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The effect of wind speed on tree breakage: 13m/s (A), 15m/s (B), 18m/s (C), respectively. Result is shown under calm conditions. The remaining trunk biomass is 170.78, 159.85 and 120.58 kg, respectively. The circles indicate the points where the trunk breakage takes place. The plant age is 8, S layer = 6, λ = 0.1.
