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《Acta Agrestia Sinica》 2011-03
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Vegetative Propagation and Reproductive Growth of Two Ecotypes Leymus chinensis L. in Songnen Plain

ZHOU Chan1,ZHANG Zhuo2,LV Yong-tong1,YANG Yun-fei3* (1.College of Life Science,Liaoning University,Shenyang,Liaoning Province 110036,China;2.College of Biology and Environment Engineering,Shenyang University,Shenyang,Liaoning Province 110044,China;3.Institute of Grassland Science,Northeast Normal University,Key Laboratory for Vegetation Ecology,Ministry of Education,Changchun,Jilin Province 130024,China)  
Systems of both vegetative propagation and characteristics of sexual reproduction in two ecotypes Leymus chinensis were studied under sandy soil and salt-alkali soil habitats in Songnen plain using observation in experimental plots and sampling in naturally-meadows.Propagation strategy and adaptation regulation of Leymus chinensis populations were investigated to understand the basics of grazing production.The quantity of vegetative propagation in two ecotypes of Leymus chinensis followed an increasing rule of power function y=axb(b represented a speed of population vegetative propagation).The coefficients of determination had significant differences.The speed-of-population vegetative propagation for two ecotypes of L.chinensis under salt-alkali soil habitat was higher than that under sandy soil habitat.The speed-of-population vegetative propagation for yellow-green ecotypes of L.chinensis was higher than that for grey-green ecotypes under either salt-alkali soil habitat or sandy soil habitat.Reproduction allocationⅠ,length of spike,percentage of reproduction growth and their variation coefficients for two ecotypes were higher under salt-alkali soil habitat than those under sandy soil habitat.There was a significant negative correlation between reproduction allocationⅠ and the percentages of vegetative organ weight.Therefore,habitat had effects on characteristics of sexual reproduction for two ecotypes of L.chinensis and there was negative correlation between sexual reproduction and vegetative growth.
【Fund】: 国家自然科学基金项目(30900117)(30770397)(30960261);; 呼伦贝尔生态系统国家野外科学观测实验站开放基金(201009);; 辽宁省教育厅科研项目计划(L2010149);; 沈阳市人才资源开发专项资金;; 辽宁大学“211工程”三期建设项目—现代生物技术与东北种质资源开发利用项目资助
【CateGory Index】: S543.9
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