太白红杉种群生殖对策研究Ⅰ生育力和种子重量

Studies on the reproductive strategy of Larix chinensisI fecundity and seed weight

研究了太白红杉种群生育力和种子重量与年龄及海拔的关系.结果表明:(1)南坡的太白红杉成熟年龄比北坡早.(2)太白红杉种群的生育力随着年龄的增大而增大,但到一定年龄后又呈下降趋势,南坡太白红杉在70龄左右时生育力开始降低,北坡太白红杉在90龄左右生育力下降;北坡太白红杉种群的生育力随海拔的升高逐渐增大,大约到海拔3300 m左有后逐渐降低;南坡太白红杉种群的生育力则一直随海拔升高而逐渐增大.(3)太白红杉种子的重量(千粒重)随着个体年龄的增大逐渐增加,但南坡在60龄左右时又逐渐变轻;种子重量随海拔的升高表现为先增加,后下降的趋势,但在北坡种子重量开始下降的海拔要比南坡低.

The relationship between the fecundity, seed weight of Larix chinensis and their age and altitude were studied in this paper. The result showed that (1) The age of maturation of Larix chinensis in the southern slope was younger than in the northern slope. (2) The fecundity increased with the age while declined at the age of 70 years in the southern slope and 90 years in the northern slope. It also increased with the altitude, but in the northern slope it was beginning to decline at about 3 300 m. (3) The seed weight became bigger with the increase of age but became smaller in the southern slope after 60 years old. With the increase in altitude, the seed weights become bigger at first and then smaller, but it became smaller at a lower altitude in the northern slope.