不同退化高寒草甸矮嵩草和高山嵩草无性系繁殖规律  

A Primary Study on Propagation Strategy of Kobresia pygmaea and Kobresia humilis under Different Degenerative Gradation in Alpine Meadow

作　　者：高新中 李希来[2] 马桂花[2] 马桂祥[2] 

机构地区：[1]山西省牧草工作站,山西太原030001 [2]青海大学农牧学院草业科学系,青海西宁810003

出　　处：《草业与畜牧》2008年第1期7-11,共5页Pruataculture & Animal Husbandry

基　　金：国家自然科学基金项目(39960053)资助

摘　　要：对不同退化高寒草甸矮嵩草和高山嵩草的繁殖对策进行了初步研究。结果表明,不同退化程度下两种嵩草都以营养繁殖为主扩大无性系繁殖后代,其中两种嵩草的芽分别占无性系小株数的比例最大;有性繁殖能力较弱。芽向一龄分蘖的转化率较高,各退化程度下矮嵩草平均分株内芽转化率达76%,高山嵩草达91%。两种嵩草无性系的扩大主要由二龄分蘖产生大量的营养芽来实现,芽通过一龄分蘖、二龄分蘖到生殖枝的转化率最低,其中矮嵩草无性系最多只有14%,高山嵩草最多只有5.7%。矮嵩草无性系分株生物量中根茎>叶>根,高山嵩草根茎>根>叶,地下生物量>地上生物量。The propagation strategy of Kobresia pygmaea and K.humilis under different degenerative gradation in Alpine Meadow were studied. The results showed that the clonal propagation ability of two species was stronger than sexual propagation in seed. The rate of buds among number of ramets per clone of K.pygmaea and K.humilis was maximal, and the sexual propagation ability were weak. The transformation rate of buds to tiller at age of one was high, the average transformation rate of K.humilis in different degenerative gradation was 76% and that of K.pygmaea was 91% .The vegetation buds that produced by tiller at age of two mostly enlarged clonal growth of two species, the transformation rate of buds to fertile tillers through tiller at age of one and two was minimum, its rate of K.b, umulis was mostly 14% and that of K. pygmaea was 5.7%. The sequence of ramet biomass per clone of K.humulis was： rhizomes〉leaves〉roots, and that of K. pygmaeas was： rhizomes〉roots〉leaves, their underground biomass were bigger than aboveground biomass.

关 键 词：退化程度 矮嵩草 高山嵩草 繁殖对策 

分 类 号：S792.411[农业科学—林木遗传育种]