【作者】 常杰； 葛滢； 陆大根； 陈启；

【Author】 Chang Jie Ge Ying Lu Dagen Chen Qichang (Department of Biology and Biotechnology.Hangzhou University,Hangzhou 310012)

【机构】 杭州大学生物科学与技术系；

【摘要】 两年的研究表明,杭州石荠苎(Mosla hangchowensis)的种子萌发率为4.8%,幼苗成长率在2.8%—18.4%之间,均低于大多数一年生植物.其存活曲线接近Deevey 2型,在整个生活过程中始终有较大的死亡危险,其中在苗期和开花前期有两个明显的环境筛,致死因素分别是生存空间竞争和夏季的高温、干旱.3种生境又各有特点,林下生境中的植株因光照不足不能完成生活史,开阔地生境日干旱死亡率较大,林缘生境存活率最大.在大旱年,林缘生境表现为在较厚土壤上生长的植株存活率较高.更多还原

【Abstract】 The results of two year study showed that the germination rate of Mosla hangthowensis wasonly 4.8%, the establishing rates were between 2.8%and 18.4%,those were lower than most of other annual plants.The survivorship curve was close to the Deevey 2.The posabihties ofdeatli were higher throughout the living process,and there were two evident environmenal sieves before reaching flowering peroid.The factors causing death in environmental sieves were the competition for space,the high temperature and drought stress respecively,There were different charaoters among the three habitats:The rate of servivorship by-forest was the highest,the individuals under forest could not complete their life history because of lack of the sunlight,and there was high rate of death of the individuals on open land caused by drought.In serious drought year,the rate of survivorship of plants on think soil was higher than that on thin soil in the byforest habitat.更多还原