Spatial Distribution and Floristic Composition of Overstorey Vegetation in Zanthoxylum Armatum DC inhabited sites of Jammu & Kashmir, India

Abstract

The spatial distribution and floristic composition of an area is the outcome of various environmental factors, and needed to be studied for assessing the macro-ecological biodiversity patterns and framing a strategy for biological conservation. The present study was conducted in three Zanthoxylum armatum DC inhabited sites located in Kathua (Bhaddu and Sukrala) and Udhampur (Dhandal) districts of Jammu and Kashmir with aims of studying the distribution, ecological status, composition, and diversity of overstorey vegetation, especially Zanthoxylum armatum , and to define the soil attribute/s responsible for these characteristics of vegetation. The results of the study show that aggregate distribution (68.4 - 84.2%) was more common than random distribution pattern (15.8 - 31.6%). Ecological status of more than 50% of the species, including Zanthoxylum armatum , was rare in all the three sites. Quercus leucotrichophora , Pinus roxburghii and Pyrus pashia recorded the highest values for importance value index (IVI) in Bhaddu, Sukrala and Dhandal, respectively. As per Dominance-Diversity Curves, the most dominant species were following the geometric curve and hence utilizing bulk of the resources in the respective sites whereas other species were log normally distributed. Dhandal was the most diverse site having the highest values for species richness (19) and Shannon-Wiener’s index (2.59). The Canonical Correspondence Analysis depicted that Zanthoxylum armatum along with Cu at Axis I and available K at axis II were the driving variables responsible for the distribution, diversity, and floristic composition of overstorey vegetation in the present study.