摘要
华山新麦草 (Psathyrostachys huashanica keng.)为我国特有种 ,仅分布在陕西华山。通过对自然种群传粉物候期观测发现 ,华山新麦草的传粉高峰期与海拔有一定关系。海拔每升高 2 0 0 m,传粉物候期就推迟 2～ 3d;海拔差异超过 5 0 0 m的亚种群 ,传粉物候期就不会出现重叠。同时应用等位酶分析技术和 E-统计分析间接估测华山新麦草自然种群的基因流 (N m) ,其值较一般风媒传粉植物低。通过华山新麦草资源状况、生长环境的调查以及移栽试验的观察 ,认为该物种稀有的主要原因之一可能是其生存竞争能力弱 ,最终被迫生长在其它物种所不能生存的环境。
Psathyrostachys huashanica Keng. is a Chinese endemic species whose distribution is restricted to Hua mountain in Shaanxi Province. Flowering phenology studies showed that the timing of peak pollination was related to altitude: flowering was delayed 2 to 3 days for every two hundred meters of elevation. Phenological periods did not overlap with differences between subpopulations of greater than 500 m. The Nm values estimated by E statistics are lower than those reported for other anemophytes. Judging from the results of this survey in combination with observations of the habitat of P. huashanica and transplant experiments, poor competitive ability may be one of the main causes in restricting the distribution of this species.
出处
《植物生态学报》
CAS
CSCD
北大核心
2001年第4期426-430,共5页
Chinese Journal of Plant Ecology
基金
国家自然科学基金资助课题 (39770 0 87)
关键词
华山新麦草
基因流
传粉物候期
等位酶
开花
Psathyrostachys huashanica Keng., Pollination phenology, Allozymes, Gene flow
