不同前茬作物下苜蓿地土壤杂草种子库的特征  

Characteristics of soil weed seed bank of alfalfa fields among different fore crops

作　　者：郭艳艳[1] 王建光[1] 孙启忠[2] 王清郦[3] 

机构地区：[1]内蒙古农业大学生态环境学院,内蒙古呼和浩特010019 [2]中国农业科学院草原研究所,内蒙古呼和浩特010010 [3]中国农业科学院研究生院,北京100081

出　　处：《草业科学》2012年第6期973-977,共5页Pratacultural Science

基　　金：现代农业产业技术体系(CARS-35)建设专项资金

摘　　要：为了探讨前茬作物对紫花苜蓿(Medicago sative)地杂草种子库的影响,采用诱萌法,于2010年在内蒙古林西县研究青贮玉米(Zea mays)、尖叶胡枝子(Lespedeza hedysaroides)和沙打旺(Astragalus huangheensis)3种前茬作物下生长第2年的紫花苜蓿地土壤杂草种子库的特征。结果表明,前茬为青贮玉米时苜蓿地杂草主要是马齿苋(Portulaca oleracea)和反枝苋(Amaranthus retroflexus),前茬为尖叶胡枝子时主要是马齿苋、刺藜(Che-nopodium aristatum)和反枝苋,前茬为沙打旺时主要是刺藜和反枝苋;前茬作物为尖叶胡枝子时,土壤杂草种子库的密度与其他两种前茬作物之间存在显著差异(P<0.05);土壤种子库杂草的种子主要集中在0～5cm的土壤耕作层,下层分布较少。To study the effects of fore crops on the characteristics of soil weed seed bank of alfalfa fields at second growing years, three different fore crops, which were Zea Mays, Lespedeza hedysaroides and Astragalus adsurgens, were designed by the inducing germination method. The results showed that, when the fore crop was Z. mays, the mainly weed of alfalfa field were Portulaca oleracea and Arnaranthus ret- roflexus; When the fore crop was L. hedysaroides, the mainly weed were P. olerecea, Chenopodiurn aristatum and A. retroflexus; When the fore crop was A. adsurgens, the mainly weed were C. aristatum and A. sretroflexus. Density of soil seed bank had significant difference between L. hedysaroides and the other two fore crops （P〈0.05） ; Weed seeds of the soil seed bank mainly concentrated in 0-5 cm soil lay-er and the distribution of deep level was very little.

关 键 词：紫花苜蓿 前茬作物 杂草 土壤种子库 

分 类 号：S451[农业科学—植物保护]