摘要
差巴嘎蒿(Artemisia halodendron)是科尔沁沙地植被的关键种之一,它在沙地植被的恢复演替过程中扮演着重要角色,也被广泛应用于人工固沙活动中。为了了解差巴嘎蒿对风沙环境的适应特点,试验研究了其种子萌发对土壤温度、水分和埋藏深度的响应模式。结果表明:差巴嘎蒿种子在4月和5月的土壤温度条件下萌发良好,总萌发率可达到96%,在7月的土壤温度条件下萌发较差,总萌发率低于50%;若以试验前3天的总萌发率为准,则5月的萌发率远大于其它两个月。在0MPa、-0.1MPa、-0.2MPa、-0.4MPa、-0.8MPa和-1.6MPa水势下,差蒿种子的总萌发率分别为89%、83%、80%、46%、17%和0%。在0.5cm、1.0cm和2.0cm埋深下,最终出苗率分别为90%、32%和9%,当埋深大于4cm后,种子无法出苗。种子萌发对温度、水势和埋深的这种响应模式总体上不利于差巴嘎蒿实生苗在科尔沁沙丘生境中的存活。
We experimentally investigated the effects of temperature and water potential on seed germination, and burial depth on seedling emergence of Artemisia halodendron which is a dominant plant on semi - fixed sand dunes and is widely planted to fix the moving sand dunes in the Horqin Sandy Land of Inner Mongolia, China. The results showed that ： 1） the seeds germinated well finally at the temperatures of April and May, but poorly at that of July ; the germination speed at the temperature of May was the highest. 2 ） In water potential of 0MPa, - 0. IMPa, -0.2MPa, -0.4MPa, -0.8MPa and - 1.6MPa, the total percent germination were 89% , 83% , 80% , 46% , 17% and 0% , respectively. 3） The total percent emergence of seeds buried at 0.5cm, 1.0cm and 2.0cm were 90% , 32% and 9% , respectively. When the depth was over 4cm, there was no seedling emerged. These results are discussed with regard to the adaptation of A. halodendron to a moving or semi - moving sand dune in Horqin Sandy Land.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第9期151-154,共4页
Journal of Arid Land Resources and Environment
基金
国家"十一五"科技支撑计划项目(2006BAD26B0201
2006BAC01A12)资助
关键词
差巴嘎蒿
种子萌发
温度
水势
埋深
Anemisia halodendron
seed germination
temperature
water potential
burial depth
