植物生态学报 ›› 2008, Vol. 32 ›› Issue (3): 611-621.DOI: 10.3773/j.issn.1005-264x.2008.03.010
万宏伟1, 杨阳1, 白世勤2, 徐云虎3, 白永飞1,*()
收稿日期:
2007-07-17
接受日期:
2007-12-26
出版日期:
2008-07-17
发布日期:
2008-05-30
通讯作者:
白永飞
作者简介:
*E-mail:yfbai@ibcas.ac.cn基金资助:
WAN Hong-Wei1, YANG Yang1, BAI Shi-Qin2, XU Yun-Hu3, BAI Yong-Fei1,*()
Received:
2007-07-17
Accepted:
2007-12-26
Online:
2008-07-17
Published:
2008-05-30
Contact:
BAI Yong-Fei
摘要:
该文比较了羊草草原群落中包括建群种和优势种在内的6种植物,羊草(Leymus chinensis)、西伯利亚羽茅(Achnatherum sibiricum)、大针茅(Stipa grandis)、冰草(Agropyron cristatum)、糙隐子草(Cleistogenes squarrosa)和黄囊苔草(Carex korshinskyi)的比叶面积(Specific leaf area, SLA)、叶片含氮量和叶绿素含量等叶片功能特性(Leaf functional trait)对氮素添加的响应,旨在探讨草原生态系统中,不同物种对氮素可利用性改变的响应和适应对策。结果表明:随着氮素添加量的增加,物种对光资源的竞争增强,不同物种在光资源的竞争策略和竞争力间存在着显著的差异。羊草通过提高SLA、单位质量叶片的叶绿素含量和含氮量,使单位面积叶片含氮量和叶绿素含量均呈线性提高,进而增强了其对光的竞争力。西伯利亚羽茅主要通过提高SLA增加光合总面积,来增强自身的光竞争力。冰草在SLA和单位质量叶片的叶绿素和氮含量均有一定的可塑性,但对光的竞争力明显弱于羊草和西伯利亚羽茅。大针茅和黄囊苔草对SLA的调节能力较低,加之大针茅SLA较低,而黄囊苔草处于群落的下层,这两种植物的光竞争力较弱。糙隐子草具有较高的SLA,对单位质量叶片叶绿素和氮含量的调节能力相对较强,其光竞争力高于黄囊苔草。同时,糙隐子草叶片叶绿素a与叶绿素b的比值沿氮素添加梯度显著降低,进一步证实氮素添加改变了群落的光环境。
万宏伟, 杨阳, 白世勤, 徐云虎, 白永飞. 羊草草原群落6种植物叶片功能特性对氮素添加的响应. 植物生态学报, 2008, 32(3): 611-621. DOI: 10.3773/j.issn.1005-264x.2008.03.010
WAN Hong-Wei, YANG Yang, BAI Shi-Qin, XU Yun-Hu, BAI Yong-Fei. VARIATIONS IN LEAF FUNCTIONAL TRAITS OF SIX SPECIES ALONG A NITROGEN ADDITION GRADIENT IN LEYMUS CHINENSIS STEPPE IN INNER MONGOLIA. Chinese Journal of Plant Ecology, 2008, 32(3): 611-621. DOI: 10.3773/j.issn.1005-264x.2008.03.010
图1 羊草、西伯利亚羽茅、冰草、大针茅、黄囊苔草和糙隐子草比叶面积(SLA)与氮素添加梯度关系 n.s.表示相关关系不显著
Fig.1 Relationship between specific leaf area (SLA) and nitrogen addition rate of Leymus chinensis (L.c.), Achnatherum sibiricum (A.s.), Agropyron cristatum (A.c.), Stipa grandis (S.g.), Carex korshinskyi (C.k.), and Cleistogenes squarrosa (C.s.) n.s. denotes no significance
图2 6种植物叶片单位质量含氮量(Nmass)与氮素添加梯度的关系
Fig.2 Relationship between mass-based leaf nitrogen content (Nmass) and nitrogen addition rate of the six plant species Abbreviations are the same as Fig. 1
图3 6种植物叶片单位面积含氮量(Narea)与氮素添加梯度的关系
Fig.3 Relationship between area-based leaf nitrogen content (Narea) and nitrogen addition rate of the six species All abbreviations are the same as Fig. 1
图4 6种植物叶片单位质量叶绿素含量(Cmass)与氮素添加梯度的关系
Fig.4 Relationship between mass-based leaf chlorophyll content (Cmass) and nitrogen addition rate of the six species All abbreviations are the same as Fig. 1
图5 6种植物叶片单位面积叶绿素含量(Carea)氮素添加梯度的关系
Fig.5 Relationship between area-based leaf chlorophyll content (Carea) and nitrogen addition rate of the six species All abbreviations are the same as Fig. 1
图6 6种植物叶绿素a、b比值(Ca∶Cb)对氮素添加梯度的响应 误差线表示均值的标准误(SE);不同字母表示在p<0.05下差异显著
Fig.6 Responses of chlorophyll a/b ratio (Ca∶Cb) of the six species along a nitrogen addition gradient Error bars denote the standard error of means (SEM). Bars with different letters above them represent significantly different in Duncan's multiple range tests (p<0.05). All abbreviations are the same asFig. 1
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