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。
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.
作者
陈凯
杨艳
徐玲
赵永福
张宏玉
CHEN Kai;YANG Yan;XU Ling;ZHAO Yongfu;ZHANG Hongyu(School of Environment and Resources Sciences,Baoshan University,Baoshan 678000,China;Baoshan Comprehensive Inspection Center of Quality and Technical Supervision,Baoshan 678000,China)
出处
《生态科学》
CSCD
北大核心
2024年第1期88-93,共6页
Ecological Science
基金
国家自然科学地区基金项目(32160078)
国家自然科学地区基金项目(32060638)
云南省科技厅地方高校联合专项(202001BA070001-091)。
关键词
怒江干热河谷
木棉
种子大小变异
干热区
海拔
Nujiang Dry-hot Valley
Bombax ceiba
seed size variation
dry-hot region
elevation
