%0 Journal Article
%T PHENOTYPIC PLASTICITY OF THE CLONAL PLANT TRAPA BICORNIS IN RESPONSE TO SEDIMENT PHOSPHORUS CONCENTRATION AND PLANT DENSITY<br>克隆植物乌菱对底泥磷含量及植株密度的表型可塑性响应
%A CAI Ying
%A GUAN Bao-Hua
%A AN Shu-Qing
%A SHEN Rui-Ling
%A JIANG Jin-Hui
%A DONG Lei
%A <br>蔡颖
%A 关保华
%A 安树青
%A 申瑞玲
%A 蒋金辉
%A 董蕾
%J 植物生态学报
%D 2007
%I Editorial Office of Chinese Journal of Plant Ecology
%X Aims Trapa bicornis is a clonal floating macrophyte that dominates several lakes in China. Due to eutrophication, the distribution of T. bicornis is shrinking, and T. bicornis has disappeared in some lakes. Our objectives were to investigate the effects of sediment phosphorus concentration (SP), plant density (PD) and their interaction on the plasticity of T. bicornis and examine whether plasticity could promote ecological adaptation in eutrophic environments. Methods In a controlled factorial experiment, we grew artificial populations of T. bicornis in low, medium and high PD (4, 8 and 12 individuals per container, respectively) under low, medium and high SP. We harvested all plants after six weeks and measured the dry mass for each plant part. Important findings SP significantly affected leaf, stem, green root, anchoring root and total plant phosphorus concentrations as well as number of main rosettes of trullate floating leaves, special green root length and special anchoring root length of T. bicornis, but PD did not significantly affect any growth or ecophysiological traits. With increasing SP, plant phosphorus concentration increased. Number of main rosettes of trullate floating leaves of T. bicornis was the largest at low SP and low PD, leaf mass ratio at medium SP and high PD, special green root length at high SP and medium PD, and special anchoring root length at high SP and high PD. SP, PD and their interaction altered some of the allometric relationships between leaf, stem, green root, anchoring root and total biomass. Morphological and ecophysiological traits mostly affected by SP and high PD may increase the ecological adaptability of T. bicornis under eutrophic conditions caused mainly by phosphorus.
%K phenotypic plasticity
%K sediment P concentration
%K plant density
%K Trapa bicornis
%K clonal plants
%K ecological adaptability<br>表型可塑性
%K 底泥磷含量
%K 植株密度
%K 乌菱
%K 克隆植物
%K 生态适应性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=CB3B05292E4558DA&yid=A732AF04DDA03BB3&vid=4AD960B5AD2D111A&iid=E158A972A605785F&sid=4158386E7B9422C8&eid=6EEC242D0D8BE428&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=0&reference_num=48