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Effects of uniconazole on the regulation of plant type in potted Prunus mume seedlings

LIU Wen-quan, LIN Xin-lian, SONG Yong-qiang, CHEN Rui-zhen, LI Yan-mei, LI Cui-ling

HUBEI AGRICULTURAL SCIENCES 2025, 64 (2): 99-103. DOI: 10.14088/j.cnki.issn0439-8114.2025.02.016

Abstract （79）

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The aim of this study was to investigate the effects of different concentrations of uniconazole on growth and plant type regulation of potted Prunus mume seedlings, and hence to cultivate more potted Prunus mume products with higher ornamental value. Six cultivars of potted Prunus mume seedlings were selected as the research objects, and three different concentrations of uniconazole were used for foliar spraying treatment, with water treatment as the control. The results were as follows, foliar spraying of 100~300 mg/L uniconazole decreased the growth of plant height and crown width of different cultivars of potted Prunus mume seedlings significantly, and the increase in the concentration of uniconazole could evidently enhance the inhibitory effect. Additionally, at the concentration of 300 mg/L of uniconazole, the growth of plant height and crown width of potted Prunus mume seedlings in six cultivars could be declined by 27.50%~80.05% and 39.45%~83.93%, respectively. Three different concentrations of uniconazole could improve the lateral bud germination in diverse potted Prunus mume seedlings, but inhibit the growth of basal diameter, branch stem thickness, branch length and internode length. Furthermore, the rise in the concentration of uniconazole could shorten the branch length and internode length. In summary, the study results suggest that from the perspective of the overall effect on regulating the plant type of potted Prunus mume seedlings, foliar spraying of 300 mg/L uniconazole was the optimal choice, which could make potted Prunus mume compact and full-crowned, with the best ornamental effect.

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Effects of tending management on species diversity of subforest communities of different types of Pinus massoniana in the Three Gorges Reservoir area： A case study of Zigui County

SHI Lei, WANG Xiao-rong, SHI Yu-hu, PANG Hong-dong, YANG Jia-wei, GU Zhong-chun, FEI Yong-jun

HUBEI AGRICULTURAL SCIENCES 2025, 64 (2): 104-111. DOI: 10.14088/j.cnki.issn0439-8114.2025.02.017

Abstract （69）

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To investigate the effects of different tree species composition configuration and nursery management on the species diversity of plant communities at various levels in the understory of Pinus Massoniana forests, four typical stand types, namely, nurtured P. massoniana + Cunninghamia lanceolata mixed forest （Ⅰ）, nurtured P. massoniana + Camellia oleifera mixed forest （Ⅱ）, unmanaged P. massoniana pure forest （Ⅲ） and unmanaged P. massoniana + C.lanceolata mixed forest （Ⅳ） were selected at Qinglinkou of Zigui County, to comparatively analyse the diversity of species in the shrub layer, herb layer and regeneration layer of P. massoniana forests of different types, as well as the relationship with stand factors. The results showed that, the number of species in the understorey of different types of P. massoniana forests was highest in the shrub layer, and the number of species in each layer of the understorey of the nurtured P. massoniana + Cunninghamia lanceolata mixed forest was the highest. The Margalef’s richness index （DM）, Shannon-Wiener’s diversity index （H）, Simpson’s dominance index （D） and Pielou’s evenness index （E） in the shrub layer of the nurtured P. massoniana + C. oleifera mixed forest were significantly lower than those of other stand types （P < 0.05）; the DM, H and D indices of the herbaceous layer of different types of P. massoniana forests were in the same order of change, with Ⅰ>Ⅳ>Ⅲ>Ⅱ. The DM and D indices of the nurtured P. massoniana + C. lanceolata mixed forest were significantly higher than those of other communities （P < 0.05）; and there was a significant difference in the E index of the regeneration layer among different types （P < 0.05）. Stand density was significantly negatively correlated with DM, H, D and E indices of the shrub layer （P<0.01）; average height below branches was significantly negatively correlated with DM, H, D and E indices of the regeneration layer（P<0.05）. Species composition, maintenance management, stand density and mean understory height all had significant effects on the species diversity of the understory community of Pinus massoniana. It is suggested that in the process of management of P. massoniana forest stands in the Three Gorges Reservoir Area, it was necessary to continuously optimise the structure of the forest stands, configure suitable mixed species, strengthen the nurturing management, and reasonably regulate the density of the forest stands, which was conducive to promoting the development of the positive succession of Pinus massoniana plantation forest stands.

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