). Tree density was maximum in mixed broadleaf-coniferous forests while it declined in oak-dominated forests although vegetation cover was highest in mixed oak-forests. In Pinus forests, with the exception of species this genus others had poor or no regeneration. In general, Pinus roxburghii and Quercus leucotrichophora showed fair regeneration in spite of fire and logging. Tree density showed strong correlations with the densities of seedlings and poles, while sapling density was not significantly correlated that of trees, indicating low sapling density. Observations suggest that conversion of saplings to tree strata is a crucial factor to ensure good regeneration of species in these types of forests.

並列關鍵字

Pinus roxburghii ； Quercus leucotrichophora ； richness ； similarity ； canopy