کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4381504 | 1304074 | 2011 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Distribution pattern of trees along an elevation gradient of Eastern Himalaya, India
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Distribution pattern of trees along an elevation gradient of Eastern Himalaya, India Distribution pattern of trees along an elevation gradient of Eastern Himalaya, India](/preview/png/4381504.png)
چکیده انگلیسی
We examined the patterns of tree species richness, density and basal area in the Eastern Himalayan elevation gradient, and evaluated the roles of geometric constraints and environmental factors for the observed pattern. We followed the quadrat sampling method for this study at 23 different locations along a 300-4700Â m elevation gradient in Sikkim. We used regression analysis to establish elevational pattern of trees (species richness, density and basal area) and to relate environmental factors with tree species and density. We also tested geometric constraints on species distribution by comparing empirical species richness with null model predictions generated by a Monte Carlo Simulation Programme (McCain, 2004). We observed a total of 3874 individual trees belonging to 171 species and 58 families. Tree species richness depicted unimodal pattern with a peak at 1500Â m, whereas basal area peaked at 1900Â m. Although density did not follow a uniform pattern, maximum value was observed at 3050Â m. Climatic and energy related factors-rainfall, temperature, moisture index (MI) and actual evapotranspiration (AET)-correlated positively with tree species richness. The Mid-domain effect null model showed significant deviation of empirical richness from simulated species richness. Stepwise regression revealed that combined effects of energy (surrogated by temperature), productivity (surrogated by AET) and precipitation (reflected by MI) influenced observed tree species patterns in the Eastern Himalayan elevation gradient although historical and spatial factors might interplay.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Oecologica - Volume 37, Issue 4, JulyâAugust 2011, Pages 329-336
Journal: Acta Oecologica - Volume 37, Issue 4, JulyâAugust 2011, Pages 329-336
نویسندگان
Bhoj Kumar Acharya, Basundhara Chettri, Lalitha Vijayan,