无芒隐子草种子萌发、出苗和幼苗生长对土壤水分的响应  

Responses of seed germination,seedling emergence and seedling growth in Cleistogenes songorica to soil water content

作　　者：邰建辉[1] 王彦荣[1] 陈谷[2] 

机构地区：[1]兰州大学草地农业科技学院,甘肃兰州730020 [2]百绿集团,北京100025

出　　处：《草业学报》2008年第3期105-110,共6页Acta Prataculturae Sinica

基　　金：国家重点研究发展计划(973计划)项目“中国西部牧草、乡土草遗传及选育的基础研究”项目课题(2007CB108904)资助

摘　　要：研究了无芒隐子草种子萌发、出苗和幼苗生长对土壤含水量的响应。结果表明，在1％～20％土壤含水量条件下，沙质土壤中种子室内萌发和户外盆栽出苗的最适土壤含水量均为6％～8％。种子室内萌发率和萌发指数最高值分别为64．0％和16．6；户外盆栽的出茁率、成活率和出苗指数最高值分别为33．5％，29．5％和6．6。盆栽幼苗的最适生长土壤含水量为8％（幼苗生物量最大）；在3％～20％土壤含水量间，随含水量增加植株将更多的能量用于地上部分生长。Responses of seed germination, seedling emergence and seedling growth in Cleistengenes songorica under different soil water content （1%, 2%, 3%, 4%, 6%, 8%, 12%, 16% and 20%）were studied. Results showed that the optimal soil water content for C. songorica＇s seed germination and seedling emergence in sand were 6%-8%. The highest germination percentage and germination index were 64.0% and 16.6 in laboratory incubator experiment. While the highest percentages of emergence, survived seedlings and emergence index from the outdoor pot experiment were 33.5%, 29.5% and 6.6, respectively. Optimal soil water content for seedling growth in the pot experiment was 8% in which yielded the highest seedling biomass. As the soil water increased from 3% to 20%, the seedling allocated more biomass to the shoots.

关 键 词：无芒隐子草 种子萌发 种子出苗 幼苗生长 土壤含水量 

分 类 号：S543.9[农业科学—作物学]