摘要
采集来自腾格里沙漠的黄花补血草种子,分别设置7个水分梯度（3.0%,5.0%,8.0%,10.0%,15.0%,18.0%,20%）和6个播种深度（0、0.5、1.0、1.5、2.0、2.5 cm）,进行黑暗（10~15℃）和光照（20~25℃）处理,研究水分、埋藏深度和温度对黄花补血草种子萌发和出苗的影响。结果表明：黄花补血草种子吸涨速率很快,在6 h种子吸水达到饱和;在土壤水分为3.0%~10.0%时,种子萌发率较高,当土壤水分达到20%时,萌发受到抑制;种子埋藏越深,萌发率越低,土壤水分太低或者太高,都不利于种子萌发。黄花补血草种子萌发和幼苗生长的最佳条件是：白天温度在25℃,夜间温度在15℃,土壤水分为10.0%,埋藏深度为0.5 cm时种子萌发率和出苗率最高。
Effects of burying depth, soil moisture and temperature on seedling establishment of Limonium aureum （L） Hill were studied. The seeds were collected from the Tengger Desert, the experiment was carried out under treatments of seven water grades, i.e. 3.0%, 5.0%, 8.0%, 10.0%, 15.0%, 18.0%, 20%, six burying depths at 0, 0.5, 1.0, 1.5, 2.0, 2.5 cm, and two temperature conditions in nighttime （10-15℃ ）and daytime （20-25 ℃ ）. The imbibition of the L. aureum seeds was fast, with the speed of absorbing water reached the maximum in 1 hour, and the seeds became saturated in 6 hours. The percentage of seedling emergence was higher with soil moisture content from 3.0 % to 10.0 %, and at relatively shallower burying depth. Seedling emergence was checked and recorded everyday, moisture was added every 24 hours. The experiment was terminated after 21 days when the seedling emergence became almost steady. In the experiment, no seedlings emerged from seeds location at the depth of 2.5 cm. The deeper the seeds were placed in soil, the lower and slower were their emergences. Too much or insufficient moisture, too deep of burial depth reduced the percentage of seedlings emergences, which reflected the adaptation of the plant to the local climate and environment. Considering the habitat conditions, the optimal environment of seedling emergence is： temperature at 25℃（daytime）/15℃ （nighttime）, soil moisture of 10.0%, and the burial depth within 0.5 cm.
出处
《中国沙漠》
CSCD
北大核心
2009年第3期529-535,共7页
Journal of Desert Research
基金
国家自然科学基金(30670319)
甘肃省科技支撑计划基金(0804NKCA075)
甘肃省教育厅科研基地重点项目计划基金(08-zd-14)
兰州市科技发展计划(2008-1-169)共同资助
关键词
黄花补血草
土壤水分
沙埋深度
种子萌发
Limonium aureum （L.） Hill
burial depth
soil moisture
seedling emergence
