Tree species diversity and biomass carbon assessment in undisturbed and disturbed tropical forests of Dibru-Saikhowa biosphere reserve in Assam North-East India

Rajendra Kr. Joshi

摘要

In the present study, the tree species phytosociological attributes, tree density, basal area, and tree biomass carbon (above- and below-ground) distribution pattern was explored in the undisturbed and disturbed forest sites in Dibru-Saikhowa biosphere reserve of Assam, northeast India. The study area is globally recognized biodiversity hotspots in India and situated in the flood plain of the Brahmaputra and Lohit River. The tree species attributes like tree density, basal area, and tree biomass carbon were estimated in three undisturbed and disturbed forest sites. Principal component analysis, redundancy analysis, and correlation analyses were conducted to explore the relationship between biodiversity indices, forest stands characteristic, and treebiomass. The undisturbed forest stand showed the highest biological attributes (29-39 species and 25-33 genera) compare to disturbed forest stands (27-32 species and 21-27 genera). Combretaceae, Lauraceae, Phyllanthaceae, Salicaceae, Myrtaceae, and Moraceae has shown a higher importance value index. The biodiversity indices were significantly higher in undisturbed forest stands and the Shannon-Wiener diversity index (H') ranged from 1.97 to 3.57, Simpson index (Cd) ranged from 0.76 to 0.88, and evenness index (e) ranged from 0.65 to 0.97 in all the stands. The mean tree density and forest basal area were significantly higher in the undisturbed forest (796.66 ha~(-1) and 56.56 m~2 ha~(-1), respectively) compared to disturbed forest stands (436.66 ha~(-1) and 38.91 m~2 ha~(-1), respectively). Tree biomass carbon in undisturbed forest (184-214.62 Mg C ha~(-1)) was also more than disturbed forests (124-137.53 Mg C ha~(-1)). Moreover, the biomass carbon was greatly affected by the tree composition, diversity, density, and the disturbances in forest stands. The present study will provide the baseline information for effective and sustainable tree species diversity conservation and evaluate tree carbon stock in the Dibru-Saikhowa biosphere reserve.

机译：在目前的研究中,树种phytosociological属性,树密度,基底区,和树生物质碳(上图,探讨了地下)分布模式在不受干扰的森林站点和不安阿萨姆邦的Dibru-Saikhowa生物圈保护区,印度东北部。在印度认识到生物多样性热点地区位于雅鲁藏布江的冲积平原和Lohit河。树树密度、基底面积和生物量碳估计在三个原状和不安森林的网站。冗余分析和相关性分析进行探索的关系生物多样性指数、森林站之间特点,treebiomass。林分显示最高的生物属性(29-39物种和男性属)比较干扰森林站(新物种和21-27生成)。Phyllanthaceae,杨柳科、桃金娘科和桑科显示更高的重要性索引。明显高于安静的森林里和Shannon-Wiener多样性指数(H)范围从1.97到3.57,辛普森指数(Cd)范围从0.76到0.88,均匀度指数(e)范围从0.65到0.97在所有。意味着树森林密度和基底面积显著的高于安静的森林(796。66公顷~(- 1)和56。56米~ 2公顷~ (- 1),)相比,干扰林地(436 . 66公顷~(- 1)和38 . 91米~ 2公顷~ (- 1),分别)。森林(184 - 214.62毫克C哈~(1))也更多比被破坏的森林(124 - 137.53毫克C哈~(1))。此外,生物质碳大大受到影响树的组成、多样性、密度和森林的干扰。研究将提供基线资料有效和可持续的树种多样性保护树和评估碳的股票Dibru-Saikhowa生物圈保护区。

Tree species diversity and biomass carbon assessment in undisturbed and disturbed tropical forests of Dibru-Saikhowa biosphere reserve in Assam North-East India

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