Page 174 - 《广西植物》2026年第2期
P. 174
3 6 8 广 西 植 物 46 卷
( 1. Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast ̄Growing Timber in Central South Chinaꎬ
Guangxi Key Laboratory of Forest Ecology and Conservationꎬ School of Forestryꎬ Guangxi Universityꎬ Nanning 530004ꎬ Chinaꎻ
2. Beihai Meteorological Bureauꎬ Beihai 536000ꎬ Guangxiꎬ Chinaꎻ 3. Open Laboratory of Beibu Gulf National
Climate Observatoryꎬ Beihai 536000ꎬ Guangxiꎬ Chinaꎻ 4. Hunan Botanical Gardenꎬ Changsha 410116ꎬ China )
Abstract: Exploring the growth and physiological adaptability of the offspring of Pinus yunnanensis var. tenuifolia (Pyt)
populations to high temperature and strong wind environment in their typical habitats is of great significance for
understanding the adaptive evolution and developmental potential of this species. Pyt is one of the main tree species in
the dry ̄hot valleys located at the junction of Yunnanꎬ Guizhouꎬ and Guangxi in the upper reaches of the Pearl River. It
is very important to maintain waterꎬ soilꎬ and vegetation ecology in this area. This study conducted seedling cultivation
experiments using natural populations of Pyt seeds collected from the Nanpanjiang ̄Hongshui River basinꎬ along with one
natural population of P. massoniana (Pm) from the adjacent eastern region. The 25 ℃ windless environment group was
used as the controlꎬ while the 30 ℃ windless environment group and the 25 ℃ environment with a wind speed of 1.2
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ms were established to investigate the adaptive responses of seedling growth and physiology to high temperature and
wind environment. The results were as follows: (1) Compared to Pmꎬ Pyt seedlings exhibited superior growth and
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physiological performance under a temperature of 30 ℃ and a wind speed of 1.2 ms . Additionallyꎬ the offspring of
certain Pyt populations performed significantly better than those of Pm. These findings demonstrate that Pyt possess
superior ecological suitability compared to Pm in dry ̄hot habitats. (2) The 30 ℃ environment significantly increased
ground diameter ( + 11.9%ꎬ P< 0.05) and total root average diameter ( + 9.41%ꎬ P< 0.05)ꎬ along with a marked
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reduction in peroxidase activity (-68.1%ꎬ P < 0.01) compared to 25 ℃ environment. A wind speed of 1.2 ms
significantly enhanced the total root average diameter ( +11.1%ꎬ P < 0.05) and decreased malondialdehyde content
(-44.9%ꎬ P < 0.05) compared to a windless environmentꎬ indicating that high temperature and windy environment
promote the growth of Pyt seedlings by enhancing the adaptation of their roots and stems to dry ̄hotꎬ and windy
envirommentꎬ thereby achieving a lower stress response. (3) Overallꎬ antioxidant enzyme activities and peroxidation
product contents showed negative correlations with annual mean temperatureꎬ monthly average temperatureꎬ and wind
speedꎬ while showed positive correlations with altitude and annual precipitationꎬ indicating that the physiological
adaptability of seedling growth was mainly influenced by the synergistic selections of temperatureꎬ precipitationꎬ windꎬ
and altitude. In conclusionꎬ the dry ̄hot environment combined with strong wind environment in the Nanpanjiang ̄
Hongshui River valley is a critical factor driving the development and evolution of Pyt.
Key words: ecological adaptabilityꎬ seedling growthꎬ resistance physiologyꎬ geographic environmentꎬ Pinus yunnanensis
var. tenuifolia
探究特殊生境下林木对其典型环境因子的适 Teskey et al.ꎬ 2015ꎻ 董燕平等ꎬ2023) 和生理性状
应性响应ꎬ对理解林木的适应性演化ꎬ乃至物种的 (Cruz et al.ꎬ 2019ꎻ招礼军等ꎬ2022ꎻ 李庆等ꎬ2023)
形成具有重要指导意义ꎮ 林木的生态适应性是指 来响应外界环境变化ꎮ 测定苗木生长指标ꎬ探究其
其在长期环境选择下ꎬ通过基因频率改变和遗传多 在不同环境下的生长表现ꎬ是评估林木对气候变化
样性调整ꎬ形成与环境相适应的表型和生理特征 适应潜力的重要方式(Varsamis et al.ꎬ 2019)ꎮ 对特
(贾翠蓉ꎬ2022)ꎮ 种子和苗木是林木种群持续繁衍 定环境下苗木生理生化指标的评估ꎬ可一定程度上
和发展的重要载体ꎬ一定程度上继承了亲本的生态 探究林木 对 特 殊 生 境 的 生 理 适 应 机 制ꎮ 丙 二 醛
适应特性ꎮ 因此ꎬ探讨苗木适应性与环境因子间的 ( malondialdehydeꎬ MDA ) 含 量ꎬ 过 氧 化 物 酶
关系有助于了解林木适应环境因子变化的可塑性 (peroxidaseꎬ POD)、 超 氧 化 物 歧 化 酶 ( superoxide
潜力(Boothꎬ 2019ꎻ da Silva et al.ꎬ 2022)ꎬ这对气候 dismutaseꎬ SOD)、过氧化氢酶(catalaseꎬ CAT)、多酚
变化背景下林木资源的保护至关重要ꎮ 氧化酶(polyphenol oxidaseꎬ PPO)等ꎬ是衡量植物抗
植物可通过一系列表型 ( Chen et al.ꎬ 2010ꎻ 逆响应的重要指标(韦秋梅等ꎬ2017)ꎮ 这些抗逆性

