Poplar (PoS group) ( Figure 5C ) showed a trend similar to that observed for pine for all MC levels, with −40°C and −70 to -80°C serving as turning points for the impedance measured at slow cooling rates.
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Experimental investigation of freeze injury temperatures in trees and their contributing factors based on electrical impedance spectroscopy.
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The ANOVA results revealed that subzero temperature, MC, and cooling rate exhibited highly significant effects on r e , r i , and τ of the sapwood tissues ( Table 1 ).