荒漠绿洲过渡带沙丘不同固定阶段植物群落叶功能性状特征  

Characterization of leaf functional traits in plant communities at different stages of fixation in sand dunes in the transition zone of desert oases

作　　者：范卓鹏 解婷婷 单立山[1] 马静 王红永 李瑞[1] FAN Zhuopeng;XIE Tingting;SHAN Lishan;MA Jing;WANG Hongyong;LI Rui(College of Forestry,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学林学院,兰州730070

出　　处：《生态学报》2025年第7期3370-3388,共19页Acta Ecologica Sinica

基　　金：甘肃农业大学青年导师扶持基金(GAU-QDFC-2022-08);国家自然科学基金(U23A2061,32160253);甘肃省科技重大专项计划(22ZD6FA052)。

摘　　要：叶功能性状在反映植物群落获取资源和适应环境中起着至关重要的作用。基于局域尺度下植物群落功能性状的研究,对于理解和预测该地区植物群落对生境变化的物种组合及适应策略具有重要意义。由于荒漠绿洲过渡带(局域尺度)环境异质性显著,不同环境下的群落优势种与群落组成存在差异,进而导致植物群落的功能性状发生变化。然而,荒漠植物群落功能性状沿环境梯度分布特征及与土壤因子间的相互关系尚不明确。以临泽荒漠绿洲过渡带沙丘不同固定阶段的植物群落为研究对象,进行群落调查和叶功能性状的测定,并采用性状梯度分析法对植物群落水平下的叶功能性状进行分解,研究了荒漠绿洲过渡带生境异质性对叶功能性状的影响。结果表明:(1)叶功能性状中肉质化程度、叶片含水量、相对含水量、饱和含水量、叶干物质含量、比叶面积、组织密度、叶片磷含量和叶氮磷比在异质生境(沙丘不同固定阶段)差异显著,以灌木和多年生草本为主的固定沙丘植物倾向于采用“慢速偿还”策略,以一年生草本为主的半固定沙丘和固定沙丘的植物倾向于采用“快速偿还”策略,随沙丘的固定植物更易由受P限制转向受N限制。(2)植物群落的组织密度、叶碳磷比和叶氮磷比的可塑性和变异性最高,土壤紧实度、土壤磷含量和土壤含水量是引起变异的主要驱动因子。(3)叶功能性状梯度参数α值范围大于β值,表明对于群落构建来讲,生物竞争作用大于环境过滤;比叶面积和叶干物质含量间β组分具有较强的负相关关系,而α组分无相关性,表明物种在群落内和群落间采取不同的生态策略来适应环境。(4)不同生境影响植物群落功能性状的主要制约因素不尽相同,随生境条件变的更不稳定,与性状间联系更加紧密。综上,沙丘不同固定阶段的植物群落通过叶功能性状表现�Leaf functional traits are pivotal for reflecting how plant communities access resources and adapt to their environment.Studies on plant functional traits based at the local⁃scale plant communities level is important for understanding and predicting species assemblages and adaptation strategies of plant communities in response to regional habitat changes.Due to the significant environmental heterogeneity at the local scale in the desert⁃oasis transition zone,differences in community⁃establishing species and community composition across different environments lead to variations in plant community functional traits.However,the distribution characteristics of desert plant community functional traits along environmental gradients and the interplay with soil factors remain unclear.In this study,we investigated the effects of habitat heterogeneity on leaf functional traits in the transition zone of desert oasis in Linze with different stages of fixation in the sand dunes,conducted community surveys and measurements of leaf functional traits,and decomposed plant community⁃level leaf functional traits using trait gradient analysis.The results showed that:(1)Leaf functional traits such as degree of fleshing,leaf total water content,relative water content,saturat water content,leaf dry matter content,specific leaf area,tissue density,leaf phosphorus content,and leaf nitrogen to phosphorus ratio varied significantly in heterogeneous habitats(different stages of dune fixation),and plants in fixed dunes dominated by shrubs and perennials tended to adopt a“slow repayment”strategy.Plants in fixed dunes dominated by shrubs and perennials tended to adopt a“slow payback”strategy,while plants in semi⁃fixed and fixed dunes dominated by annuals tended to adopt a“fast payback”strategy,and plants in stabilized dunes were more likely to transition from P⁃to N⁃limitation.(2)Tissue density,leaf carbon to phosphorus ratio,and leaf nitrogen to phosphorus ratio had the highest plasticity and variability,and soil com

关 键 词：植物群落 叶功能性状 性状梯度分析法 荒漠绿洲过渡带 生境异质性 荒漠植物 

分 类 号：Q948[生物学—植物学]