不同土壤水分条件下中国沙棘克隆生长的对比研究

A comparison study on the clonal growth of Hippophae rhamniodes L. subsp. sinensis at different soil moisture condition

通过不同土壤水分条件下中国沙棘克隆生长特征和形态特征的对比研究,期望揭示其克隆生长调节对策.结果表明:①土壤水分有效性高的种群,其子株密度和生物量大于土壤水分有效性低的种群.②土壤水分有效性高,种群的个体大、单轴型个体多;土壤水分有效性低,种群的个体小、合轴型个体多.③土壤水分有效性高,种群地上生物量所占比例大,地下生物量主要投资于克隆器官的生长;土壤水分有效性低,种群地下生物量所占比例大,地下生物量主要投资于根系的生长.④土壤水分有效性高,种群增长率大、高度级多、产生克隆子株早;土壤水分有效性低,种群增长率小、高度级少、产生克隆子株晚.

In expectations of expounding the strategies of clonal growth regulation, clonal growth plasticity of Hippophae rhamniodes L. subsp, sinensis clone population at different soil moisture content were studied. The results were as follows; （ 1 ） The ramets density and population biomass at high level of soil moisture supply were higher than that of the population at low level of soil moisture supply. （2） The ramet size and the index of clonal growth form of the population at high level of soil moisture supply were higher than that of the population at low level of soil moisture supply. （3） At high level of soil moisture supply, the percentage of aboveground biomass was higher and underground biomass mainly invested to the growth of clonal module. At low level of soil moisture supply, the percentage of underground biomass got more and underground biomass mainly invested to the growth of roots. （4） At high level of soil moisture supply, population growth rate and the number of height classes were higher, and the daughter ramets came from elonal growth appeared early. At low level of soil moisture supply, population growth rate and the number of height classes were less, and the daughter ramets came from clonal growth appeared late.