PJB-2022-87
Relative growth rate of tree seedlings in mixed coniferous forest of Swat Pakistan
Majid Ullah
Abstract
The relative growth rate (RGR) is a significant attribute of plant species strategies. The use of relative growth rate to plant size has provided a powerful tool for the analysis of growth efficiency and performance. Relative growth rate (RGR) of trees particularly slows down with the increase in size of a tree because a large allocation to structural materials of the trunk require holding photosynthetic material up in the canopy. To find out the relative growth rate this study was conducted in the mixed coniferous forest of swat Pakistan. Total hundred plots were selected at different ecological zones in which quadrates size 20x20 meter were selected. Growth rate, (RGR) per year and per month was measured. The highest growth rate was that of Cedrus deodara 29.27% per year. The highest relative growth rate (RGR) per year was that of Pinus roxburghii 1.41 g g−1 y−1.The RGR per month was also measured and the highest was that of Pinus roxburghii 0.118 g g−1 m−1.
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