无芒隐子草种子萌发、出苗和幼苗生长对土壤水分的响应

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;户外盆栽的出苗率、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 Cleistogenes songorica to soil water content

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.