A change from phalanx to guerrilla growth form is an effective strategy to acclimate to sedimentation in a wetland sedge species Carex brevicuspis (Cyperaceae)
A change from phalanx to guerrilla growth form is an effective strategy to acclimate to sedimentation in a wetland sedge species Carex brevicuspis (Cyperaceae)
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从方阵生长形式到游击生长形式的变化是湿地莎草物种苔草（莎草科）适应沉积的有效策略
DOI：
10.1016/j.flora.2010.07.006
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发表时间：
2011-01-01
期刊：
影响因子：
1.9
通讯作者：
Hou, Zhi-Yong
中科院分区：
文献类型：
--
作者：
Chen, Xin-Sheng;Xie, Yong-Hong;Hou, Zhi-Yong
根茎型苔草短穗苔草（Carexbrevicuspis）可由缩短的根茎产生丛生分株（方阵），由伸长的根茎产生展布分株（游击），形成组合克隆生长型。本文研究了不同生境条件下，杉木无性系生长和生物量分配格局的变化。brevicuspis对沉降的反应。四个沉降深度（0，3，6，和9厘米）施加到48分株在一个随机区组设计。20周后收获植物。随着沉积深度的增加，扩展分株占总分株的比例从0 cm的19.6%增加到9 cm沉积处理的92.9%，而丛生分株占总分株的比例从80.4%下降到7.1%，表明沉积对克隆生长的影响由密集型向游击型转变。随着沉降深度的增加，生物量在地上部和根系中的分配没有变化，但根茎质量比从0 cm的2.7%增加到9 cm沉降处理的7.2%，表明长根茎的产生改变了生物量的分配格局。结果表明，在本实验条件下，克隆生长形式的可塑性是避免沉降胁迫的有效策略，通过克隆生长形式的可塑性产生更多的扩展分株。(C)2010年Elsevier GmbH。All rights reserved.
The rhizomatous sedge Carex brevicuspis can produce clumping ramets from shortened rhizomes (phalanx) and spreading ramets from elongated rhizomes (guerrilla) to form a combined clonal growth form. In this paper, changes in clonal growth and biomass allocation pattern of C. brevicuspis in response to sedimentation were studied. Four sedimentation depths (0, 3, 6, and 9 cm) were applied to 48 ramets in a randomized block design. Plants were harvested after 20 weeks. With increasing sedimentation depth, the proportion of spreading ramets to total ramets increased from 19.6% in 0 cm to 92.9% in 9 cm sedimentation treatments, whereas that of clumping ramets decreased from 80.4% to 7.1%, indicating a change of clonal growth form from phalanx to guerrilla as a response to sedimentation. With increasing sedimentation depth, biomass allocation to shoots and roots did not change, but rhizome mass ratio increased from 2.7% in 0 cm to 7.2% in 9 cm sedimentation treatments, suggesting that production of long rhizomes changes biomass allocation pattern. The results show that plasticity of clonal growth forms, by which more spreading ramets are produced, is an effective strategy to avoid sedimentation stress under our experimental conditions. (C) 2010 Elsevier GmbH. All rights reserved.