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Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (35): 22-29.doi: 10.11924/j.issn.1000-6850.casb2021-0972

Special Issue: 生物技术 园艺 农业气象

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Evaluation of Introduced Garden Tree Species in the Alpine Suburban Areas

LI Zheng()   

  1. China Railway First Survey and Design Institute Group Co., Ltd., Xi’an, Shaanxi 710043
  • Received:2021-10-14 Revised:2021-12-26 Online:2022-12-15 Published:2022-12-09

Abstract:

To determine the adaptability of introduced garden tree species in the alpine suburban areas, in Huoshaogou of Xinning, a typical alpine region, the abilities of the introduced garden trees to resist freezing injury and maintain characteristic stability were studied by using field plant monitoring and indoor statistical analysis. The results showed that: (1) a slight frost crack at the base of the trunk of Padus virginiana ‘Canada Red’ in late winter and serious shoot shriveling and mild freezing injury of other arbor species in early spring were observed, the color or shape of their leaves changed significantly, and their adaptability value declined in the order of P. virginiana ‘Canada Red’ > A. negundo ‘Aurea’e > S. japonica ‘Golden Stem’ > U. pumila ‘Jinye’; (2) the shoot shriveling (branches, trunks) and frozen spots (buds, leaves, flowers) in the introduced small-arbor species were relatively serious, however, the percentage of flower discoloration or deformity were very low (<10%), and the order of the comprehensive value of adaptability was: Malus micromalus > Amygdalus triloba + davidiana = M. ‘Radiant’ > A. persica f. atropurpurea; (3) most of introduced Syringa species possessed very strong ability to resist freezing injury, whilst only part of annual branches of the four species showed a slight strip; whereas, some species had poor growth and development ability, for example, the Syringa pekinensis var. jinyuan did not develop flower organ, moreover, the order of their comprehensive adaptability was: S. oblatacv Luo-Lan-Zi = S. oblata ‘Buffon’ =S. villosa > S.wolfii>the other five species; (4) the branches or leaves of Euonymus kiautschovicu and Buxus sinica var. Parvifolia were freeze-dried in winter, and the other small shrubs also suffered different degrees of freezing injury and shoot shriveling, the adaptability of shrub species with spherical crown pattern was Prunus triloba var. plena = Spiraea thunbergii > U. pumila ‘Jinye’ > Sabina chinensisr, and the adaptability of the species used for hedgerow was Ligustrum obtusifolium = P.×cistenena ‘Pissardii’ > U. pumila ‘Jinye’. Based on the above results, it is concluded that shoot-shriveling of the introduced garden tree species in Alpine suburban areas is very serious, so some effective measures of preventing shoot shriveling should be taken at the early stage after transplanting.

Key words: alpine region, introduced garden tree species, shoot shriveling, freezing injury, adaptability

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