Present State and Future Trends of Pine Forests of Malam Jabba, Swat District, Pakistan
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Pak. J. Bot., 47(6): 2161-2169, 2015. PRESENT STATE AND FUTURE TRENDS OF PINE FORESTS OF MALAM JABBA, SWAT DISTRICT, PAKISTAN MUHAMMAD FAHEEM SIDDIQUI1, ARSALAN1, MOINUDDIN AHMED2, MUHAMMAD ISHTIAQ HUSSAIN3, JAVED IQBAL4AND MUHAMMAD WAHAB5 1Department of Botany, University of Karachi, 75270, Pakistan 2Indiana State University, Terre Haute, Indiana, USA 47809-1902 3Centre for Plant Conservation, University of Karachi, 75270, Pakistan 4Department of Botany, Federal Urdu University of Arts, Science and Technology, Karachi 5State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China *Corresponding author e-mail: [email protected]; [email protected] Abstract Present state and future trend of pine forests of Malam Jabba, Swat district, Pakistan explored. We focused on vegetation composition, structure, diversity and forests dynamics. Thirteen stands were sampled by Point Centered Quarter method. Among all stands four monospecific forests of Pinus wallichiana attained highest density ha-1 except in one stand where Picea smithiana attained 401 trees ha-1. Unlike density, the basal area m2 ha-1 of these stands varies stand to stand. Based on floristic composition and importance value index, five different communities viz Pinus wallichiana-Picea smithiana; Picea smithiana-Pinus wallichiana; Abies pindrow-Pinus wallichiana; Pinus wallichiana-Abies pindrow; Abies pindrow-Picea smithiana and 4 monospecific forests of Pinus wallichiana were recognized. Size class structure of forests showed marked influence of anthropogenic disturbance because not a single stand showed ideal regeneration pattern (inverse J shape distribution). Future of these forests is worst due to absence trees in small size classes. Gaps are also evident in most of the forest stands. Stand diversity, richness, equitability and Simpson’s dominance values formulated on single stand basis. Diversity of Abies pindrow and Pinus wallichiana stand was highest because these stand occupied dominant species, while lowest diversity observed in some Pinus wallichiana and Picea smithiana stand as these stands have mark difference between the dominance of two species. In the monospecific forests, the diversity level was zero, suggesting the monopolization of resources by one species or elimination of other tree species in these stands. Key words: Vegetation composition, Structure, Diversity and forests dynamics. Introduction pressure (Ahmad et al., 2006; Shaheen et al., 2011). Similar conclusions were also made by other worker like Distribution and abundance of plant species and Hussain et al. (1997); Sher et al. (2010); Ahmad et al. communities has been related to a range of physical (2010). The coniferous forests in the northern mountain environmental variables especially anthropogenic regions particularly are under the heavy social and disturbance (Enright & Miller, 2007). Civil war badly economic pressure of tree felling (Siddiqui et al., 1999). disturbed the vegetation of the forests under study. The area Some factors like intensive deforestation and unlimited was recently hit by a worst type of so called religious expansion of urban area have considerably reduced the extremism, in which alongside other sectors of society the extent of plant communities’ worldwide (Boza, 1993). forest resources were badly affected (Sharar, 2009). Shafique (2003) described some aspects of Bio-Ecology of According to Ilyas et al. (2012) the remnant temperate Ayubia National park, Khyber Pakhtoonkhwah Province. forests in the form of logging, deforestation, over-grazing Ahmad et al. (2009) and Ahmad (2010) evaluated and clearance of forest for terrace cultivation in district ecological aspects of roadside vegetation around Havalian Swat, Khyber Pakhtunkhwa is under severe anthropogenic city using multivariate techniques and vegetation along pressure. The natural forest cover is decreasing at a rate of motorway (M-2), Pakistan using detrended correspondence 0.75% annually (Anon., 2009). analysis. Ahmed et al. (2006) presented phytosociological Champion et al. (1965) stated the major characteristic and structural description of Himalayan forest from of the humid forests is the development of coniferous different climatic zones of Pakistan. They reported that forests that begin in the northern area in the form of some communities exhibited similar floristic composition subtropical pine forests. The prevalence of species is but different quantitative values, description of understorey largely a function of altitude and the aspect. Hussain & species also recorded. Siddiqui et al. (2013) had undertaken Ilahi (1991) reported that Montane temperate forests in a detailed study of