摘要
【目的】揭示民勤地区沙拐枣叶功能性状在不同生境的变异规律,探明沙拐枣对干旱荒漠环境的适应策略。【方法】以民勤绿洲-荒漠过渡带沙拐枣(Calligonum mongolicum)为对象,采用样方法采集样株东西南北4个方向中部生长良好的叶片,用土钻采集植株根系附近深度为0—60 cm的土壤样本,比较分析丘间低地与流动沙丘2种生境下沙拐枣叶功能性状特征及相关性,揭示沙拐枣叶功能性状与土壤因子的关系。【结果】(1)沙拐枣叶功能性状的变异系数介于2.39%~24.94%,比叶面积(SLA)变异系数最大(24.94%),稳定碳同位素(δ^(13)C)变异系数最小(2.39%);沙拐枣叶片的全碳(LCC)、全磷(LPC)含量在样地之间存在显著差异,而SLA、LPC在2种生境间存在显著差异。(2)在丘间低地与流动沙丘2种生境下沙拐枣叶片含水量(LWC)与干物质含量(LDMC)分别呈极显著、显著负相关关系,LWC是2种生境下沙拐枣叶功能性状中综合排名前3的共同指标因子。(3)全氮(STN)、pH值和土壤含水量(SMC)是影响民勤沙拐枣叶功能性状变异的主要土壤因子。【结论】沙拐枣通过改变叶片形态和调节营养物质含量,以及与土壤因子的相互作用,以更好适应生境。
[Objective]This study aims to reveal the variation patterns of leaf functional traits of Calligonum mongolicum in different habitats in Minqin,Gansu Province,China,and to explore the adaptation strategies of C.mongolicum to the arid desert environment.[Methods]This study took C.mongolicum in the oasis-desert transitional zone as the object,and using sampling methods to collect well growing leaves from the central part of the sample plants in four directions:east,west,north,and south.Soil samples in the depth of 0-60 cm near the roots of plants were collected using a soil drill.The leaf functional traits and correlation of C.mongolicum under two habitats,interdune lowland and active sand dune,were analyzed.The relationship between leaf functional traits and soil factors were analyzed.[Results](1)the variable coefficient of leaf functional traits was between 2.39% and 24.94%,where specific leaf area(SLA)was the largest(24.94%)while the stable carbon isotope(δ^(13)C)was the smallest(2.39%).There was significant difference in total carbon content(LCC)and total phosphorus content(LPC)of C.mongolicum leaves between the two sites,while there were significant differences in SLA and LPC between the two habitats.(2)The leaf water content(LWC)and leaf dry material content(LDMC)were extremely significantly(P<0.01)and significantly(P<0.05)negatively correlated under the two habitats conditions,respectively.LWC was the top three common index factor in the comprehensive ranking of leaf functional traits of C.mongolicum under the two habitats conditions.(3)Soil total nitrogen content(STN),pH value,and soil moisture content(SMC)were the main soil factors affecting the variation of leaf functional traits.[Conclusion]C.mongolicum could better adapt to the habitat by changing leaf morphology,regulating nutrient content,and interacting with soil factors.
作者
王飞
陈文业
郭树江
杨帆
王强强
杨自辉
WANG Fei;CHEN Wenye;GUO Shujiang;YANG Fan;WANG Qiangqiang;YANG Zihui(Gansu Desert Control Resesrch Institiute,Lanzhou 730070,China;Gansu Research Academy of Forestry Science and Technology,Lanzhou 730020,China;Gansu Minqin National Studies Station for Desert Steppe Ecosystem,Minqin,Gansu 733300,China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2024年第1期77-87,共11页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家地区基金项目(31960334)
国家青年科学基金项目(31700339)
中国科学院——西部之光青年学者项目。
关键词
沙拐枣
叶功能性状
生境
土壤因子
民勤
Calligonum mongolicum
leaf functional traits
habitat
soil factor
Minqin
