柴达木盆地荒漠植物功能性状及其对环境因子的响应  

Functional traits of desert plants and their responses to environmental factors in Qaidam Basin,China

作　　者：霍佳璇 任梁 潘莹萍 赵瑾 向响 余程 孟德惠 王源源 鲁瑞洁 黄永梅 HUO Jiaxuan;REN Liang;PAN Yingping;ZHAO Jin;XIANG Xiang;YU Cheng;MENG Dehui;WANG Yuanyuan;LU Ruijie;HUANG Yongmei(State Key Laboratory of Earth Surface Processes and Resource Ecology,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学地理科学学部,地表过程与资源生态国家重点实验室,北京100875

出　　处：《生态学报》2022年第11期4494-4503,共10页Acta Ecologica Sinica

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0306);中国科学院战略性先导科技专项(XDA20100101)。

摘　　要：植物功能性状是植物适应环境的外在表达,反映了植物在不同环境中的生存策略,探究干旱区荒漠植物功能性状及其与环境之间的关系,有助于理解植物适应极端干旱环境的生态对策,为保护荒漠地区生态系统提供理论依据。以柴达木盆地为研究区,选取8个植物功能性状指标,包含4种植物生活型,10种荒漠植物,探究荒漠植物功能性状的基本特征及其对环境因子的响应。研究表明:柴达木盆地植物叶片碳含量(LCC)、叶片氮含量(LNC)、叶片磷含量(LPC)、叶片C∶N、叶片N∶P、叶片稳定碳同位素(Leafδ^(13)C)、叶片干物质含量(LDMC)和植株高度(Height)的变化范围分别为272.07-466.00mg/g、12.40-44.50mg/g、0.51-2.07mg/g、8.62-29.74、11.37-39.29、-27.38‰--14.80‰、100-480mg/g、3.00-264.22cm。不同生活型间LNC、LPC、叶片N∶P和LDMC差异不显著,LCC、叶片C∶N、叶片δ^(13)C和植株高度存在显著差异。LNC、LPC和叶片N∶P与全球、中国和青藏高原相比不存在显著差异,但与中国其他植被类型相比差异显著。冗余分析结果显示,气候因素中年均温对柴达木盆地荒漠植物功能性状的影响较大,植株高度、LDMC、LCC和叶片δ^(13)C随着年均温的升高而增加,土壤因子中砂粒含量和砾石含量对荒漠植物功能性状影响较大。研究结果揭示了气候和土壤物理性质对荒漠植物生存的重要性,表明柴达木盆地荒漠植物采取的生存适应策略为缓慢投资⁃收益型,不同生活型之间存在生态位分化,以适应不同干旱程度的生存环境。Plant functional traits can reflect the adaptation of plant species and their survival strategies to environment.Desert plants play an important role in maintaining the stability of desert ecosystems.Exploring the relationship between desert plant functional traits and their living environment is helpful to understand ecological strategies of plants to extreme drought,then provides a theoretical basis for the protection of desert ecosystem.However,there are many studies on vegetation and community dynamics in the Qaidam Basin,China,but there is still a lack of research on plant functional traits in this particular geographical area.Therefore,in this study,we toke the Qaidam Basin as the research area,selected 8 plant functional traits indexes,contained 10 desert plant species belong to 4 life forms,to explore the basic characteristics of plant functional traits and their relationship with environmental factors of desert plants from Qaidam Basin,China.Results showed that the value of leaf carbon content(LCC),leaf nitrogen content(LNC),leaf phosphorus content(LPC),leaf C∶N,leaf N∶P,leaf δ^(13)C,leaf dry matter content(LDMC),and plant height of desert plants from Qaidam Basin were 272.07-466.00 mg/g,12.40-44.50 mg/g,0.51-2.07 mg/g,8.62-29.74,11.37-39.29,-27.38‰--14.80‰,100-480 mg/g,3.00-264.22 cm,respectively.There were no significant differences in the LNC,LPC,leaf N∶P and LDMC among different life forms,but LCC,leaf C∶N,leaf δ^(13)C and plant height were significantly different.There were no significant differences between LNC,LPC,and leaf N∶P in the Qaidam Basin compared with the global,Chinese and Tibetan regions,but existed significant differences compared with other vegetation types in China.Redundancy analysis(RDA)results showed that mean annual temperature(MAT)of climatic factors had a great influence on the functional traits of desert plants in the Qaidam Basin,China.The plant height,LDMC,LCC and leaf δ^(13)C increased with the increase of MAT.With the increasing degree of drought in the cl

关 键 词：柴达木 荒漠植物 植物功能性状 环境因子 植物生活型 生存策略 

分 类 号：Q948[生物学—植物学]