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《Guihaia》 2010-05
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Phenotypic plasticity and modular biomass of invasive Parthenium hysterophorus in different habitats in south China

PU Gao-Zhong1,TANG Sai-Chun1,PAN Yu-Mei1,WEI Chun-Qiang1,CEN Yan-Xi1,2( 1.Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences,Guilin 541006,China; 2.College of Life Science,Guangxi Normal University,Guilin 541004,China )  
Parthenium hysterophorus is a worldwide weed. In this paper,we compared the phenotypic plasticity and modular biomass among microhabitat types(farmland,grassland,forest edge and roadside),in a village community alone a road in the autumn of 2008,to answer the two specific questions that:1)phenotypic plasticity may have played a key role in adaption to diverse habitats of P.hysterophorus;and 2)reproductive allocation must have adjusted to adaption diverse habitats. The results indicate that several morphological traits including stem length,stem diameter,inflorescence diameter and branch number of P.hysterophorus were significantly higher in farmland than others,and the proportion of biomass including flower and fruit,stem in farmland habitat have ranked the highest. With vary of the habitats soil fertility,plant density of P.hysterophorus decreased,all the morphological traits have showed a wide range. And biomass allocation proportion of function modules of P.hysterophorus have also made an optimized allocation to fit the varied habitats,for example,biomass of root and leaf related to light foraging and resource competed creased significantly from farmland and roadside to grassland and especially forest edge habitats. Correlation analysis indicated that there were significant positive correlations between the biomass of function modules and stem length,but significant negative correlations between the biomass of function modules and density. The results suggest that high plasticity and strong reproduction allocation in vertical growth may facilitate the invasions of P.hysterophorus.
【Fund】: 广西自然科学基金(0728077);; 国家自然科学基金(30870386)~~
【CateGory Index】: Q948.13
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