松嫩平原碱化草甸獐毛种群有性生殖的数量特征及营养繁殖特性的研究

Srudies on Quantitative Characters of Sexual Reproduction and Specifity of Vegetative Propagation of Aeluropus littoralis var, sinensis Population in Songnen Plain of China

通过对单优群落随机取样的调查与测定，分析了松嫩平原碱化草甸漳毛种群有性生殖的数量特征及营养繁殖特性。樟毛种群以营养生长和营养繁殖为主，成穗率仅为１５．７％，结实率为４１．６％。獐毛的匍匐茎在整个生长季均不断地增节伸长。至生长季末期，大多数匍匐茎可产生２０～２２个节，总长度可达２６９．５～３０４．５ｃｍ，节上可共产生８５．５～ｌ１１．４个营养繁殖株。不同月份的匍匐茎，其营养繁殖具有相同的规律性。匍匐茎的营养繁殖株在翌春存活与繁殖的数量最少者为１０株，多者达１３１株，基部１～２节无存活，３～１９节可形成１～２３株的营养繁殖株丛，最远存活的节营养繁殖株距母株２９４ｍ。

Through investigation and calculation by random samplmg in the singsle dominant Community, quantita-tive characters of sexual reproduction and specifity of vegetative propagation,the Aeluropus littoralis var sinen-sis population in the alkalized meadow of the Songnen Plain Area,Nor theast China was analyzed in the pa-per,In the said population both the vegetative growth and propagation conditions in detail have been studi-ed in the main,but the rate of earing was only l5.7%,and that of seed-setting percentage was 41.6%。The nOdes were continuously developing throughout from the end of the creeping stem to stretch in lengthand grow more in number.The great majority of creeping stems could produce 20 to 22 nodes,of which thetotal length would reach as much as 269.5 to 3 04.5 cm,and in every node,there were a total number of85.5 to 111.4 vegetative propagating plants be produced till the end of growth season.The creeping stems,though stretching out in different months, however,their specifity of vegetative propagation would possessmuch the same pattern of regularity. In the spring of the next year after seeding,the vegetative propagatin gplants along with those of survivals,in which the numbers were very great in disparity,varying from 40,theleast,to l31,the greatest;but in the basal part of stem,from the first to the second nodes,not any one wasin survival,and then all the other nodes,from the third enumerated till the l9th,there were 1 to 23 plants ofvegetatively propagated be formed from the basal tufts,among them,the farthest survived nodes also thosestretching out from the stems,were 294cm away from the maternal plant in our trial.