调查了科尔沁沙地流动沙丘、半固定沙丘和固定沙丘18个样地的物种组成,测定了28种植物的叶面积(LA)、比叶面积(SLA)和叶干物质含量(LDMC)等3个植物功能性状,并用性状梯度分析法对3个功能性状在群落水平上的变化进行了分解,研究了沙丘固定过程中的植物功能性状的尺度变异及其与生境变化的关系。结果表明:(1)随着沙丘的固定,群落平均LA逐渐增大,群落平均SLA及LDMC在半固定沙丘上最小;(2)群落平均SLA的生态位宽度随着沙丘固定程度依次减小,流动、半固定沙丘植物群落的适应能力较固定沙丘更强;(3)沙丘固定过程中物种性状值的变化与群落内共生植物种性状间变异的关联相比于群落间性状的变异更密切。沙丘固定导致了物种LA与LDMC较强的正相关关系,两性状在群落间的依赖性比群落内的强。物种在群落内和群落间采取不同的策略来适应沙丘固定过程生境的变化。
This paper investigated species composition of 18 plots in mobile dune, semi-fixed dune and fixed dune, measured 3 kinds of plant functional traits-leaf area (LA), specific leaf area (SLA) and leaf dry matter content (LDMC) from 28 plant species. Then we analyzed the variations of 3 functional traits on the community level, decomposed the species' trait values by adopting the trait-gradient approach (TGA) and studied the correlations between plant functional traits and variations of habitats along the gradient of sand dune fixation. The results show that: (1) community mean leaf area tend to increase with the fixation of sand dune; community mean SLA and LDMC reach the minimum values on the semi-fixed dune. (2) The community niche breadth, calculated by community mean SLA, decreases along the sand dune stabilization gradient, which illustrates that mobile dune and semi-fixed dune plant communities have wider distribution than fixed dune's; (3) The variations of trait values of species are more relative to co-occurring species than the change of mean trait values of plots in which they occur. Following the stabilizing process of sand dune, LA and LDMC have relatively strong positive relationship, and the dependence of theses 2 traits among communities is stronger than that among symbiotic species. Within and among communities, species adopted different strategies to adapt to the change of habitats in the process of sand dune fixation.
[1] 孟婷婷,倪健,王国宏.植物功能性状与环境和生态系统功能[J].植物生态学报,2007,31(1):150-165.
[2] Violle C,Navas M,Vile D,et al.Let the concept of trait be functional[J].Oikos,2007,116:882-892.
[3] 刘金环,曾德慧,Lee D K.科尔沁沙地东南部地区主要植物叶片性状及其相互关系[J].生态学杂志,2006,25(8):921-925.
[4] Sch b C,Armas C,Guler M,et al.Variability in functional traits mediates plant interactions along stress gradients[J].Journal of Ecology,2013,101:753-762.
[5] Roche P,Díaz-Burlinson N,Gachet S.Congruency analysis of species ranking based on leaf traits:which traits are the more reliable?[J].Plant Ecology,2004,174:37-48.
[6] 尧婷婷,孟婷婷,倪健,等.新疆准噶尔荒漠植物叶片功能性状的进化和环境驱动机制初探[J].生物多样性,2010,18(2):201-211.
[7] Lavorel S.Plant functional effects on ecosystem services[J].Journal of Ecology,2013,101:4-8.
[8] Diaz S,Purvis A,Cornelissen J H C,et al.Functional traits,the phylogeny of function,and ecosystem service vulnerability[J].Ecology and Evolution,2013,3(9):2958-2975.
[9] Lauterbach D,R mermann C,Jeltsch F,et al.Factors driving plant rarity in dry grasslands on different spatial scales:a functional trait approach[J].Biodiversity Conservation,2013,22:2337-2352.
[10] 毛伟,李玉霖,张铜会,等.不同尺度生态学中植物叶性状研究概述[J].中国沙漠,2012,32(1):33-41.
[11] Lavorel S,Grigulis K.How fundamental plant functional trait relationships scale-up to trade-offs and synergies in ecosystem services[J].Journal of Ecology,2012,100(1):128-140.
[12] Pandey S K,Singh H.A simple,cost-effective method for leaf area estimation[J].Journal of Botany,2011,2011:1-6.
[13] 李玉霖,崔建垣,苏永中.不同沙丘生境主要植物比叶面积和叶干物质含量的比较[J].生态学报,2005,25(2):304-311.
[14] 李善家,苏培玺,张海娜,等.荒漠植物叶片水分和功能性状特征及其相互关系[J].植物生理学报,2013,49(2):153-160.
[15] 牛克昌,刘怿宁,沈泽昊,等.群落构建的中性理论和生态位理论[J].生物多样性,2009,17(6):579-593.
[16] Orwin K H,Buckland S M,Johnson D,et al.Linkages of plant traits to soil properties and the functioning of temperate grassland[J].Journal of Ecology,2010,98:1074-1083.
[17] Ackerly D D,Cornwell W K.A trait-based approach to community assembly:partitioning of species trait values into within-and among-community components[J].Ecology Letters,2007,10:135-145.
[18] 习新强,赵玉杰,刘玉国,等.黔中喀斯特山区植物功能性状的变异与关联[J].植物生态学报,2011,35(10):1000-1008.
[19] 赵哈林,周瑞莲,赵学勇,等.科尔沁沙地沙漠化正、逆过程的地面判别方法[J].中国沙漠,2008,28(1):8-15.
[20] 朱璧如,徐冰,张大勇.草地植物功能性状变异的程度和来源[J].北京师范大学学报:自然科学版,2011,47(5):485-489.
[21] 毛伟,李玉霖,赵学勇,等.3种藜科植物叶特性因子对土壤养分、水分及种群密度的响应[J].中国沙漠,2009,29(3):468-473.
[22] 陈林,杨新国,宋乃平,等.宁夏中部干旱带主要植物叶性状变异特征研究[J].草业学报,2014,23(1):41-49.
[23] Cornwell W K,Ackerly D D.Community assembly and shifts in plant trait distributions across an environmental gradient in coastal California[J].Ecological Monographs,2009,79:109-126.
[24] 张灵菲,魏斌,葛庆征,等.高寒草甸恢复演替过程中生产力与植物功能特征关系的研究[J].草业学报,2012,21(6):235-241.
[25] Laughlin D C.The intrinsic dimensionality of plant traits and its relevance to community assembly[J].Journal of Ecology,2014,102:186-193.