川西泡沙参种群地上生物量生长发育的研究

Aboveground biomass growth development of Adenophora potaninii populations in West Sichuan Province

对川西泡沙参种群地上各器官，茎、叶、花－果的生物量生长发育过程进行了系统的研究，结果表明：（１）泡沙参种群（总和）个体地上总生物量和各器官的生长发育在１－５年生生长缓慢，５－１５年生随年龄增长，年生物量增幅较大，此后，生长速度开始下降，直到死亡年龄。泡沙参种群（总和）地上生物量生长发育过程可用方程ｙ＝ａ０＋ａ１ｘ＋ａ２ｘ２表示。（２）不同海拔区间的泡沙参种群个体地上总生物量和各器官生物量生长发育与种群（总和）地上总生物量生长发育的趋势基本一致，生物量生长在幼年和老年时较低，大约在１５年生时达到高峰。（３）不同海拔区域综合生境条件与种群的地上生物量生长、生长模式、生物量最高峰出现的年龄区段等有着密切联系。在较为适生的环境条件下，外界干扰少，水热条件适宜，种群各器官的生物量和个体总生物量可达到较高水平。在低海拔地区，外界干扰严重，或高海拔地区，低温条件严酷，个体总生物量和各器官生物量均较低。

Growth development courses of aboveground total biomass as well as stem,leave,flower fruit biomass of Adenophora potaninii Korask.populations in different altitudes have been studied systematically.The results showed that: (1) The aboveground total biomass growth development of the whole population is slow during 1-5 years old,and then,increases with the age until 15 years old,after that,goes down until dead age.The biomass growth development courses with age could be expressed by the equation: y=a 0+a 1x+a 2x 2 .(2) The aboveground biomass growth development tendency,both the total and each organ,of different populations at different altitudes is similar to the whole population,in which the growth speeds are slower during the young ages or old ages,and higher during 15 years old.(3) Under the favorable water and temperature environmental conditions with less disturbance at middle altitudes,the population biomass can achieve the higher level.In the harsh habitat,such as strong external disturbance at lower altitude or lower temperature at higher altitude,population biomass only maintains the lower level.The comprehensive habitat condition is closely connected with the biomass growth,growth pattern of each organ and the peak period of biomass growth of the different populations.