4种牧草不同生长期C、N生态化学计量特征  

Carbon and nitrogen stoichiometry at different growth stages in legumes and grasses

作　　者：王冬梅[1] 杨惠敏[1] 

机构地区：[1]兰州大学草地农业科技学院农业部草地农业生态系统学重点开放实验室,甘肃兰州730020

出　　处：《草业科学》2011年第6期921-925,共5页Pratacultural Science

基　　金：973计划课题(2007CB106804);甘肃省自然科学研究基金(096RJZA057);中央高校基本科研业务费专项资金(lzujbky-2010-5)

摘　　要：在甘肃庆阳(降水量517 mm)和榆中(降水量350 mm)的大田栽培条件下,研究了3种豆科牧草陇东苜蓿(Medicago sativacv.Longdong)、红豆草(Onobrychis viciaefolia)和箭筈豌豆(Vicia sativa)以及1种禾本科牧草一年生黑麦草(Lolium multiflorum)主要生长期的C、N含量及计量比变化。结果表明,不同生长期牧草有机碳含量差异不大;全氮含量随生长期呈降低趋势或在孕穗(蕾)期较低,叶全氮含量高于茎和根;C/N随生长期呈增加趋势或在孕穗(蕾)期较高,叶C/N低于茎和根,禾本科牧草C/N高于豆科牧草。榆中一年生黑麦草C/N高于庆阳,而豆科则相反。牧草C/N随生长期的变化与不同植物不同阶段C同化和N吸收有关。This study was aimed to investigate carbon and nitrogen stoichiometry at different stages in legumes and grasses by comparing 4 different species under a field trial.For the content of organic carbon（OC）,it changed little at different growth stages.Total nitrogen（TN） content showed a decreasing tendency with growth stage or was less at the booting stage.Leaf TN content was greater than those in stem and root.With the changes in OC and TN contents,C/N showed an increasing tendency with growth stage or was greater at the booting stage.Leaf C/N was less than those in stem and root,and grass C/N was greater than that in legume.C/N of annual ryegrass in Yuzhong site was greater than that in Qingyang,while for legumes,it was less.The results suggested that the change in C/N with growth stage is closely correlated with carbon assimilation and nitrogen absorption of plants at different growth stages.

关 键 词：牧草 生长期 碳含量 氮含量 计量比 

分 类 号：S54[农业科学—作物学]