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The study explored the growth regularity and genetic variation characteristics of Aquilaria sinensis Qi Nan clones to provide a theoretical basis for selection superior A. sinensis Qi Nan clones and application. 25 A. sinensis Qi Nan clones cultivated in the Experimental Center of Tropical Forestry of the Chinese Academy of Forestry were inves-tigated, the tree height and basal diameter were measured at 1, 2 and 3 years, respectively. The study analyzed early growth performance, adaptability, growth trait variations among different clones, and the intercorrelations. Comprehensive estimation of genetic parameters and cluster analysis were used to select superior clones. There were significant differences in tree height, basal diameter and preservation rate among the clones. The average tree height, basal diameter and preservation rate at 3 years old was 134.15 cm, 2.89 cm and 68.40%, respectively. The highest was Qi NYH, and the lowest was Bo LZ. There were substantial variations in the annual growth increments of tree height and basal diameter among the clones. Generally, the tree height and basal diameter increased remarkably in the third year. The clones showed different ranges of variation in tree height and basal diameter at different growth stages. The basal diameter showed a high degree of dispersion and the richest variation. The broad-sense heritability of growth traits in 3 years was high and stable, above 0.63. Basal diameter, tree height and preservation rate showed significant or extremely significant positive correlation. Principal component analysis revealed that the clones were comprehensively evaluated and ranked based on the scores. According to the selection rate of 20%, the top five were Qi NYH, Ao S, Jin SZ, Tu YW and Cuan T in turn. The results of cluster analysis showed that the clones were divided into 4 categories. Class Ⅰ grew better, and had stronger potential for growth in the later period than others, including Ao S, Qi NYH, Lan BS, Tu YW, Jin SY, Xi GY, Jin SZ and Cuan T, with the tree height, basal diameter and preservation rate above 158.00 cm, 3.00 cm and 73.00%, respectively. Class Ⅱ and Class Ⅲ grew relatively fast. Class Ⅳ grew the slowest with the slowest tree height, basal diameter and preservation rate. Through comprehensive evaluation, Qi NYH, Ao S, Jin SZ, Tu YW and Cuan T clones had the best performance in tree height, basal diameter and preservation rate. They could be popularized and planted as the excellent comprehensive quality of A. sinensis Qi Nan clones in Pingxiang and other suitable places.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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