关键词: 一年生植物, 繁殖分配, 繁殖对策

Abstract: A field experiment on the reproductive allocation of the annual plant Eragrostis poaeoides was carried out in the re-vegetated areas in Shapotou of the Tengger Desert. The results reflected that for both the population and individual, the annual plant Eragrostis poaeoides has the different individual size and the reproductive size in re-vegetated areas with various time-duration from establishing, which may be listed as the sampling sites of 1956196419811987; so did its sexual propagation, the size may also be listed as the sampling sites of 1956 > 1964 > 1981 > 1987, even the contribution rate of Eragrostis poaeoides to propagation was 70.17% 6.24% in site re-vegetated at 1956, far higher than 59.18% 8.75% of 1987 site; the aboveground biomass, stem weight, leaf number and weight almost had no difference in the four sites, which suggested that they were controlled by other factors besides by the fixation duration. The living conditions were improved with the increase of the stabilization duration. Hence, the annual plant will convert more resources and energy into reproduction activities, so as to increase the population size. In contrast, for the newly stabilized sand dune, the annual plant will consume more resource and energy for nutrition development in order to cope with the harsh environment.

Key words: annual plant, reproductive allocation, reproductive strategy