Color Differences of Paulow nia Sp ecies in Different Growth Position
We measured five color parameters of brightness , red degree , yellow degree , general chromatism and whiteness in different growth position in six Paulownia species involving P.elongata from Gansu Province , P.tomentosa Steud from Hu-bei Province, P.fortunei from Hunan Province, P.elongata from Henan Province, P.catalpifolia andP .‘Yulin’ from Shandong Province .These parameters of top stem were optimal , and middle stem were better than bottom stem among the six species.The average brightness of top stem was 65.82, which was 1%higher than that of middle stem , and 3%higher than that of bottom stem .The average whiteness of top stem was 62.37, which was 1%higher than that of middle stem , and 3%higher than that of bottom stem .The general chromatism of top stem was minimum , and the red degree was the highest with moderate yellow degree .The difference between heart wood and sapwood was not significant in P.fortunei.The heart wood of P.elongata from Gansu Province was better than that of sapwood , while the sapwood of other four species were op-timal.The difference of five color parameters in different growth position reached significant level .
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