天津农业科学2025，Vol.31Issue(9)：1-7,7.DOI:10.3969/j.issn.1006-6500.2025.09.001
不同土壤高温对梭梭幼苗生长与光合生理的影响
Effects of High Temperature in Different Soil Types on the Growth and Photosynthetic Physiology of Haloxylon ammodendron Seedlings
摘要
Abstract
To investigate the effects of different soil high temperatures on the growth and photosynthetic characteristics of Haloxylon ammodendron seedlings,a study was conducted using seedlings from the Gurbantünggüt Desert.A combination of pot experiments and laboratory analyses was employed to determine their high-temperature tolerance range.Treatments included root zone warming at 40℃,45℃,50℃,55℃,and 60 ℃.Growth and physiological parameters such as plant height,crown area,net photosynthetic rate(Pn),and stomatal conductance(Gs)were measured over 40 days.Results showed that seedling height and crown area initially increased and then decreased across temperature gradients,exhibiting significant stage-specific responses.Declines in these parameters after 10 days under 50-55℃ treatments were more pronounced than those below 45℃.Prolonged exposure(40 days)to temperatures above 50℃ significantly reduced Pn compared to 10 days treatments,with 55 ℃ and 60℃ treatments showing 83.06％and 85.46％reductions,respectively.After 40 days,intercellular CO2 concentration(Ci)under 50 ℃ and 55℃ treatments was 1.01 fold and 1.04 fold higher than at 45 ℃.The Ci under 50℃ treatment increased by 0.62-fold between 10 and 40 days.At 20 days,Gs at 45 ℃ was 1.16 fold and 1.05 fold higher than at 50℃ and 55 ℃,while transpiration rates(Tr)at 50℃ and 55℃ were 1.25 fold and 0.89 fold of that at 45℃.Both Gs and Tr under 50℃ treatment increased by 0.58 fold and 0.18-fold,respectively,from 10 to 20 days.Within the first 20 days,Pn consistently followed the order:45℃＞50℃＞55℃＞60℃.Short-term(10 days)high-temperature stress minimally af-fected seedling growth and physiology,but inhibitory effects intensified with prolonged exposure above 50 ℃.The study identified 50-55℃ as the critical high-temperature tolerance threshold for seedlings,providing theoretical foundations and technical parameters for artificial cultivation management of Haloxylon ammodendron forests in arid regions.关键词
梭梭幼苗/高温处理/生长/光合生理/耐受阈值Key words
Haloxylon ammodendron seedlings/high-temperature treatment/growth/photosynthetic physiology/tolerance threshold分类
农业科技引用本文复制引用
王上万,杨艳艳,王泽,杨杰,吴明哲,韦琴琴..不同土壤高温对梭梭幼苗生长与光合生理的影响[J].天津农业科学,2025,31(9):1-7,7.基金项目
国家自然科学基金项目(32260424,32160412) （32260424,32160412）
新疆维吾尔自治区级大学生创新训练计划项目(S202410758053) （S202410758053）
