摘要
研究了不同干旱程度对白枪杆幼苗叶片形态及生理的影响,探究了白枪杆幼苗对石漠化地区干旱环境的适应规律。以1年生白枪杆实生苗为材料,采用单因素随机区组试验设计,设置4个干旱处理[正常水平(CK)、轻度干旱(LD)、中度干旱(MD)和重度干旱(SD)],测定白枪杆幼苗叶片性状、叶绿素含量、保护酶活性的变化规律。结果表明:①随着干旱胁迫程度的加剧,白枪杆幼苗叶片在轻度干旱(LD)处理下叶片生长状况最佳,叶片性状最优;②叶片Chla、Chlb、Chl(a+b)呈先增加后下降的趋势,轻度干旱处理下达到峰值;Chl(a/b)在轻、中度干旱下保持稳定,重度干旱下显著降低;③随干旱程度加剧,叶片SOD、POD、CAT保护酶活性呈先增大后减少的趋势,均在轻度干旱(LD)处理下达到峰值。主成分分析结果表明轻度干旱(LD)处理下,白枪杆幼苗趋向“快速投资”策略,具有较高的Chla、Chlb、Chl(a+b)和SOD。相关性分析结果显示,经干旱处理后白枪杆幼苗叶片Chla、Chlb与SOD呈显著正相关。白枪杆幼苗对持水量50%~70%的轻度干旱土壤有一定适应能力,可通过叶片性状及生理调节抵御干旱。研究可为石漠化地区植被恢复、树种速生育苗提供参考。
This paper studies the effects of different drought levels on the leaf morphology and physiology of Fraxinus malacophylla seedlings,investigates the adaptation pattern of Fraxinus malacophylla seedlings to the drought environment in stone desertification areas,and provides a reference for vegetation restoration and rapid growth of tree species in stone desertification areas.One-year old Fraxinus malacophylla live seedlings were used as the material,and four drought treatments(normal level(CK),mild drought(LD),moderate drought(MD)and severe drought(SD))were set up in a single-factor randomized group experimental design to determine the changes of leaf traits,chlorophyll content and protective enzyme activities of Fraxinus malacophylla seedlings.Result:①with the intensification of drought stress,the best leaf growth and the best leaf traits were observed in Fraxinus malacophylla seedlings under light drought(LD)treatment;②leaf Chla,Chlb,and Chl(a+b)showed a trend of increasing and then decreasing,reaching a peak under light drought treatment;Chl(a/b)remained stable under light and moderate drought and decreased significantly under severe drought;③the activities of SOD,POD,and CAT protected enzymes showed a trend of increasing and then decreasing with the increase of drought,and all of them reached the peak under light drought(LD)treatment.The results of the principal component analysis showed that Fraxinus malacophylla seedlings tended to have higher Chla,Chlb,Chl(a+b),and SOD under light drought(LD)treatment,and the correlation analysis showed that Chla,Chlb,and SOD were significantly and positively correlated after drought treatment.Fraxinus malacophylla seedlings are adaptable to mildly drought-prone soils holding 50%-70%water and can resist drought through leaf traits and physiological regulation.
作者
王元友
茶晓飞
董琼
Wang Yuanyou;Cha Xiaofei;Dong Qiong(Forestry College of Southwest Forestry University,Kunming 650224,Yunnan,China;Key Laboratory of Forest Resources Conservation and Utilization in Southwest Mountainous Area,Ministry of Education,Kunming 650224,Yunnan,China;Nujiang Forestry and Grassland Bureau,Nujiang 671499,Yunnan,China)
出处
《绿色科技》
2025年第9期73-78,共6页
Journal of Green Science and Technology
基金
云南省教育厅科学研究基金项目(编号:2021J0166)。
关键词
白枪杆
干旱胁迫
叶片性状
保护酶活性
Fraxinus malacophylla
drought stress
leaf traits
protective enzymes activity
作者简介
第一作者:王元友(1997-),男,硕士研究生,研究方向为植被恢复与保持;通讯作者:董琼(1973-),男,博士,副教授,研究方向为植被恢复和经济林栽培。
