Effects of Nursery Substrate on the Early Growth of Michelia chapensis Plantations
Experimental plots were established within the Michelia chapensis young forest to screen the nursery substrate of M.chapensis seedlings and provide technical support for the future cultivation of high-quality afforestation seedlings.Growth data were collected and analyzed three times for two substrates of young forest,categorized by forest age(1 month,9 months,and 19 months,respectively),to compare the growth differ-ences between those cultivated in yellow mud substrate and nursery substrate after afforestation,as well as the variations among individuals of the same provenance during different growth stages.The results of variance anal-ysis showed that,for the two growth traits of tree height and ground diameter,the effect of seedling substrate reached an extremely significant difference level(P<0.001).In contrast,the provenance effect was not signif-icant,which indicated that most of the variation of young forest growth was due to the difference in the seedling substrate.The results of the T-test analysis of the growth differences of young seedlings with different substrates showed that within 1 month(t1),9 months(t2),and 19 months(t3),except for the tree height traits at the t1 growth stage,the tree height and ground diameter of young seedlings with nursery substrate were significantly higher than those of young seedlings with yellow mud substrate(P<0.05).The variation trend of tree height and ground diameter growth of three nursery substrate seedling afforestation pots was consistent,demonstrating a favorable growth trend.The analysis results confirm that compared with the traditional yellow mud substrate seedlings,the nursery substrate cultivation seedlings of M.chapensis have significant advantages and can be widely promoted and applied in forestry production.
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