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| 1 | 深圳小南山与应人石山地植物多样性比较研究显示文摘该文对深圳市小南山处在封育状态下的3个植物群落和应人石山地荒弃果林处于半自然恢复状态群落以及果林周边半自然状态发育的群落进行了调查,比较分析两区域植物群落的组成及多样性特征。结果表明:在群落科、属、种的数量组成上,两者的差异虽不很明显,但小南山的科和种类的数量稍多于后者;在群落各层次的种类组成上,则小南山乔木层种类较明显地多于应人石的群落,前者的灌木层及草本层的发育也较好,种类也较多;虽然应人石的灌木层及草本层的种类数也较多,而且灌木层种类数高于前者,但乔木层种类则明显少,草本层种类的数量也略低于小南山的2个群落。在物种的生物多样性Simpson指数、ShannonWiener指数和丰富度指数方面,小南山的3个群落各层次的大多指标及所有的整体指标值均高于后者。这说明小南山在较长期受到人为保护的状态下,植被的结构发育较好,各层次的种类数均较为丰富。而后者虽然是处于半自然状态发育的群落,但由于受到人为干扰和影响的印迹依然还没有消除,仍处在恢复初期或中间状态。这为目前争论较多的究竟是自然林生物多样性高,还是人工林高?或者是人为较多干扰的次生林高的理论问题提供了一个较好的证据和理论参考。在各群落的相似性系数方面,各层次的系数值均处在相对较低状态,表明同区域不同地点及不同区域相互间各群落在种类组成上差异较大,说明深圳这两个区域在大区域范围的植物多样性水平是较高的。 | 黄玉源 余欣繁 招康赛 杨立君 梁鸿 卢云鹤 王贺银 刘浩 明珠 刘念 周志彬 | 2016 | 广西植物2016，36，7： | 8 |
| 2 | Changes of woody species diversity, horizontal and vertical distribution of stems across interior to outside within a primate rich habitat of Northeast India显示文摘The interior forest of protected area(PA)recover quickly in terms of greater diversity and structural complexity than peripheral and outsides, which may be due to high plant-frugivore interactions in the interior forest than the disturbed outsides. To describe the structural and functional differences in tree communities from interior to outside forests with in small PA, we quantitatively analyzed the vegetation of Trishna Wildlife Sanctuary, a rich primate habitat of Northeast India. Vegetation was sampled at C10 cm girth at breast height by 10 m 9 500 m sized20 line transects(10 ha) laid in the interior(N = 7),peripheral(N = 7) and outside(N = 6) zones of this sanctuary. All transects were ordinated by Principal Component Analysis based on correlation between diversity and existing disturbance indices. We found significant differences(P \ 0.05) in taxonomic richness and diversity indices between the habitat. Van diagram confirmed greater unique species richness in the interior zone(64) than peripheral(28) and outside(6) zones. Overall density(ha-1) did not differed across the zones, but basal area(m2ha-1) was significantly(P \ 0.01) high in peripheral zone. Vertical distribution of stem density was linearly declined across zones(r2adj[ 0.70; P \ 0.01) with increase in the canopy height. Horizontal distribution of adult stems showed significant inverse quadratic relationship(r2adj[ 0.80; P \ 0.001), which suggests very low density of canopy forming voluminous trees in the interior zone.Immediate protection, restoration and management of interior regions are required to preserve local plant genetic diversity and also to maintain suitable habitat for threatened wildlife. | Koushik Majumdar Bal Krishan Choudhary Badal Kumar Datta | 2016 | Journal of Forestry Research2016，27，4： | 1 |
| 3 | Effects of anthropogenic disturbances on vegetation diversity and structure:a case study in the remnant forests surrounding the village ecosystems of Tripura,Northeast India显示文摘The types,frequency,and intensity of human interference with forests markedly affect the vegetation dynamics.Assessment of the impact of anthropogenic disturbances on forest diversity and structure is one of the central issues related to human behaviour and forest ecosystems and management.Both species diversity and density are very sensitive to local anthropogenic disturbance,which can be reduced depending on land-use systems.We used 10 line transects of 500 x 10 m to record and measure all plants >10 cm girth in some of the remaining forests surrounding villages in Tripura,Northeast India.To predict the effects of anthropogenic pressure on species richness and forest structure,we recorded and scored all ongoing disturbances in all transects of the forests.Although our study did not show any significant effects on the mean number of species,all diversity indices were significantly affected by disturbance.Total stem density(F = 128.60,p < 0.0001) and basal area(F = 65.30,p < 0.0001) of the forest stands were significantly affected by disturbance.Disturbance significantly(F= 84.81,p < 0.0001) impacts the abundance of mature voluminous trees removed by extensive illegal logging.Further,stem density at the middle(F= 10.01,p < 0.05) and upper(F= 131.70,p < 0.0001) canopy stories was also reduced by high disturbance intensity.The present analysis will be useful to policy-makers and planners for implementation of sustainable forest management at both the local and regional scale. | Koushik Majumdar B.K.Datta | 2015 | Chinese Journal of Population,Resources and Environment2015，13，4： | 1 |
| 4 | Effects of patch size, disturbances on diversity and structural traits of tropical semi-evergreen forest in the lowland Indo Burma hotspot: implication on conservation of the threatened tree species显示文摘Information on geographic distribution, population and threat status of most globally red listed species in the Indo Burma zone are inadequate. Given the increase in the prevalence of isolated forest patches in the part of this hotspot, evaluation is necessary on how size of the remnant forest patches and on-going disturbances affects structure and diversity of remaining habitats including the population of some globally threatened tree species. Quantitative vegetation inventory by 500 m long and 10 m wide(0.5 ha) line transects were randomly set in nine fragmented tropical semi-evergreen forest patches in Tripura, Northeast India. The studied forests patches grouped into small, medium and large based on their respected sizes. Spatial variability was analysed in woody species diversity and structure along the patch size gradients and their response to both patch size and anthropogenic disturbances. Out of 167 species, 13 identified as red-listed species by IUCN under the present inventory. Most of the diversity and structural parameters showed statistically significant positive response with the forest patch size, except for stand dominance, disturbance, sapling density and number of aggregated distribution pattern decreased when patch size increased. In addition, most of the diversity and structural attributes showed negative response with disturbances. Present baseline data would serve as an effective tool for management and protection of this important forest type. Future habitat restoration programme and strategies for relocation of additional population and re-introduction of those globally threatened trees are recommended. | Koushik MAJUMDAR Badal Kumar DATTA | 2016 | Journal of Mountain Science2016，13，8： | 0 |
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