Ecological variables play a significant role in determining the diversity and distribution of any living organism on earth. Lichens are not exceptional and are quite sensitive in comparison to other organisms; hence t...Ecological variables play a significant role in determining the diversity and distribution of any living organism on earth. Lichens are not exceptional and are quite sensitive in comparison to other organisms; hence the present study focuses on the impact of ecological variables on the diversity and distribution of epiphytic macrolichens colonizing Quercus leucotrichophora across eight different sites(50 m × 50 m) in Thal Ke Dhar forest, Kumaun Himalaya, Uttarakhand, India. For sampling of macrolichens, 200 trees(25 trees from each site) of Q.leucotrichophora were selected from each site and five quadrats of 5 cm × 10 cm(1000 quadrats in totality) were drawn at the tree trunk. From all the sampled trees, a total of 54 species of epiphytic macrolichens belonging to 18 genera and five families were recorded. Various ecological variables, namely altitude, aspect, slope, diameter at breast height(DBH), and lopping percent(partial cutting of the twigs as disturbance), were also analyzed to investigate their influence on macrolichen species composition and distribution pattern in the study area. For the determination of relationships between these variables, statistical analysis, namely Pearson's Correlation Coefficient, Polynomial regression analysis and Principal Component Analysis(PCA)were performed. Out of all variables, lopping was significantly correlated to species richness of epiphytic macrolichens(0.712~*, p<0.05) and it was confirmed by Pearson's Correlation Coefficient.Despite of having high anthropogenic pressure or impact through lopping, the maximum number of macrolichen species was recorded at elevation 2267 meter above sea level(m asl). The present study revealed that besides other ecological variables,lopping practices can act as a key parameter incontrolling the diversity and distribution not only of epiphytic macrolichens but also of other life forms such as bryophytes, pteridophytes, insects, birds etc.and can be either negatively or positively correlated.展开更多
Wolong Nature Reserve is located in Wen Chuan county, Sichusn Province, China, at 102°52’103°24’E,30°45’-31°25’N. Wolong, declared a nature reserve in 1975 is 52 km form east to west and 63 km ...Wolong Nature Reserve is located in Wen Chuan county, Sichusn Province, China, at 102°52’103°24’E,30°45’-31°25’N. Wolong, declared a nature reserve in 1975 is 52 km form east to west and 63 km from north to south, with an area of about 200000 hectares. It lies on the northern border of the sub-temperate zone, in the west of the Sichuan basin and east of the Gong Lai mountains. The altitude ranges from 1218 m to 6250 m. Wolong was the first natural panda habitat reserve of the world and has recently been named a United Nations Heritage Site.There and no published records of lichn species from Wolong. and the Natural History Museum inWolong(WL)contains very few lichen specimens. Twenty-four geera and 2 species wene reported. The form valleys and mountain slopes at altitudes between 1600 m and 2300 m in Wolong Nature Reserve in April 1993 the two species, peltigera pindarensis and Ramalina africana, arenew to China(Cf. Wei, 1991). Collection numbers are provided for each species and material has been retained in the herbaria of Chen and Seaward.展开更多
基金Head, Department of Botany, S.S.J. Campus Kumaun University, Almora - 263601 for providing laboratory facilities and G. B. Pant National Institute of Himalayan Environment and Sustainable Development, Kosi-Katarmal, Almora263643 (GBPI/IERP/16-17/16/175) for financial assistance
文摘Ecological variables play a significant role in determining the diversity and distribution of any living organism on earth. Lichens are not exceptional and are quite sensitive in comparison to other organisms; hence the present study focuses on the impact of ecological variables on the diversity and distribution of epiphytic macrolichens colonizing Quercus leucotrichophora across eight different sites(50 m × 50 m) in Thal Ke Dhar forest, Kumaun Himalaya, Uttarakhand, India. For sampling of macrolichens, 200 trees(25 trees from each site) of Q.leucotrichophora were selected from each site and five quadrats of 5 cm × 10 cm(1000 quadrats in totality) were drawn at the tree trunk. From all the sampled trees, a total of 54 species of epiphytic macrolichens belonging to 18 genera and five families were recorded. Various ecological variables, namely altitude, aspect, slope, diameter at breast height(DBH), and lopping percent(partial cutting of the twigs as disturbance), were also analyzed to investigate their influence on macrolichen species composition and distribution pattern in the study area. For the determination of relationships between these variables, statistical analysis, namely Pearson's Correlation Coefficient, Polynomial regression analysis and Principal Component Analysis(PCA)were performed. Out of all variables, lopping was significantly correlated to species richness of epiphytic macrolichens(0.712~*, p<0.05) and it was confirmed by Pearson's Correlation Coefficient.Despite of having high anthropogenic pressure or impact through lopping, the maximum number of macrolichen species was recorded at elevation 2267 meter above sea level(m asl). The present study revealed that besides other ecological variables,lopping practices can act as a key parameter incontrolling the diversity and distribution not only of epiphytic macrolichens but also of other life forms such as bryophytes, pteridophytes, insects, birds etc.and can be either negatively or positively correlated.
文摘Wolong Nature Reserve is located in Wen Chuan county, Sichusn Province, China, at 102°52’103°24’E,30°45’-31°25’N. Wolong, declared a nature reserve in 1975 is 52 km form east to west and 63 km from north to south, with an area of about 200000 hectares. It lies on the northern border of the sub-temperate zone, in the west of the Sichuan basin and east of the Gong Lai mountains. The altitude ranges from 1218 m to 6250 m. Wolong was the first natural panda habitat reserve of the world and has recently been named a United Nations Heritage Site.There and no published records of lichn species from Wolong. and the Natural History Museum inWolong(WL)contains very few lichen specimens. Twenty-four geera and 2 species wene reported. The form valleys and mountain slopes at altitudes between 1600 m and 2300 m in Wolong Nature Reserve in April 1993 the two species, peltigera pindarensis and Ramalina africana, arenew to China(Cf. Wei, 1991). Collection numbers are provided for each species and material has been retained in the herbaria of Chen and Seaward.
