Modular growth and clonal propagation of Hippophae rhamnoides subsp, sinensis in response to irrigation intensity

查看全文 作　　者：Zilin [1,2]Cao;Tianjiang [3]Li;Genqian [2]Li;Chunhong [4]Liu;Haiyin [4]Gao;Guanghui [1]Dai;Zhiyong [5]Xiao;Sunling [3]Li

机构地区：[1]Beijing Forestry University, Beijing 100083, People's Republic of China;[2]Southwest Forestry University, Kunming 650224, People's Republic of China;[3]Yunan Academy of Forestry, Kunming 650204, People's Republic of China;[4]Dingbian County Forestry Station, Dingbian 718600 People's Republic of China;[5]Yichun Research Institute of Forestry, Yichun 336000,People's Republic of China

出　　处：《Journal of Forestry Research》索引2016年第27卷第5期,共10页

基　　金：supported by the National Science Foundation of China(31070551/31570609) 摘　　要：A multipurpose clone plant species,Hippophae rhamniodes has the capacity for indefinite longevity,although under successive drought stress it may often decline or die across large areas.Field trials were conducted over 2 years to examine the effects of varied irrigation intensities on modular growth and clonal propagation in a semi-arid area.Irrigation levels included a control,as well as two,four and six times the volume of water that was typically received via local annual average precipitation.Irrigation intensity significantly influenced clonal propagation capacity(number of daughter ramets),aboveground modular growth(height,base diameter,and crown width),belowground modular growth included root nodule dry weight,stretching capacity of lateral roots(length of the longest lateral roots,and diameter of firstgrade lateral roots),and branching intensity of lateral roots(number of lateral roots bifurcation grade,number of firstgrade lateral roots).The modular growth and the density of daughter ramets were small under non-irrigation or low irrigation,and became larger with increased irrigation intensity.Beyond a certain threshold,however,further increases in irrigation intensity resulted in a reversion to the development.The optimal irrigation intensities for growth and propagation were 3.48–5.29 times the volume of nominal local annual average precipitation.There were effects of irrigation intensities on the positive significant correlations between aboveground and belowground modular growths,and on clonal propagation capacities.Under various water treatments,H.rhamnoides may adapt to the environment through the regulation of growth and propagation.We concluded that water shortages act to weaken the growth and propagation of H.rhamniodes plantations. 关键词：灌溉水平构件生长繁殖能力反应强度模块化沙棘年平均降水量半干旱地区

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Modular growth and clonal propagation of Hippophae rhamnoides subsp, sinensis in response to irrigation intensity

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