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| 1 | Tree species composition and diversity in montane forests of Garhwal Himalaya in relation to environmental and soil properties显示文摘The montane forests of Garhwal Himalaya were investigated for tree species composition and diversity in relation to environmental and edaphic variables.A stratified random sampling approach was adopted to collect the field data from each forest.A total of 39 tree species belonging to 31 genera and 23 families were recorded from the sampling area(6 forest stands ×10 plots in each).Lauraceae with 5 species was the largest family while Quercus(4 species) emerged as the largest genus.Species-area curve(asymptote) predicted more species than the observed number of species.Cluster analysis has shown that the two Abies pindrow dominant forest stands had the highest similarity in tree species composition.The tree stem density ranged from 540-1170 ha-1,basal area 23.01-55.94 m^2 ha-1,ShannonWiener diversity index 1.69-2.49,evenness index0.42-0.74,beta diversity 0.40-0.82 and similarity index 0.17-0.54 in the six studied forests.Two-way indicator species analysis(TWINSPAN) identified four distinct tree communities in the study area with Daphniphyllum himalayense,Abies pindrow,Quercus oblongata,and Pinus roxburghii as indicator species of corresponding communities.Canonical correspondence analysis(CCA) ascertained the TWINSPAN results and revealed the relation of tree species with environmental and edaphic variables.The phytosociological attributes of tree species varied from one forest stand to another;however,the tree species richness,density,and diversity peaked at intermediate elevation on the north aspect.Findings reveal that tree composition and diversity in the montane forests of Garhwal Himalaya are influenced by both environmental(elevation and slope aspect)and soil variables(texture,water holding capacity,moisture content,available N,exchangeable P,and pH).This study will help in understanding the forest distribution across the western Himalaya,guiding the conservationists and policymakers in carrying out conservation-related management activities,designing the long-term monitoring studies and assessing the effects of ongoing and future climate change and disturbances. | Dinesh Singh RAWAT P.TIWARI Sudipta Kumar DAS J.K.TIWARI | 2020 | Journal of Mountain Science2020，17，12： | 2 |
| 2 | 吉贝和攀枝花对温度升高的生理响应显示文摘以吉贝和攀枝花的半年生幼苗为材料,研究了2种植物随温度升高的生理变化。结果表明:吉贝和攀枝花的相对电导率都随温度升高而升高,其高温半致死温度分别为47.4℃和49.6℃。45℃处理后吉贝的叶绿素b和叶绿素(a+b)显著升高,37℃处理类胡萝卜素含量显著提高;随温度升高,攀枝花的叶绿素含量及其组分无显著变化,但类胡萝卜素含量也从37℃开始显著升高。45℃处理后,吉贝和攀枝花的初始荧光均显著升高,最大荧光及最大光化学效率均显著下降,但吉贝比攀枝花的变化幅度更大。2种植物的丙二醛含量随温度升高均呈上升趋势,其中吉贝的上升幅度大于攀枝花的上升幅度,但各温度处理间差异不显著。随着温度升高,吉贝的可溶性糖含量和脯氨酸含量及攀枝花的可溶性糖含量均无显著变化,攀枝花的脯氨酸含量显著升高。因此,攀枝花比吉贝的抗热性稍强,2种植物对温度升高的响应存在一定差异。 | 郑艳玲 马焕成 | 2017 | 西南林业大学学报(自然科学)2017，37，3： | 0 |
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