many forests belonging to moist Pakistan are predominantly coniferous in nature with some temperate areas of Pakistan while phytoecological broad leaved species. The structure, composition and evaluation with detail floristic appraisal of the vegetation function of forest ecosystem change in response to climatic, around Malam Jabba, forests was studied by Rashid et al. topographic, edaphic and anthropogenic influences (2011). Wahab (2011) evaluated population dynamics of (Timilisina et al., 2007; Ahmed et al., 2010; Shaheen et al., pine tree species from District Dir while Khan (2011) 2011; Namgail et al., 2012). Like other forest types, studied the Vegetation ecology and Dendrochronology of temperate forests are experiencing severe anthropogenic Chitral Gol National Park. 2162 M.F. SIDDIQUI ET AL., The present study focuses on the vegetation composition, Handheld). Degree of slope angle estimated with the help distribution, diversity, species richness, equitability, of clinometers (Slope Meter PM-5/1520 PC) while site dominance, future trends and relationship of vegetation with exposure was determined through geographical compass. the two topographic factors. Since no such type of information is available from this areas after civil war, considering the Diversity analysis: Shannon & Weaver (1963) diversity increased pressure and threat to ecology and biodiversity of index (H); Krebs (1999); Booth et al. (2003) and Malam Jabba forests, the present study would provide Magurran (2004) used to determine diversity of trees. baseline information on the community structure, species The components of diversity i.e., equitability (J) and diversity and governing factors, for the proper conservation species richness (d) were calculated after (Pielou, 1977) measures of the existing vegetation in the area. and (Menhinick, 1964) respectively while dominance was calculated following Simpson (1949). Statistical analyses Materials and Methods performed following the method described by Zar (2009). Phytosociology: Thirteen stands were sampled by Point Size class structure: The diameter values (dbh) of Centered Quarter Method (Cottam & Curtis, 1956) with the conifer species were classified into following 10 classes: modification of Ogden & Powell (1979). Phytosociological attributes and absolute values of forest were calculated where Class 1 = 10 - 20 cm diameter at breast height (dbh), according to Mueller-Dombois & Ellenberg (1974) and (class 2) = 20.1 – 30 cm, (class 3) = 30.1 – 40 cm, (class 4) = Ahmed & Shaukat (2012). The conifer forests in Pakistan are 40.1 – 50 cm, (class 5) = 50.1 – 60 cm, (class 6) = 60.1 – 70 generally exposed to anthropogenic disturbances, therefore cm, (class 7) = 70.1 – 80 cm, (class 8) = 80.1 – 90 cm, (class least disturbed stands were selected for vegetation analysis. 9) = 90.1 – 100 cm and (class 10) = 100.1 – 110 cm. using In each stand, twenty points has randomly taken with a these classes, dbh/density ha-1 bar diagrams were prepared distance interval of fifty meters from base to uphill direction. for each stand. However, under result section the adjacent Only living trees were included in sampling and the dbh of classes were combined into following four classes: main trunk measured. Six communities and four monospecific forests of Pinus wallichiana were recognized 1. Small size class (10 to 30 cm dbh) using importance value index following Brown & Curtis (1952); Ahmed & Shaukat (2012) which is the sum of 2. Medium size class (30.1 to 60 cm dbh) relative frequency, density and basal area. Tree species that 3. Large size class (60.1 to 90 cm dbh) have highest importance value index was considered 4. Extra large six class (90.1 to 110 cm dbh) dominant. Communities were named based on first two dominant species. Results and Discussion Environmental variables: At all sampling stands some Locations of the sampling stands presented in Fig. 1 important site characteristics (elevation, slope, exposure, while the site characteristics (latitude, longitude, elevation longitude and latitude) were noted with the help of Global of forest, slope angle, aspect and forest canopies) Positioning system (Garmin eTrex Legend HCx presented in Table 1. Fig. 1. Study area map, main locations are shown by red marks while all stands are described in Table 1. PRESENT STATE & FUTURE TRENDS OF PINE FORESTS OF MALAM JABBA SWAT 2163 Phytosociology: Phytosociological attributes and absolute and third dominancy in two stands each with the mean values of tree species from all stands are presented in Table 2 density 125.3 per hectare and 30.4 m² ha-1 mean basal area. while the summary of these attributes are presented in Table Forest communities and range of topographic 3. Summary of phytosociological analysis showed that attributes presented in Table 4. Based