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Niamjit Das , Swapan Kumar Sarker (2015). Tree Species Diversity and Productivity Relationship in the Central Region of Bangladesh. Journal of Forests, 2(2): 24-33. DOI: 10.18488/journal.101/2015.2.2/184.108.40.206
The diversity-productivity relationship has received considerable attention during the past two decades, largely because of the continuous loss of biodiversity. The positive relationship between species diversity and productivity is significant as a credible argument for the conservation of biodiversity. This research was conducted in the central region of Bangladesh to exemplify the relationship between tree species diversity and stand productivity at four mixed plantations. In total 112 sample plots (size - 0.09 ha/plot) of four different mixed species plantations were systematically selected for data collection. After that, regression analysis was explained significantly positive relationship between tree species diversity and productivity at four mixed plantations. This research suggests that having more tree species generally raises plantation productivity. Therefore, this result indicates that mixed species plantations could be the better choice in the degraded and fallow forest lands of Bangladesh.
This study is important in terms the positive relationship between species diversity and productivity should be used for restoring degraded tropical forests and the conservation of biodiversity.
Comparative Growth Analysis and Yield Performance of Glycine Max under Jatropha Curcas Based Agrisilviculture System of Agroforestry in the Northern Part of Bangladesh
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This research was conducted at the Agroforestry Research Farm, Hajee Mohammad Danesh Science and Technology University to quantify the effects of pruning height in Jatropha curcas L. (Jatropha) and fertility levels of the recommended dose of NPK in Glycine max L. (Soybean) on crop growth parameters and yield in the agrisilviculture system of Agroforestry. The pruning in Jatropha and fertility level favored growth parameters with varying magnitudes. Six growth indices like CGR, RGR, NAR, LAI, RLGR, and SLW were observed to be higher under various pruning heights and reduced under no pruning. After that, scale of yield varied with pruning heights and fertility levels. Grain, straw and biological yield of 100 cm pruning height in Jatropha increased by 15.38 %, 13.74 % and 14.61 % respectively in comparison to sole crop and other pruning height level. At that time, I showed that these three yields of 100 % of the recommended dose of NPK (100 % RDF) in Soybean are comparatively higher than other fertility level. Hence, proper pruning system and optimum fertility level are important for improving Soybean yield under Jatropha based agrisilviculture system and it ensures higher income to the farmers and efficient land management compared to its sole cropping.
This study is one of very few studies that are important for improving Soybean yield under Jatropha based agrisilviculture system than in sole cropping systems and it has the potential to develop the socioeconomic conditions of farmers.