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21.
豫南引种檫木生长规律的研究 总被引:4,自引:0,他引:4
分析了不同立地条件下豫南引种擦木的年长规律。结果表明,擦木年生长过程中,树高有1个生长高峰,胸径有2个生长高峰,其生长状况、速生期及数量成熟龄随立地条件而异。 相似文献
22.
An
Application of Linear Model to Testing the Universal
Applicability of Site Index Curves for Chinese Fir Provenanc 下载免费PDF全文
The theory of statistical inferences for
linear model was employed to test the effect of Chinese fir provenances on site index
curves (dominant height growth curves).The results of analyzing two experimental farms,Hongya
and Jigongshan,showed that,(1)both site indices of different provenances in the
same region and those of the same provenances in different regions were both of
significant difference,which suggested that variation in site indices was a combination
of variation both in genetics and in environment.(2)The slope parameters of site index
curves for different provenances were of no significant difference,which meant that the
dominant heights of different provenances followed the same growth
development.Consequently the dominant height growths of different provenances could be
described by a similar growth model,which provided good evidence in support of the
universal applicability of Chinese fir growth and yield models. 相似文献