摘要
研究了濒危植物明党参 (Changiumsmyrnioides)与非濒危种峨参 (Anthriscussylvestris)种子贮存、打破休眠和萌发对水分和温度条件的要求。结果表明 ,在自然条件下 ,明党参种子有 5个月的休眠期 ,人工低温 (10℃左右 )处理 4 0天即可打破休眠 ;两种植物种子自然温度干燥处理不能打破休眠 ;两种植物的种子在自然温度变湿层积处理后萌发率最高 ,萌发持续时间也最长 ,其中明党参的萌发率高于峨参 ,持续时间短于峨参 ;自然温度淹水处理大大降低了两种植物种子的萌发率 ,但明党参仍有 7%的萌发率。明党参种子质量和发芽率不应是明党参濒危的直接原因 ,但因其具有种子产量低、幼苗数量少、存活率高的K 对策 ,当受到强烈干扰时 ,种群难以在短期内恢复 ,容易濒危。
The dormancy and germination of seeds of an endangered species, Changium smyrnioides, and another non endangered species, Anthriscus sylvestris , were studied under different storage conditions. The results showed that in natural condition, the seeds of C. smyrnioides had a dormancy stage for about five months, and that experimental low temperature (about 10℃) could break dormancy after 40 days of treatment. Seeds stored under natural temperature and dry condition could not break dormancy, while those stored under natural temperature and fluctuant moisture condition had the highest germination ratio, and their germination ability lasted for a longer time than any other treatments. The germination ratio of C. smyrnioides was higher than that of A. sylvestris, while the germination duration was shorter. Germination of seeds stored under natural temperature and saturated moisture conditions decreased markedly in both species, although in C. smyrnioides the germination could remain at 7%. Apparently, the quality and germination ability of seeds of C. smyrnioides is not the direct reason for its endangerment. The species follows a K strategy, with the characteristics of a big seed grain, lower seed production, and few seedlings created. As a result, the population cannot be restored quickly when disturbed intensively and the species has a greater possibility of endangerment.
出处
《生物多样性》
CAS
CSCD
2002年第4期425-430,共6页
Biodiversity Science
基金
国家重点基础研究规划项目 (G2 0 0 0 0 4680 5 )
