怒江干热河谷木棉种子大小的变异格局
Variation patterns of Bombax ceiba seed size in Nujiang Dry-hot Valley
陈凯 1杨艳 2徐玲 1赵永福 1张宏玉1
作者信息
- 1. 保山学院资源环境学院, 保山 678000
- 2. 保山市质量技术监督综合检测中心, 保山 678000
- 折叠
摘要
为揭示怒江干热河谷木棉种子大小的变异格局,在该气候区的不同生境采集木棉种子,测定种子生物量、直径用于量化种子大小,并借助回归模型分析种子大小随环境梯度的变化.结果显示:(1)在怒江干热河谷,木棉种子大小呈正态分布;(2)在不同干热区,种子大小依次为轻度干热区﹥中度干热区﹥重度干热区;(3)木棉种子随海拔升高而呈变小的趋势;(4)木棉种子大小的变异性随海拔(或干旱强度)上升不断减小.结论表明,木棉种子大小受到水热条件的选择压力,在稳定的水热环境中木棉种子更大,其大小的变异性也更高.
Abstract
In order to reveal the variation patterns of Bombax ceiba(Bombacaceae)seed size in Nujiang Dry-hot Valley,Bombax ceiba seeds were collected from different habitats of Nujiang Dry-hot Valley.Then seed biomass and diameter were measured to quantify seed size.The regression models were used to analyze seed size variations along environmental gradients in Nujiang Dry-hot Valley.The results are as follows.(1)Bombax ceiba seed size(including mass and diameter)showed normal distributions in Nujiang Dry-hot Valley.(2)Seed size had significant differences among three different dry-hot regions,with values of mild dry-hot region>moderate dry-hot region>severe dry-hot region.(3)Seed size decreased with increasing elevation.(4)Seed size variability also decreased with increasing elevation and drought intensity.These results suggest that Bombax ceiba seeds are under hydrothermal selective pressures,and populations of Bombax ceiba distributed in stable hydrothermal habits produce larger seeds and also have higher seed size variability.
关键词
怒江干热河谷/木棉/种子大小变异/干热区/海拔Key words
Nujiang Dry-hot Valley/Bombax ceiba/seed size variation/dry-hot region/elevation引用本文复制引用
基金项目
国家自然科学基金地区科学基金(32160078)
云南省科技厅地方高校联合专项(202001BA070001-091)
国家自然科学基金地区科学基金(32060638)
出版年
2024
国家科技期刊平台
NSTL
万方数据