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郭传超; 周伟权; 石荡; 蒋南林; 唐莹莹; 刁永强; 刘立强
生态学报, 2023, Volume: 43, Issue: 2Journal Article
新疆野杏(Prunus armeniaca Lam.)是天山野果林的优势种,具有重要的生态与资源价值.野果林的生境条件与其分布及生长密切相关.为了明确新疆野杏在不同海拔下的开花物候与花器官变化规律,于2021年3月—4月,选择新疆新源县吐尔根杏花沟野杏林为研究区,在野杏集中分布的1000—1500m的山地,由低到高划分Ⅰ—Ⅴ级海拔梯度设置样地,监测环境条件,对野杏群体开花物候期与花器官发育特征进行调查.结果表明:(1)新疆野杏群体开花物候期历时32d左右,各海拔梯度最长相差2d,第Ⅰ级与第Ⅱ级海拔的开花物候期差异不明显,其他海拔梯度间均存在显著差异,开花最晚的第Ⅴ级比最早的第Ⅰ级晚9d,但群体开花期长4d,海拔梯度与开花物候期呈显著正相关,而温度与开花物候期呈显著负相关;(2)新疆野杏的花萼长度和宽度、子房高度和宽度均是第Ⅱ级海拔的最大;花冠直径、花瓣纵径和横径均是第Ⅰ级的最大,花药长度和宽度均是第Ⅳ级的最大;花柱长度是第Ⅴ级的最大.海拔与花的外部器官、雌蕊呈显著负相关,与雄蕊呈显著正相关;光照强度与花的外部器官、雌蕊呈显著负相关;(3)新疆野杏开花期气候因子,第Ⅳ级、第Ⅴ级与第Ⅰ级存在显著差异,海拔梯度与湿度、光照强度呈显著正相关,与温度呈显著负相关.新疆野杏群体开花物候期历时约32d,随海拔升高,野杏林地光照强度增强,温度降低,湿度增大;野杏开花物候期推迟,开花期历时增长,每升高100m,开花期推迟约1.8d;野杏花雄蕊发育逐渐增大,雌蕊和花的外部器官发育逐渐减小,是新疆野杏对海拔变化的适应性.研究结果可以为野杏种群分布适应性研究提供理论依据.
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