摘要
从实生苗的出现和死亡情况研究了冷蒿 ( Artemisia communtata)小禾草群落的实生苗动态 ,发现实生苗出现时间和数量均受水分条件的制约。而不同植物的种子萌发特性不同是造成实生苗出现时间产生差异的主要原因。自然条件下由于水分的限制这种差异并不明显 ,浇水后显出规律性的变化 ,出现两个明显的高峰期。种子萌发后并不意味着完成了实生苗的补充 ,大部分实生苗会在各个阶段死亡。造成死亡的外因主要有三个 :干旱、竞争及家蓄和野生动物的采食、践踏。但在放牧条件下 ,实生苗死亡率的变化仍有较一致的趋势 ,即随着牧压增加实生苗死亡率增加。
The dynamics of seedlings were studied in the aspects of seedling emergence and mortality in the community of the Artemisia communtata-Short-grasses in typical steppe. The results showed that the quantities and the time of seedling emergences were restricted by soil moisture condition. The differences of the characteristics of seed germination may be the key reason resulting in the differences in the time of seedling emergences. Under the natural condition, the differences weren't distinct due to moisture s...
出处
《干旱区资源与环境》
CSSCI
CSCD
2001年第S1期106-111,共6页
Journal of Arid Land Resources and Environment
基金
"春季禁牧 (延迟放牧 )对提高畜牧业生产水平和保持草地可持续利用的试验示范"(中科院知识创新工程课题 KSCX1-0 8-0 1)
"锡林郭勒草地主要植物繁衍更新特性的研究"(中科院开放站基金 )资助。
关键词
冷蒿小禾草群落
实生苗
死亡率
Community of Artemisia communtata-Short-grasses
seedling emergence
mortality
