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An assessment of population structure and regeneration status of Magnolia punduana Hk. f. & Th.(Magnoliaceae) in fragmented forests of northeast India

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Journal of Forestry Research 2020年第3期31卷 937-943页

作者： viheno iralu Ngakhainii Trune Pao Krishna Upadhaya Department of Environmental Studies School of Human and Environmental SciencesNorth-Eastern Hill UniversityShillong 793022India Department of Basic Sciences and Social Sciences School of TechnologyNorth-Eastern Hill UniversityShillong 793022India

The population structure and regeneration status of Magnolia punduana Hk. f. & Th., an endemic tree species of northeast India were investigated in fragmented forests in the Jarain Hills and in adjoining areas of Meghalaya state. The population structure was discontinuous in all the fragments with the absence of individuals in higher diameter classes. The number of individuals increased with the size of the fragment patches(p 105 ha). The number of seedlings and saplings were also higher in the larger fragments. Human-related disturbances had a negative impact on the species population(p<0.002). Variation in the population density in different forest patches has been attributed to fragment size, site characteristics and ongoing human disturbances. The restricted distribution of the species coupled withexploitation and habitat destruction underlines the need for its conservation.

关键词： Conservation Disturbance Fragmentation Magnolia punduana Restricted distribution

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Abundance and habitat-suitability relationship deteriorate in fragmented forest landscapes:a case of Adinandra griffithii Dyer,a threatened endemic tree from Meghalaya in northeast India

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Ecological Processes 2018年第1期7卷 23-31页

作者： Dibyendu Adhikari Aabid Hussain Mir Krishna Upadhaya viheno iralu Dilip Kumar Roy Department of Botany North-Eastern Hill UniversityShillong 793022India Department of Environmental Studies North-Eastern Hill UniversityShillong 793022India Department of Basic Sciences and Social Sciences North-Eastern Hill UniversityShillong 793022India Botanical Survey of India Eastern Regional CentreShillong 793003India

Introduction:A strong positive‘abundance and habitat-suitability’relationship is crucial for conservation of ***,anthropogenic alteration of natural landscapes leading to land use and land cover change,habitat loss,and species extinctions(may)have putatively disturbed this ***,it is important to study the nature of the relationship in such human influenced ***:In this study,we endeavored to understand the consistency of the relationship in the fragmented natural landscapes in the Khasi,Garo,and Jaintia hills of Meghalaya in northeast India,with Adinandra griffithii(an endangered endemic tree)as a model *** reconstructed the distribution of its suitable habitats as a function of the remotely sensed vegetation phenology(i.e.,EVI data),using point occurrence data and ecological niche modeling(ENM)*** of the abundance and habitat characterization was done through field surveys following standard ***:The study revealed that remotely sensed landscape-level vegetation phenology could effectively discriminate the suitable and unsuitable habitats of threatened *** regression model showed a weak positive correlation between abundance and predicted habitat suitability for adult trees indicating(plausible)deterioration in the ***,sapling and seedling populations did not show a precise trend in this ***-based studies revealed that removal of the species from the suitable habitats because of anthropogenic disturbances possibly weakened the abundance-suitability ***:The findings of the study enjoin the need for re-establishment of the species in the suitable areas for its conservation and perpetuation.

关键词： Abundant-center hypothesis Species abundance Habitat suitability EVI ENM

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