生境土壤氮素资源异质性格局对于克隆植物结缕草生长的影响(英文)  

Impacts of soil nutrient heterogeneity pattern on the growth of clonal plant of Zoysia japonica

作　　者：李德志[1] 伊东睦泰 祝廷成[3] 

机构地区：[1]华东师范大学环境科学系,上海200062 [2]日本国立新泻大学 [3]东北师范大学草地研究所,吉林长春130024

出　　处：《草业学报》2006年第4期136-141,共6页Acta Prataculturae Sinica

基　　金：国家自然科学基金项目(30370245,30470288);国家"十五","211"工程华东师范大学重点学科项目;上海市生态学重点学科项目资助

摘　　要：通过试验分析了生境土壤氮素异质性对于克隆植物结缕草生长的影响。结果表明,生境中土壤氮素资源的总体水平、分布格局以及二者间的相互作用均显著影响结缕草克隆的干物质生产量。试验证明,当土壤氮素资源的总体水平较低时,氮素资源的异质性分布对结缕草的生长有利;而当土壤氮素资源的总体水平较高时,结缕草在同质生境中的干物质生产量较高。在异质生境中,肥沃土壤带距离初始的结缕草分株的位置,也对结缕草的生产量产生影响。当结缕草克隆能够较早地从试验生境的肥沃土壤带中获取丰富的氮素资源时,其干物质生产量倾向于增加。An experimental study was carried out to analyze the impacts of soil nitrogen heterogeneity on the growth of a clonal plant, Zoysia japonica. The total soil nitrogen supply in the habitats, its distribution and the interactions between the two factors all significantly influenced dry matter productions of Z. japonica clones. Z. japonica clonal production benefited from heterogeneous nitrogen distributions when the total soil nitrogen supplies in the habitats were relatively low. When the total soil nitrogen was relatively high, clonal production was substantially higher in homogeneous treatments. In heterogeneous habitats, the positions of fertile soil bands relative to the initial position of the Z. japonica ramets affected clonal production. When Z. japonica clones acquired abundant nitrogen from fertile soil bands earlier, their dry matter production was increased.

关 键 词：克隆生长 异质性格局 土壤氮素 结缕草 

分 类 号：S688.4[农业科学—观赏园艺]